bar cutting machine

Abstract

The present invention provides a feeding device capable of supplying even short rods, such as those used as rear end pieces, to a cutting machine, and a rod cutting machine equipped with such a feeding device. [Solution] With the opening width W2 of the opening 120 of the feeding vise 18 smaller than the diameter W1 of the end material 23, the end material 23 is moved to the upper part of the feeding vise 18 by the lifting part 114, so that the end material 23 is supported at the upper end of the opening 120. Subsequently, the opening width W2 of the opening 120 of the feeding vise 18 is gradually increased, and the end material 23 gradually descends accordingly. This makes it possible to minimize the height at which the end material 23 falls toward the second roller 85 when the opening width W2 of the opening 120 of the feeding vise 18 becomes larger than the diameter W1 of the end material 23, thereby reducing the impact on the feeding vise 18.

Description

Technical Field

[0006] , ,

[0005] , , , ,

[0001] The present invention relates to a bar cutting machine that feeds a bar of a longitudinal shape such as a round bar, a pipe, or a shaped bar to a bar cutting mechanism in order to cut the bar, and relates to a technique for shortening the rear end material of the bar.

Background Art

[0002] There is known a bar cutting machine including a feeding device that feeds a bar in the axial direction by a predetermined cutting length while gripping the bar with a feeding vise, and a cutting machine that grips the fed bar with a main vise straddling both sides of a circular saw and cuts the bar perpendicular to the axis using the circular saw. Such a bar cutting machine repeats a process of feeding the bar by a predetermined length dimension (cutting length) by the feeding device and then cutting it with a thin circular saw provided in the cutting machine, thereby cutting a single bar into a plurality of parts of the cutting length. When the remaining length of the cut of a single bar becomes shorter than a predetermined value, it is sorted separately from the product as a rear end material and discarded.

[0003] Regarding the generation of such a rear end material, in Patent Document 1, a technique is disclosed for making the size of the generated rear end material as small as possible by making the inlet vise and the feed side vise of the main vise operable integrally.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in Patent Document 1, there are problems such as the need to make the main vise and the feed side vise have corresponding shapes and control their movements, which complicates the mechanism.

[0006] Furthermore, as a method for utilizing the resulting rear end scraps, a technique has been considered in which the scraps are inserted from the discharge side of the cut steel material and clamped in a feeding vise, and then cut further to the desired length, thereby minimizing the amount of scrap material generated. However, this technique requires an additional mechanism on the discharge side of the cutting device to insert the rear end scraps, which leads to challenges such as the device becoming larger and consequently increasing the overall cost of the device.

[0007] The present invention was made against the above circumstances, and its objective is to provide a bar cutting machine having a supply mechanism capable of supplying scrap material generated by the cutting machine to a feeding device. [Means for solving the problem]

[0008] The gist of the present invention for achieving the above objective is a bar cutting machine comprising: (a) a feeding device having a feeding vise that is reciprocally driven along the longitudinal direction of a bar and feeds the bar toward a cutting position by predetermined cutting lengths; a cutting device that cuts the bar perpendicular to the axial direction of the bar; and a supply device that supplies the bar to the feeding vise, wherein (b) the supply device includes a supply unit that aligns a plurality of the bar materials in a parallel direction toward a preset supply standby position, and a transfer unit that moves one of the plurality of bar materials that has reached the supply standby position above the feeding vise, and (c) when the lifting unit transfers the bar material above the feeding vise, the feeding vise is characterized in that the opening width of the opening of the feeding vise is smaller than the diameter of the bar material, and the opening width is gradually increased after the bar material is positioned in the opening. [Effects of the Invention]

[0009] According to the bar cutting machine of the present invention, the bar is moved to the upper part of the feeding vise by the lifting part when the opening width of the feeding vise is smaller than the diameter of the bar, so that the bar is supported at the upper end of the opening. Subsequently, the opening width of the feeding vise is gradually increased, and the bar gradually descends accordingly, so that the height at which the bar falls when the opening width of the feeding vise becomes larger than the diameter of the bar can be made as small as possible, and the impact on the feeding vise can be reduced.

[0010] Preferably, (d) the transfer section is provided adjacent to the feeding vise, and (e) the upper surface of the transfer section has an inclined surface that slopes downward as it faces the feeding vise. This allows the rod to roll toward the feeding vise on the inclined surface which is the upper surface of the transfer section.

[0011] Preferably, the supply device also includes a second transfer means for supplying elongated rods, which are longer than the rods that the transfer unit can transfer, to the feeding position. By having both the transfer unit and the second transfer means, relatively short rods that are difficult to supply by the second transfer means can be supplied by the supply device. [Brief explanation of the drawing]

[0012] [Figure 1] This is a front view showing the main part of a bar cutting machine, which is one embodiment of the present invention. [Figure 2] Figure 1 is a plan view of a part of the bar material feeding device in the bar material cutting machine, with the cover removed, as seen from the direction indicated by arrow II. [Figure 3] Figure 1 is a front view showing a part of the bar material feeding device in the bar material cutting machine with the cover removed. [Figure 4] This diagram illustrates the supply of bar material by the bar material supply device in the bar material cutting machine shown in Figure 1, and is a view from direction IV in Figure 3. [Figure 5] Figure 1 is a side view of the bar cutting machine with its cover removed, seen from the direction indicated by arrow V. [Figure 6] This is a view of a part of the feeding device in the bar cutting machine shown in Figure 1, from the direction VI in Figure 2, which is perpendicular to the feeding direction. [Figure 7] Figure 6 is a cross-sectional view of the feed vise in the bar cutting machine shown in Figure 1, viewed from direction VII. [Figure 8] This diagram illustrates the supply of scrap material by the scrap material supply device in the bar cutting machine shown in Figure 1, and is a view from direction VIII in Figure 3. [Modes for carrying out the invention] [Examples]

[0013] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0014] Figure 1 is a front view showing a bar cutting machine 10, which is one embodiment of the present invention. As shown in Figure 1, the bar cutting machine 10 consists of a main body 12 equipped with a feeding vise 18 (see Figure 7, etc.) that grips a portion of a bar 22 (see Figure 5, etc.), which is a metal material to be cut such as round steel, square steel, or steel pipe, a feeding device 16 that feeds the bar 22 gripped by the feeding vise 18 in predetermined cutting lengths in the axial direction, and a cutting device 20 that cuts the bar 22 at the cut length, and a bar supply device 14 that holds a plurality of bar 22 and supplies each bar 22 to a position where they can be gripped one by one by the feeding vise 18, i.e., to a feeding position A of the feeding device 16 that feeds the bar 22 in predetermined cutting lengths in the axial direction.

[0015] FIG. 2 is a plan view seen from the direction indicated by arrow II in FIG. 1, and FIG. 3 is a view showing an enlarged view of the bar supply device 14 with the covers 10a and 10b of the bar cutting machine 10 in FIG. 1 removed, and is a view seen from the direction indicated by arrow III in FIG. 2. As shown in detail in FIGS. 2 and 3, the bar supply device 14 includes a plurality of supply rails 26 for rolling the bar 22 (the bar 22 shown by the two-dot chain line in FIG. 4) placed on the bar supply device 14 to the supply standby position B (see FIG. 4). The plurality of supply rails 26 are parallel to each other and are inclined so that they become lower in the vertical direction as they approach the supply standby position B. Thereby, the bar 22 placed on the supply rail 26 rolls to the supply standby position B by gravity and is stopped at the supply standby position B by a stopper member 30 described later. In FIGS. 2 and 3, the cutting device 20 side of the bar supply device 14 is shown, but the same mechanism is provided in the omitted part as well. The bar supply device 14 corresponds to the second transfer means of the present invention.

[0016] As shown in FIG. 3, the bar supply device 14 is provided with a hydraulic cylinder 50. The hydraulic cylinder 50 is fixedly provided on the base 24 and operates by the hydraulic pressure supplied from a hydraulic supply device not shown. The hydraulic pressure supplied by the hydraulic supply device is controlled by a hydraulic control device not shown. A rod 51 is connected to the hydraulic cylinder 50, and the reciprocating motion of the hydraulic cylinder 50 is transmitted to a transmission member 52. The transmission member 52 is connected to a plurality of link members 53, and each link member 53 is rotatable at the connection portion with the transmission member 52. The link member 53 is also connected to the spring plate 42. On the other hand, the spring plate 42 is made rotatable about a rotation shaft 43 spanned between a pair of beams 25 provided in the conveying direction (length direction) of the bar 22 in the base 24. By these mechanisms, the linear reciprocating motion of the hydraulic cylinder 50 is converted into a reciprocating rotational motion in the rotational direction about the rotation shaft 43 of the spring plate 42.

[0017] Furthermore, the bar material feeding device 14 is equipped with guide rollers 34 and 35. These guide rollers 34 and 35 guide the bar material 22 when it is moved by the feeding vise 18 after being positioned at feeding position A. The dashed line in Figure 2 indicates the position where the circular saw 94 of the cutting device makes contact when the bar material 22, positioned at feeding position A, is fed into the cutting device 20.

[0018] Figure 4 illustrates how the bar material 22 is supplied from the supply standby position B to the feeding position A in the bar material supply device 14. In the bar material supply device 14, a stopper member 30 is provided at the end of the supply rail 26 on the supply standby position B side, so as to be connected to the supply rail 26. The stopper member 30 is made of a plate material having a concave shape. The lower part of the end face 31 of the stopper member 30 on the supply rail 26 side is in contact with the supply rail 26, while the upper part rises up from the supply rail 26. This stops the bar material 22 rolling along the supply rail 26 at the supply standby position B.

[0019] Using FIG. 4, the operation of supplying the bar 22 from the supply standby position B to the feeding position A in the bar supply device 14 will be described. First, as described above, the bar 22 at the supply standby position B is stopped by the end face 31 of the stopper member 30 at the lower end (the left end in FIG. 4) of the supply rail 26. On the other hand, the spring plate 40 is in a horizontal state. Subsequently, when the hydraulic cylinder 50 is operated in the direction of pulling in the rod 51, the spring plate 40 rotates about the rotation shaft 43 in the rising direction. At this time, the right end portion 42 of the spring plate 40 extends to the right side beyond the position where the bar 22 at the supply standby position B in FIG. 4 contacts the supply rail 26. Therefore, as the spring plate 40 rises, the bar 22 at the supply standby position B is lifted from the supply rail 26 by the spring plate 40. At this time, the upper surface 41 of the spring plate 40 is inclined downward toward the feeding position A, similar to the supply rail 26, in the state where the spring plate 40 has risen. Therefore, the bar 22 lifted from the supply rail is lifted while being supported by the end face 31 of the stopper member 30 at first. Then, as the spring plate 40 rises and the bar 22 is lifted beyond the end face 31 (position B1 in FIG. 4), the bar 22 rolls on the upper surface 41 of the spring plate 40 toward the feeding position A side, that is, the left side in FIG. 4, due to the inclination of the upper surface 41 of the spring plate 40 (position B2 in FIG. 4).

[0020] In the stopper member 30 having a concave shape, the rising on the side opposite to the end face 31 (the left side in the figure) is made higher than the rising on the end face 31 side. Therefore, the bar 22 that has rolled on the upper surface 41 of the spring plate 40 hits the inner surface 33 of the rising on the side opposite to the end face 31, and the rolling is stopped. After that, when the spring plate 40 is returned to the horizontal state by the cylinder 50, the bar 22 is lowered toward the concave portion of the concave-shaped stopper member 30 while contacting the upper surface 41 of the spring plate 40 and the inner surface 33 of the stopper member 30, and is placed on the roller 34 and positioned at the feeding position A.

[0021] When the raised spring plate 40 lifts the rod 22 that was in the supply standby position B, the rod 22 adjacent to the rod 22 in the supply standby position B rolls along the supply rail 26 according to the inclination of the supply rail 26. However, while the spring plate 40 is raised, its right end 42 prevents further rolling. When the spring plate 40 is returned to its horizontal position, it rolls further along the supply rail 26 until it contacts the end face 31 of the stopper member 30, and is positioned in the supply standby position B.

[0022] Figure 5 is a side view of the bar cutting machine 10 of Figure 1 with the cover 10a removed, viewed from the direction indicated by arrow V. As shown in this figure, the main body 12 consists of a base 38, a feeding device 16 provided on the base 38, a cutting device 20 also provided on the base 38, and a main vise 90 for gripping and fixing the bar 22 when cutting with the cutting device 20. The main vise 90 includes a hydraulic cylinder 98. The cutting device 20 includes a support part 92 provided on the base 38, an arm member 93 rotatably mounted around the mounting axis of the support part 92, a thin circular saw 94 rotatably mounted on the arm member 93, a circular saw motor 95 for rotationally driving the circular saw 94, and a belt 96 connecting the circular saw 94 and the circular saw motor 95. The cutting device 20 also includes a circular saw moving device 21. The circular saw moving device 21 drives a rotating support member 105 fixed to the upper surface of the base 38 and a rotating support member 106 fixed to the upper part of the arm member 93 of the cutting device 20 that supports the circular saw 94 to move closer to or further away from each other, in order to move the circular saw 94 toward or toward the bar material 22. Specifically, the circular saw moving device 21 includes a hollow cylindrical support member 107 that is rotatably supported by a rotating support member 105 so as to be about a pivot center C3, an electrically driven servo motor 108 that has a ball screw-shaped rotating output shaft substantially concentric with the axis of the support member 107 and is fixed to the end of the support member 107 opposite to the rotating support member 106, and a cylindrical axial moving member 109 that has one end screwed into the outer circumference of the ball screw rotating output shaft and is supported by the inner circumferential surface of the support member 107 so as to be movable in the axial direction but not rotatable about the axis, and has the other end supported by the support member 106 so as to be rotatable about a pivot center C4 parallel to the pivot center C3. The circular saw moving device 21 operates a servo motor 108 to move an axial moving member 109, which is connected to the upper part of the arm member 93 via a rotating support member 106, in the axial direction, i.e., in the direction of arrow d in Figure 5, thereby tilting the arm member 93 around the support part 92 in Figure 5. Here, Figure 5 shows the state in which the cutting device 20 is rotated as far as possible towards the feed device 16. When cutting the bar material 22, the cutting device 20 is rotated in a direction approaching the feed device 16, and once the cutting is complete, it is rotated back in a direction away from the feed device 16.

[0023] Figure 6 is a side view of the feeding device 16, as seen from the direction indicated by arrow VI in Figure 2. As shown in Figure 6, the feeding device 16 comprises a ball screw 66 mounted on a base 58 so as to be rotatable about its axis and with its axis parallel to the feeding direction of the feeding device 16, a pair of guide rails 68 fixed to the base 58 so as to be parallel to the feeding direction of the feeding device 16, a movable member 72 having a pair of sliding parts 70 and screw holes 64 with parallel axes, the pair of guide rails 68 being inserted into the pair of sliding parts 70 so as to be movable in the axial direction of the guide rails 68 and screwed into the ball screw 66 in the screw holes 64, a feeding vise 18 provided on the movable member 72, a feeding device motor 60 for rotationally driving the ball screw 66, and a belt 62 connecting the ball screw 50 and the feeding device motor 60. Furthermore, a first roller 84 is provided on the base 58, and a second roller 85 is provided on the movable member 724, both rotatably mounted around their respective axes. The rod material 22 is transported while being supported by these first roller 84 and second roller 85.

[0024] The bar cutting machine 10 is equipped with a hydraulic control circuit (not shown) for supplying a predetermined hydraulic pressure to the feeder 16 and the cutting device 20, and an electronic control device (not shown) that controls the drive of the feeder 16 and the cutting device 20 by controlling the drive of the circular saw motor 95 and the feeder motor 60, and by controlling the switching of an electromagnetic valve (not shown) in the hydraulic control circuit. When the feeder motor 60 is driven, the driving force is transmitted to the ball screw 66 via the belt 62, causing the ball screw 66 to rotate around its axis, thereby moving the movable member 72, which is screwed onto the ball screw 66, in the feeding direction, that is, in the axial direction common to the ball screw 66 and the pair of guide rails 68. Here, the feeder motor 60 is a servo motor equipped with an encoder connected to the electronic control device.

[0025] The movable member 72 of the feeding vise 18 can have its position detected by an encoder in the feeding device motor 60, and the drive of the feeding device motor 60 is controlled so that the movable member 72 can move within a range from the movement limit on the cutting device 20 side to the movement limit on the feeding device motor 60 side.

[0026] The main vise 90 consists of a first hydraulic cylinder 98 for clamping the rod 22 between itself and a first clamping member in a downward direction as shown in Figures 5 and 6, and a second hydraulic cylinder 102 for clamping the rod 22 between itself and a second clamping member in a leftward direction as shown in Figure 5 (in the depth direction of the paper as shown in Figure 6). The operating hydraulic pressure for the first hydraulic cylinder 98 and the second hydraulic cylinder 102 is supplied via the hydraulic control circuit, and the gripping and release of the rod 22 are switched according to the hydraulic pressure. Here, grooves are formed in the first clamping member, the piston of the second hydraulic cylinder 102, and the part of the second clamping member corresponding to the path of the circular saw 94, so as not to hinder the rotation of the circular saw 94.

[0027] Figure 7 is a cross-sectional view of the movable part of the feeding device 16, taken from the direction indicated by arrow VII in Figure 6. As shown in this figure, the feeding vise 18 provided on the movable member 72 is configured to clamp the rod 22 between the third clamping member 74 and the third hydraulic cylinder 76. The operating hydraulic pressure of the third hydraulic cylinder 76 is supplied via a hydraulic control circuit, and the gripping and release of the rod 22 is switched according to the hydraulic pressure. When the feeding device motor 60 is driven and the movable member 72 is moved while the rod 22 is gripped, the gripped rod 22 is transported by the same distance as the movable member 72.

[0028] Furthermore, as shown in Figure 7, the third hydraulic cylinder 76 provided in the feed vise 18 consists of a cylinder body 77 fixed to a movable member 72, a piston 81 that reciprocates inside the cylinder body 77, and a clamping head 80 fixed to the tip of the piston 81. In the third hydraulic cylinder 76 configured in this way, when hydraulic fluid is supplied to the oil chamber which is the gap between the cylinder body 77 and the piston 81, the piston 81 and the clamping head 80 provided at its tip are moved in a direction that clamps the rod 22 between the third clamping member 74. At that time, since the guide shaft 78 is inserted into the through hole formed in the cylinder body 77, the clamping surface 83 of the clamping head 80 is kept substantially perpendicular to the reciprocating direction of the piston 81.

[0029] Incidentally, in a bar cutting machine 10 having such a configuration, the bar 22 is fed in and cut repeatedly, but when the remaining length of a single bar 22 becomes shorter than a specified value, it is discarded as scrap. This specified value is determined based on the clamping width of the bar 22 between the main vise 90 and the feeding vise 18.

[0030] Since these scraps are shorter in length than the rods 22 supplied to the cutting machine 10, for example, it is difficult to lift them evenly with multiple bouncing plates 40 at the aforementioned spacing, or they may bounce due to the impact of dropping when dropped into the recess 32 of the feeding vise 18 or stopper member 30, making it difficult to supply them to the feeding device 16 by the rod supply device 14 or the like.

[0031] In this embodiment, the bar cutting machine 10 includes a scrap material supply device 112 in addition to the bar material supply device 14 described above. As shown in Figures 2 and 3, the scrap material supply device 112 is composed of a supply slope 113, a lifting section 114, and a lifting device 116. Furthermore, a slope installation beam 118 is provided on the two supply rails 26 closest to the cutting device 20, and the supply slope 113 is supported by the supply rail 26 closest to the cutting device 20 and the slope installation beam 118, as shown in Figure 2, for example. Therefore, the supply slope 113 is inclined at a gradient approximately equal to the downward slope of the supply rails 26 toward the feeding device 16. With the supply slope 113 configured in this way, even scrap material 23 that is less than the distance between the two supply rails 26 can be positioned at the supply standby position B. This scrap material supply device 112 corresponds to the transfer section of the present invention, and the supply slope 113 corresponds to the supply section.

[0032] The end material 23 placed on the supply slope 113 rolls toward the feeding device 16 due to the inclination of the supply slope 113. On the other hand, a lifting section 114 is provided on the feeding device 16 side of the supply slope 113, continuous with the supply slope 113. This lifting section 114 can be raised and lowered by a lifting device 116, which will be described later, and when the lifting section 114 is at its lower limit position, the upper surface 114a of the lifting section 114 forms a slope that is continuous with the supply slope 113 (see Figure 8(a) described later). The slope 114a provided on the upper surface of the lifting section 114 corresponds to the inclined surface of the present invention. Furthermore, a wall section 115 is provided on the feeding device 16 side of the lifting section 114, extending in the direction in which the rod material 22 (end material 23) is fed. This prevents the end pieces 23 from rolling on the upper surfaces of the supply slope 113 and the lifting section 114, thus preventing the end pieces 23 from rolling into the feeding device 16 or colliding with the feeding vise 18. The relationship between the axial length of the end pieces 23 in the lifting section 114 and the length of the end pieces 23 being lifted is set so that when lifting end pieces 23 that are shorter than the rod 22, the length of the end pieces 23 is not too short relative to the axial length of the end pieces 23 in the lifting section 114, preventing them from losing balance and rotating or falling. Alternatively, the length of the end pieces 23 is set so that it is not too long relative to the axial length of the end pieces 23 in the lifting section 114, resulting in only a portion of the end pieces 23 being lifted and preventing them from being fed into the gap 120, as will be described later.

[0033] The wall portion 115 has an inclined surface 115a on its upper surface that slopes downward toward the feeding device 16. This inclined surface 115a is positioned such that the gap 120 between the third clamping member 74 and the clamping head 80 of the feeding vise 18 is located on the extension of the inclined surface 115a. In addition, to ensure stable behavior when the end material 23 rolls into the gap 120 after rolling along the inclined surface 115a, the inclined surface 115a may be positioned to protrude toward the feeding device 16, as shown in Figure 8, relative to the plate-shaped wall portion 115. The inclined surface 115a also corresponds to the inclined surface of the present invention.

[0034] The lifting device 116 is, for example, a hydraulic cylinder and is fixedly mounted on the frame 24. In this case, the lifting device 116 is configured such that the piston of the hydraulic cylinder can move vertically, and the piston is connected to the lifting section 114, so that the vertical movement of the lifting section 114 is achieved by the vertical movement of the piston. Hydraulic pressure is supplied to the hydraulic cylinder acting as the lifting device 116 from the hydraulic control circuit based on instructions from the electronic control device, so that the lifting device 116, and consequently the lifting section 114, moves up and down at the appropriate timing.

[0035] Figure 8 illustrates the operation of supplying scrap material 23 to the feeding vise 18 by the scrap material supply device 112. First, in Figure 8(a), the lifting section 114 is located at the lower end of its vertical movement. The lifting section 114, located at this lower end, forms an inclined surface together with the supply slope 113. The scrap material 23 placed on the supply slope 113 rolls along the inclination toward the feeding device 16 and is stopped by the wall section 115. Also, in Figure 8(a), the width W2 of the gap 120 between the third clamping member 74 and the clamping head 80 in the feeding vise 18 (see Figure 7) is narrower than the width W1 of the scrap material 23.

[0036] Subsequently, the lifting section 114 is raised by the lifting device 116. At this time, the width of the lifting section 114 in the cross-sectional direction of the end material 23 is greater than or equal to the radius of the end material 23, so the end material 23 can be lifted upward by raising the lifting section 114. Due to the inclination of the upper surface of the lifting section 114, the end material 23 tends to roll in the direction of the feeding device 16 (lower left direction in Figure 8), but this rolling is blocked by the wall section 115, so the end material 23 can be lifted along the wall section 115 by raising the lifting section 114.

[0037] Figure 8(b) shows the lifting section 114 raised by the lifting device 116 and positioned at its upper end during its vertical movement. At this time, as shown in Figure 8(b), the height of the lower end (left end in Figure 8) of the inclined surface, which is the upper surface of the lifting section 114, coincides with the height of the inclined surface 115a on the upper surface of the adjacent wall section 115. As a result, the end piece 23 lifted by the lifting section 114 moves over the wall section 115 and onto the inclined surface 115a, which is the upper surface of the wall section 115, and rolls along it. In Figure 8(b), the width W2 of the gap 120 in the feed vise 18 is narrower than the width W1 of the end piece 23.

[0038] Figure 8(c) shows the state in which the end piece 23, which has rolled on the inclined surface 115a, has reached the feed vise 18. When it reaches this state, the end piece 23 will roll down from the end of the inclined surface 115a onto the feed vise 18, but by making the difference between the height of the end of the inclined surface 115a and the height of the upper end of the third clamping member 74 or the clamping head 80 small, the impact when it lands on the feed vise 18 can be reduced. Also in Figure 8(c), the width W2 of the gap 120 in the feed vise 18 is narrower than the width W1 of the end piece 23. Therefore, the end piece 23 that has reached the gap 120 is supported and held in place by the upper ends of the third clamping member 74 and the clamping head 80.

[0039] Figure 8(d) shows the case where the width W2 of the gap 120 in the feeding vise 18 is changed to be larger than that shown in Figures 8(a) to (c). However, the width W2 of the gap 120 is narrower than the width W1 of the end piece 23. As a result, the position of the end piece 23 is lower than that shown in Figure 8(c), but the end piece 23 continues to be supported by the upper end of the third clamping member 74 and the clamping head 80. Also, in Figure 8(d), the lifting part 114 is moved to the lower end position. As shown in Figures 8(b) to (c), while the lifting part 114 is rising, the end piece 23 that is next going to the supply standby position B is prevented from rolling at the lower end of the supply slope 113 by the rising lifting part 114. However, as shown in Figure 8(d), when the lifting part 114 is returned to the lower end position, the end piece 23 rolls until it comes into contact with the wall 115 and reaches the supply standby position B.

[0040] Figure 8(e) shows a state where the width W2 of the gap 120 in the feed vise 18 is even larger than in Figure 8(d), and the width W2 of the gap 120 is equal to or slightly larger than the width W1 of the scrap material 23. In this state, the scrap material 23 reaches the feed position A. In other words, it comes into contact with the second roller 85 located at the bottom between the third clamping member 74 and the clamping head 80 of the feed vise 18.

[0041] In this embodiment, the scrap material feeding device 112 allows the scrap material 23 to be lifted without losing balance. Furthermore, by setting the feeding vise 18 so that the width W2 of the gap 120 between the third clamping member 74 and the clamping head 80 is smaller than the diameter W1 of the scrap material 23, and then gradually widening the width W2 of the gap 120, the height at which the scrap material 23 lands on the feeding vise 18 can be reduced as much as possible, thereby reducing the impact on the feeding vise 18 as much as possible.

[0042] In this embodiment, the scrap material feeding device 112, or the bar cutting machine 10 equipped with the scrap material feeding device 112, is used to transfer the scrap material 23 to the upper part of the feeding vise 18 by the lifting unit 114 when the opening width W2 of the opening 120 of the feeding vise 18 is smaller than the diameter W1 of the scrap material 23, so that the scrap material 23 is supported at the upper end of the opening 120. Subsequently, the opening width W2 of the opening 120 of the feeding vise 18 is gradually increased, and the scrap material 23 gradually descends accordingly. This makes it possible to minimize the height at which the scrap material 23 falls toward the second roller 85 when the opening width W2 of the opening 120 of the feeding vise 18 becomes larger than the diameter W1 of the scrap material 23, thereby reducing the impact on the feeding vise 18.

[0043] Furthermore, according to the scrap material feeding device 112 of this embodiment, or the bar cutting machine 10 equipped with the scrap material feeding device 112, the scrap material feeding device 112 is provided adjacent to the feeding vise 18 in a direction perpendicular to the direction in which the scrap material is fed, and has an upper surface 114a of the lifting section 114 and an upper surface 115a of the wall section 115, as well as an inclined surface that slopes downward toward the feeding vise 18, so that the scrap material 23 can roll toward the feeding vise 18 on this inclined surface.

[0044] Furthermore, according to the scrap material supply device 112 of this embodiment, or the bar cutting machine 10 equipped with the scrap material supply device 112, the bar cutting machine 10 has a bar material supply device 14 that supplies elongated bar materials 22, which are longer than the scrap material 23 that can be lifted by the lifting section 114 of the scrap material supply device 112, to the feeding position A. Therefore, relatively short scrap material 23 that is difficult to supply by the bar material supply device 14 can be supplied by the scrap material supply device 112.

[0045] Although preferred embodiments of the present invention have been described in detail above with reference to the drawings, the present invention is not limited thereto and can be implemented in yet another embodiment.

[0046] For example, in the embodiment described above, a circular saw 20 was used as the cutting tool, but other types of cutting tools, such as a rod-shaped hacksaw with straight teeth, may also be used.

[0047] Furthermore, the ramp plate 113 in the above-described embodiment is not limited to a plate shape. For example, like the multiple supply rails 26 in the rod material supply device 14, multiple rail-shaped members may be provided, as long as the end pieces 23, which are shorter than the rod material 22, can roll stably.

[0048] Furthermore, although a pneumatic clamp was used to secure the entry vise in the above-described embodiment, hydraulic, electromagnetic, or other types of fixing devices may also be used.

[0049] While not provided for further examples, the present invention may be implemented with various modifications without departing from its spirit. [Explanation of symbols]

[0050] 10: Bar cutting machine 12: Main body 14: Bar material supply device (second transfer means) 16: Feeding device 18: Shipping included vise 20: Cutting device 22: Bar material 23: Scraps 112: Scrap material feeding device (feeding device) 113: Slope plate (supply section) 114: Lifting section (transfer section) 114a: Upper surface (inclined surface) of the lifting part 115: Wall 115a: Upper surface (inclined surface) of the wall 116: Lifting device 118: Slope installation beam 120: Gap between 74 and 80 (opening of feed vise 18) W2: Opening width

Claims

1. A bar cutting machine comprising: a feeding device having a feeding vise that is driven to reciprocate along the longitudinal direction of the bar and feeds the bar toward the cutting position in predetermined cutting lengths; a cutting device that cuts the bar perpendicular to the axial direction of the bar; and a supply device that supplies the bar to the feeding vise, The supply device includes a supply unit that aligns a plurality of the rods in a parallel direction toward a predetermined supply standby position, and a transfer unit that moves one of the plurality of rods that has reached the supply standby position above the feeding vise. When the lifting section moves the rod material above the feeding vise, the feeding vise sets the opening width of the feeding vise to be smaller than the diameter of the rod material, and gradually increases the opening width after the rod material is positioned in the opening. A bar cutting machine characterized by the following features.

2. The transfer unit is provided adjacent to the feeding vise, The upper surface of the transfer section has an inclined surface that slopes downward in the direction of the feeding vise. A bar cutting machine according to claim 1, characterized by the following:

3. The supply device has a second transfer means for supplying a longitudinal rod, which is longer than the rod that the transfer unit can transfer, to the feeding position. A bar cutting machine according to claim 1 or 2, characterized by the above.

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