TWI839509B - Bar material feeding apparatus - Google Patents

Abstract

The present invention relates to a bar material feeding apparatus for a bar material supply machine, which rotatably supports a bar material rotating during a cutting process. The bar material feeding apparatus includes a bar holding member for holding the rear end of the bar material, a rod portion that advances when feeding the bar material, and a connecting member disposed between the bar holding member and the rod portion such that the bar holding member is supported in a rotatable manner. The connecting member includes a rotating part integrally supporting the bar holding member, a fixed part connected to the rod portion, and a rotating means connecting the rotating part and the fixed part in a manner that allows the two parts to rotate relatively. The bar holding member has a holding part with a hollow section into which the rear end of the bar material can be inserted, and a finger-shaped member rotatably received in the holding part and holding the rear end of the bar material. The finger-shaped member has a tubular elastic body, and a tubular metal body covering the tubular elastic body.

Description

Bar feeding device

The present invention relates to a bar feeding device of a bar feeding machine, and more specifically, to an improvement of a bar feeding device arranged on a bar feeding axis of a bar feeding machine.

It is known that there is a bar feeding machine configured to automatically feed long bars to an automatic lathe such as an NC lathe. This bar feeding machine is equipped with a bar feeding means for feeding bars to the automatic lathe, and the bar feeding means is equipped with: a bar feeding device such as a feed rod for feeding the bars toward the automatic lathe, and a driving device for the bar feeding device composed of a driving motor and a chain.

The driving device generally provides a driving force or thrust force in the forward direction to the bar feeding device, whereby the bar feeding device supplies bars to the automatic lathe according to the product processing procedure of the automatic lathe, for example.

The bar feeding device of the bar feeding machine generally has a hollow cylindrical finger chuck for holding the rear end of the bar as a workpiece or material. The finger chuck is rotatably mounted on the head end or front end of the bar feeding device. In addition, the rear end of the bar is inserted into the hollow part of the finger chuck and the bar is held by the finger chuck.

FIG. 13 is a schematic side view showing the structure of such a bar feeding device. The feed rod 1 constituting the bar feeding device comprises: a rod 2 disposed on the bar feeding axis X-X of the bar feeding machine, and a finger clamp 4 mounted on the front end of the rod 2.

The blade portion 3 provided at the rear end of the feed rod 1 is coupled to the surrounding chain C (which may also be a belt and a pulley, etc.) constituting the driving device for the rod feeding device. In addition, a rotatable connecting member 10 called a clamp joint is installed between the finger clamp 4 and the rod 2.

The rear end of the rod W is embedded in the finger clamp 4, thereby being held by the finger clamp 4. When the rod W clamped by the collet chuck of the main spindle of the NC automatic lathe rotates at high speed, the connecting structure 10 supports the finger clamp 4 to be rotatable, that is, the finger clamp 4 can rotate with the rotation of the rod W.

The finger-shaped clamp 4 that can be mounted on the feed rod 1 is generally a cylindrical elastic body (symbol 30 in the document) made of polyurethane resin, etc., as shown in Japanese Utility Model Publication No. 57-91502 (Patent Document 1). The elastic body 30 elastically holds the rear end of the rod W inserted into the finger-shaped clamp 4.

The inventor of this case observed that the cylindrical elastic body of polyurethane resin or the like in the rod holding member (finger clamp) will be stretched and deformed due to the insertion of the rod W, and when the rod rotates, the rod holding member (finger clamp) may be "carried along". In this case, the cylindrical elastic body is subjected to torsional load, and there is a possibility that the cylindrical elastic body will suffer undesirable damage.

On the other hand, the inventor of this case has observed that, compared with the frictional sliding resistance between the cylindrical elastic body and the main body (usually made of metal) of the rod holding member (finger-shaped clamp), the frictional sliding resistance between the cylindrical metal cover covering the cylindrical elastic body and the main body (usually made of metal) of the rod holding member (finger-shaped clamp) can achieve the same degree of low resistance by using an appropriate amount of lubricating oil, etc.

The present invention is developed based on the above background. The purpose of the present invention is to provide a rod feeding device that can effectively prevent deformation and damage of a cylindrical elastic body such as polyurethane resin in a rod holding member (finger clamp).

The present invention is a bar feeding device of a bar feeding machine, which is rotatably supported for a bar that rotates during cutting. The bar feeding device comprises: a bar holding member for holding the rear end of the bar, a rod that advances when feeding the bar, and a connecting member disposed between the bar holding member and the rod to support the bar holding member so that it can rotate; wherein the connecting member comprises: a rotating portion that integrally supports the bar holding member, a connecting member The fixing part connected to the rod part and the rotating means connecting the rotating part and the fixing part so as to be relatively rotatable; the rod holding member comprises: a holding part and a finger-shaped member, the holding part comprises a hollow part for receiving the rear end of the rod, the finger-shaped member is rotatably received in the holding part and holds the rear end of the rod; the finger-shaped member comprises: a cylindrical elastic body and a cylindrical metal body covering the cylindrical elastic body.

According to the present invention, since the cylindrical elastic body is covered by the cylindrical metal body, damage to the cylindrical elastic body can be effectively suppressed. On the other hand, it is confirmed that the frictional sliding resistance between the cylindrical metal body covering the cylindrical elastic body and the holding portion of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc. Thus, it is confirmed that the rod can be stably supported and fed even when the rod rotates at a high speed by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member.

Preferably, the aforementioned tubular elastic body is a cylindrical elastic body, and the aforementioned tubular metal body is a cylindrical metal body.

In addition, the present invention is a bar feeding device of a bar feeding machine, which rotatably supports a bar that rotates during cutting, and the bar feeding device comprises: a bar holding member that holds the rear end of the bar, a rod that advances when feeding the bar, and a connecting member that is arranged between the bar holding member and the rod and supports the bar holding member so that it can rotate; wherein the connecting member comprises: a rotating portion that integrally supports the bar holding member, a fixing portion that is connected to the rod, and a connecting member that connects the rod to the rod. The rotating part is connected to the aforementioned fixed part to form a rotating means that can rotate relatively; the aforementioned rod holding member comprises: a holding part and a finger-shaped member, the holding part has a hollow part that can accept the insertion of the rear end of the rod, and the finger-shaped member is rotatably accommodated in the holding part and holds the rear end of the aforementioned rod; the aforementioned finger-shaped member has a cylindrical metal body; the aforementioned cylindrical metal body is provided with: a through hole that penetrates in a direction perpendicular to the axial direction, and a slit hole extending from the through hole to the front end in the axial direction.

According to the present invention, since the structure does not require a cylindrical elastic body, there is no problem that the elastic body mentioned above will be damaged. On the other hand, it is confirmed that the cylindrical metal body can be elastically deformed due to the presence of the slit hole, so the rear end of the rod can be elastically and stably held. In addition, it is confirmed that the frictional sliding resistance between the cylindrical metal body and the holding part of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil. Thus, it is confirmed that the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member can stably support and feed the rod even when the rod rotates at high speed.

Preferably, the aforementioned cylindrical metal body is a cylindrical metal body. Also, preferably, the slit holes are a pair of slit holes facing each other. Alternatively, preferably, the slit holes are three or more slit holes evenly distributed along the circumferential direction (which can be called three-partition, four-partition, etc.). The slit holes are generally straight lines along the axial direction, but can also extend obliquely relative to the axial direction.

In addition, the present invention is a bar feeding device of a bar feeding machine, which rotatably supports a first bar or a second bar that rotates during cutting, and the bar feeding device comprises: a bar holding member that holds the rear end of the first bar having a first diameter or the second bar having a second diameter different from the first diameter, a rod that advances when feeding the bar, and a connecting member that is disposed between the bar holding member and the rod and supports the bar holding member so that it can rotate; wherein the connecting member comprises: a rotating portion that integrally supports the bar holding member, a fixed portion that is connected to the rod, and a connecting member that connects the rotating portion and the fixed portion so that they can rotate relative to each other. The rotating means for rotation; the aforementioned rod holding member comprises: a holding portion, a first finger-shaped member and a second finger-shaped member, the holding portion has a hollow portion that can accept the insertion of the rear end of the first rod or the second rod, the first finger-shaped member is rotatably accommodated in the holding portion and can hold the rear end of the aforementioned first rod, and the second finger-shaped member is rotatably accommodated in the holding portion and can hold the rear end of the aforementioned second rod; the aforementioned first finger-shaped member and the aforementioned second finger-shaped member each have a cylindrical metal body, and each cylindrical metal body is provided with: a through hole that penetrates in a direction perpendicular to the axial direction, and a slit hole extending from the through hole to the front end in the axial direction.

According to the present invention, since a cylindrical elastic body is not required, there is no problem that the elastic body mentioned above is damaged. On the other hand, it is confirmed that each cylindrical metal body can be elastically deformed due to the presence of the slit hole, so the rear end of the first rod or the second rod can be elastically and stably grasped. In addition, it is confirmed that the frictional sliding resistance between each cylindrical metal body and the holding portion of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc. In this way, it is confirmed that the first rod or the second rod can be stably supported and fed even when the first rod or the second rod rotates at a high speed by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member. As described above, it has been confirmed that these finger-shaped members can be selectively utilized for first rods and second rods of different diameters.

In addition, the present invention is a bar feeding device of a bar feeding machine, which rotatably supports a first bar or a second bar that rotates during cutting, and the bar feeding device comprises: a bar holding member that holds the rear end of the first bar having a first diameter or the second bar having a second diameter different from the first diameter, a rod that advances when feeding the bar, and a connecting member that is arranged between the bar holding member and the rod and supports the bar holding member so that it can rotate; wherein the connecting member comprises: a rotating portion that integrally supports the bar holding member, a fixing portion that is connected to the rod, and a connecting member that connects the bar holding member to the rod. The aforementioned rotating part and the aforementioned fixed part are connected to form a rotating means that can rotate relatively; the aforementioned bar holding member comprises: a holding part, a first finger-shaped member and a second finger-shaped member, the holding part has a hollow part that can accept the insertion of the rear end of the first bar or the second bar, the first finger-shaped member is rotatably accommodated in the holding part and can hold the rear end of the aforementioned first bar, and the second finger-shaped member is rotatably accommodated in the holding part and can hold the rear end of the aforementioned second bar; the aforementioned first finger-shaped member and the aforementioned second finger-shaped member each comprise: a cylindrical elastic body and a cylindrical metal body covering the cylindrical elastic body.

According to the present invention, since the cylindrical elastic body is covered with a cylindrical metal body in each of the first finger-shaped member and the second finger-shaped member, damage to the cylindrical elastic body can be effectively suppressed. On the other hand, it is confirmed that the frictional sliding resistance between the cylindrical metal body covering the cylindrical elastic body and the holding portion of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc. In this way, it is confirmed that the first rod or the second rod can be stably supported and fed even when the first rod or the second rod rotates at a high speed by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member. As described above, it is confirmed that these finger-shaped members can be selectively used for first rods and second rods of different diameters.

In addition, the present invention is a bar feeding device of a bar feeding machine, which rotatably supports a first bar or a second bar that rotates during cutting, and the bar feeding device is equipped with: a bar holding member that holds the rear end of a first bar having a first diameter or a second bar having a second diameter different from the first diameter, a rod that advances when feeding the bar, and a connecting member that is arranged between the bar holding member and the rod and supports the bar holding member so that it can rotate; wherein the connecting member has: a rotating part that integrally supports the bar holding member, a fixed part connected to the rod, and a rotating means that connects the rotating part and the fixed part so that they can rotate relative to each other; the bar holding member has a holding part, a first finger, and a rotating part. The first finger-shaped member and the second finger-shaped member, the holding portion has a hollow portion that can accept the insertion of the rear end of the first rod or the second rod, the first finger-shaped member is rotatably accommodated in the holding portion and can hold the rear end of the first rod, and the second finger-shaped member is rotatably accommodated in the holding portion and can hold the rear end of the second rod; one of the first finger-shaped member and the second finger-shaped member has a cylindrical metal body, and the cylindrical metal body is provided with: a through hole passing through in a direction perpendicular to the axial direction, and a slit hole extending from the through hole to the front end in the axial direction; the other of the first finger-shaped member and the second finger-shaped member has: a cylindrical elastic body, and a cylindrical metal body covering the cylindrical elastic body.

According to the present invention, since one of the first finger-shaped member and the second finger-shaped member is composed of an elastic body that does not require a cylindrical shape, there is no problem that the elastic body described above is damaged. On the other hand, it was confirmed that the cylindrical metal body can be elastically deformed due to the presence of the slit hole, so that the rear end of one of the first rod and the second rod can be elastically and stably grasped. Moreover, it was confirmed that the frictional sliding resistance between the cylindrical metal body and the grasping portion of the rod grasping member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc. Therefore, it was confirmed that the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotating means of the connecting member can stably support and feed the rod even when one of the first rod and the second rod rotates at a high speed. In addition, since the other of the first finger-shaped member and the second finger-shaped member covers the cylindrical elastic body with a cylindrical metal body, the situation where the cylindrical elastic body is damaged can be effectively suppressed. On the other hand, it was confirmed that the frictional sliding resistance between the cylindrical metal body covering the cylindrical elastic body and the holding portion of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc. Therefore, it was confirmed that the other of the first rod or the second rod can be stably supported and fed even when the other of the first rod or the second rod rotates at a high speed by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member. As described above, it was confirmed that these finger-shaped members can be selectively used for the first rod and the second rod of different diameters.

According to one aspect of the present invention, since the cylindrical elastic body is covered by a cylindrical metal body, damage to the cylindrical elastic body can be effectively suppressed. On the other hand, it is confirmed that the frictional sliding resistance between the cylindrical metal body covering the cylindrical elastic body and the holding portion of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc. Therefore, it is confirmed that the rod can be stably supported and fed even when the rod rotates at a high speed by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member.

According to another aspect of the present invention, since the structure does not require a cylindrical elastic body, there is no problem that the elastic body mentioned above will be damaged. On the other hand, it is confirmed that the cylindrical metal body can be elastically deformed due to the presence of the slit hole, so the rear end of the rod can be elastically and stably held. In addition, it is confirmed that the frictional sliding resistance between the cylindrical metal body and the holding portion of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil. Therefore, it is confirmed that the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member can stably support and feed the rod even when the rod rotates at high speed.

According to another aspect of the present invention, since the structure does not require a cylindrical elastic body, there is no problem that the elastic body described above is damaged. On the other hand, it was confirmed that each cylindrical metal body can be elastically deformed due to the presence of the slit hole, so that the rear end of the first rod or the second rod can be elastically and stably grasped. In addition, it was confirmed that the frictional sliding resistance between each cylindrical metal body and the holding portion of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil. Therefore, it was confirmed that the first rod or the second rod can be stably supported and fed even when the first rod or the second rod rotates at a high speed by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member. As described above, it has been confirmed that these finger-shaped members can be selectively utilized for first rods and second rods of different diameters.

According to another aspect of the present invention, since the cylindrical elastic body is covered with a cylindrical metal body in each of the first finger-shaped member and the second finger-shaped member, damage to the cylindrical elastic body can be effectively suppressed. On the other hand, it is confirmed that the frictional sliding resistance between the cylindrical metal body covering the cylindrical elastic body and the holding portion of the rod holding member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc. Therefore, it is confirmed that the first rod or the second rod can be stably supported and fed even when the first rod or the second rod rotates at a high speed by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member. As described above, it is confirmed that these finger-shaped members can be selectively used for first rods and second rods of different diameters.

According to a further aspect of the present invention, since one of the first finger-shaped member and the second finger-shaped member is composed of an elastic body that does not need to be cylindrical, there is no problem that the elastic body described above is damaged. On the other hand, it was confirmed that the cylindrical metal body can be elastically deformed due to the presence of the slit hole, so that the rear end of one of the first rod and the second rod can be elastically and stably grasped. Furthermore, it was confirmed that the frictional sliding resistance between the cylindrical metal body and the grasping portion of the rod grasping member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil or the like. Therefore, it was confirmed that the rod can be stably supported and fed even when one of the first rod and the second rod rotates at a high speed, by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member. In addition, since the other of the first finger-shaped member and the second finger-shaped member covers the cylindrical elastic body with a cylindrical metal body, it is possible to effectively suppress the situation where the cylindrical elastic body is damaged. On the other hand, it was confirmed that the frictional sliding resistance between the cylindrical metal body covering the cylindrical elastic body and the gripping portion of the rod gripping member can be maintained at a sufficiently low resistance by using an appropriate amount of lubricant or the like. Therefore, it was confirmed that the rod can be stably supported and fed even when the other of the first rod and the second rod rotates at a high speed by the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the connecting member. As described above, it was confirmed that these finger-shaped members can be selectively used for the first rod and the second rod of different diameters.

1,101,201,301,401: Feed rod

2,102,202,302,402: Rod

3,103,203,303,403: Leaf section

4,104,204,304,404: Finger clamps

10: Connecting components

105,205,305,405:Handling part

105a, 205a, 305a, 405a: truncated cone-shaped opening

105b, 205b, 305b, 405b: Connection part

105c,205c,305c,405c: Cylindrical space

105f, 205f, 305f, 405f: flange

110,210,310,410: Clamp connector

111,211,311,411: Fixed components

111a, 211a: front opening

112,212,312,412: Rotating components

112a, 212a: Hollow cylindrical part

112f, 212f: flange

113,213,313,413: shaft components

114,214:Sales

115,215: Backend expansion

116,216: Ring-shaped shoulder, shoulder

117,217:Steel Ball

118,218: Steel ball support part

119: Female screw thread

130,230,330,430: Finger-shaped components

131: Elastic body

131a,232a,332a,432a: truncated cone-shaped opening

131c,232c,332c,432c,462c:Inner space

132,232,332,432,462:Metallic body

135,235: Area (area for accommodating rotating objects)

219: Female screw thread

232s: narrow slit

232t,332t,432t,462t:Through hole

317,333,335,417,433,435: Cylindrical roller bearings

319,419: Male thread part

332s,432s,462s: narrow slits

440: Spacer

C: Wrap chain

W: Rods

X-X: Bar feeding axis

FIG1 is a schematic side view showing a bar feeding device of a bar feeding machine of the first embodiment of the present invention.

Figure 2 is a longitudinal cross-sectional view of the main part of the rod feeding device of the first embodiment of the present invention.

Figure 3 is a cross-sectional view of the cylindrical metal body of Figure 2.

Figure 4 is an end view of the cylindrical metal body in Figure 2.

FIG5 is a schematic side view showing the bar feeding device of the bar feeding machine of the second embodiment of the present invention.

Figure 6 is a longitudinal cross-sectional view of the main part of the rod feeding device of the second embodiment of the present invention.

FIG7 is a cross-sectional view of the finger-shaped member of FIG6.

Figure 8 is an end view of the finger-shaped component in Figure 6.

FIG9 is a schematic side view showing the bar feeding device of the bar feeding machine of the third embodiment of the present invention.

Figure 10 is a longitudinal sectional view of the main part of the rod feeding device of the third embodiment of the present invention.

FIG. 11 is a schematic side view showing the bar feeding device of the bar feeding machine of the fourth embodiment of the present invention.

Figure 12 is a longitudinal sectional view of the main part of the rod feeding device of the fourth embodiment of the present invention.

FIG13 is a schematic side view showing the structure of a conventional bar feeding device.

Below, the implementation of the present invention is described with reference to the drawings.

<First implementation form>

FIG1 is a schematic side view of a bar feeding device of a bar feeding machine of the first embodiment of the present invention, FIG2 is a longitudinal cross-sectional view of the main part of the bar feeding device of the first embodiment of the present invention, FIG3 is a cross-sectional view of the cylindrical metal body of FIG2, and FIG4 is an end view of the cylindrical metal body of FIG2.

As shown in Figures 1 to 4, the bar feeding device of the bar feeder of the first embodiment of the present invention is a feed rod 101. The feed rod 101 is provided with: a rod 102 arranged on the bar feeding axis X-X of the bar feeder, a blade 103 integrally fixed to the rear end of the rod 102, and a finger clamp 104 (bar gripping member) mounted on the front end of the rod 102.

The blade part 103 is coupled to the endless chain C constituting the feeding rod driving means or the pushing means of the bar feeding machine. The endless chain C is hung around the driving sprocket and the driven sprocket (not shown), and the driving sprocket and the driven sprocket are rotatably mounted on the housing (not shown) of the bar feeding machine. The driving sprocket is connected to a power source such as an electric motor (not shown), and rotates with the action of the power source, so that the endless chain C moves in an endless manner. As the endless chain C moves in an endless manner, the blade part 103 coupled to the moving area of the endless chain C moves forward or backward. A belt and a pulley may also be used to replace the looped chain C.

The finger clamp 104 is supported at the front end of the rod 102 by a clamp joint 110 (connecting structure) provided at the front end area of the rod 102. The clamp joint 110 is fixed to the rod 102 and supports the finger clamp 104 to be rotatable.

The finger-shaped clamp 104 has a gripping portion 105 into which the rear end of the rod W (a rod with an outer diameter of 1.0 mm in this example) can be inserted, and the finger-shaped member 130 is rotatably accommodated in the gripping portion 105 to grip the rear end of the rod W. The finger-shaped member 130 has a cylindrical elastic body 131 and a cylindrical metal body 132 covering the cylindrical elastic body 131.

In this embodiment, the cylindrical elastic body 131 is composed of a cylindrical polyurethane member, as shown in FIG. 2, for example, with an outer diameter of 3.4 mm, an inner diameter of 0.8 mm, and a length of 9.5 mm, and a truncated cone-shaped opening 131a with a top angle of 60° and an opening diameter of 2.5 mm connected to its internal space 131c is provided at one end. The cylindrical metal body 132 is composed of cylindrical steel, stainless steel, etc., as shown in FIG. 3 and FIG. 4, for example, with an outer diameter of 4.0 mm, an inner diameter of 3.4 mm, and a length of 9.5 mm. The elastic body 131 and the metal body 132 are fixed to each other by, for example, bonding, and can also be integrally molded by a molding method called "polyurethane molding".

As shown in FIG. 2 , the clamp joint 110 has a rotating member 112 (rotating portion) disposed at the front portion and a fixed member 111 (fixed portion) disposed at the rear portion. The fixed member 111 of the clamp joint 110 is integrally fixed to the front end of the rod 102, and the rotating member 112 of the clamp joint 110 integrally supports the finger clamp 104.

More specifically, the gripping portion 105 of the finger-shaped clamp 104 has a diameter of 5.0 mm and a length of 12.5 mm, and a truncated cone-shaped opening 105a with a top angle of 60° and an opening diameter of 4.5 mm is provided on the front end. The truncated cone-shaped opening 105a is connected to the cylindrical space 105c with an inner diameter of 4.05 mm through a connecting portion 105b with an inner diameter of 2.2 mm and a length of 1.0 mm.

Furthermore, the finger-shaped member 130 is rotatably accommodated in the front inner side of the cylindrical space 105c. Therefore, the rear end of the rod W can be inserted through the truncated cone-shaped opening 105a and the connecting portion 105b of the gripping portion 105, and the truncated cone-shaped opening 131a and the inner space 131c of the elastic body 131.

In this example, the inner wall surface of the inner space 131c of the elastic body 131 is formed into a smooth cylindrical surface without step differences or sections. However, as required, a plurality of rib-like protrusions extending along the axial direction and protruding inward in the radial direction can be formed on the inner wall surface. The diameter of the inner wall surface or the diameter of the inscribed circle of the front end of the rib-like protrusion is set to be slightly smaller than the outer diameter of the rod W.

The front end of the finger-shaped member 130 faces the rear end of the flange 105f (the part forming the connecting part 105b) of the grip 105 and is restricted from moving forward by the flange 105f. On the other hand, the rear end of the finger-shaped member 130 can rotate relative to the front end of the rotating member 112 via a rotating body such as a steel ball accommodated in the area 135. However, the rotating body can also be omitted. Alternatively, when the diameter of the rod is larger, a thrust bearing can be provided to replace the rotating body.

The rotating member 112 of the clamp joint 110 has: a hollow cylindrical portion 112a having an outer diameter smaller than the outer diameter of the finger clamp 104, and a flange portion 112f. The shaft member 113 is inserted into the rotating member 112 and connected to the rotating member 112 by the pin 114.

The rear portion of the shaft member 113 is inserted into the front opening 111a of the fixed member 111. The fixed member 111 is a cylindrical hollow member having substantially the same outer diameter as the flange 112f of the rotating member 112. An annular shoulder 116 is formed in the hollow portion of the fixed member 111, and the rear end expansion portion 115 of the shaft member 113 is slidably in contact with the shoulder 116.

The rear side of the rear end expansion part 115 is provided with a concave part that complements the shape of the steel ball 117 and slides in contact with the steel ball 117. Steel ball support parts 118 are arranged at predetermined intervals from the rear end expansion part 115 to the rear, and three steel balls 117 arranged in a straight line are freely rotatably installed between the rear end expansion part 115 and the steel ball support part 118.

In addition, the male thread portion (not shown) protruding forward from the front end surface of the rod portion 102 is locked into the female thread portion 119 of the clamp joint 110 and locked.

Next, the operation of the feed rod 101 of this embodiment will be described.

The rear end of the rod W disposed on the rod feeding axis X-X is inserted by the truncated cone opening 105a and the connecting portion 105b of the gripping portion 105 and the truncated cone opening 131a and the internal space 131c of the elastic body 131, and is embedded in the internal space 131c. The inner peripheral wall surface of the elastic body 131 will slightly expand in diameter, and the rear end surface of the rod W will be elastically gripped by the elastic restoring force of the elastic body 131. In this way, the rear end of the rod W is elastically gripped by the finger-shaped member 130 of the finger-shaped clamp 104.

The front end of the rod W is inserted into, for example, an NC automatic lathe (not shown) and passed through the spindle inner tube of the NC automatic lathe. The spindle of the NC automatic lathe clamps the front end of the rod W with a collet chuck, and then rotates the rod W at high speed while cutting the outer periphery of the front end of the rod W with a turning tool.

The surrounding chain C continuously applies a predetermined thrust or driving force acting forward to the feed rod 101. However, since the shaft member 113 and the rotating member 112 can rotate relative to the fixed member 111 fixed to the rod 102, and the finger member 130 can also rotate relative to the gripping portion 105 fixed to the rotating member 112, the rear end of the high-speed rotating rod W will be supported by the feed rod 101 to be freely rotatable.

According to the feed rod 101 (rod feeding device) of the present embodiment as described above, since the cylindrical elastic body 131 is covered by the cylindrical metal body 132, the situation where the cylindrical elastic body 131 is damaged can be effectively suppressed.

Furthermore, the inventor of this case has confirmed that the frictional sliding resistance between the cylindrical metal body 132 covering the cylindrical elastic body 131 and the gripping portion 105 can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc., or preferably by applying a surface treatment (manganese phosphate film treatment, nitriding treatment, etc.) with low frictional sliding resistance, good wear resistance, and high oil retention. Thus, it has been confirmed that the rotation accompanied by the frictional sliding between the two and the rotation allowed by the rotation means of the clamp joint 110 (specifically, the three steel balls 117 and the rear end expansion portion 115 and the steel ball support portion 118 supporting the three steel balls 117) can stably support and feed the rod W even when the rod W rotates at a high speed.

<Second implementation form>

FIG. 5 is a schematic side view of the bar feeding device of the bar feeding machine of the second embodiment of the present invention, FIG. 6 is a longitudinal sectional view of the main part of the bar feeding device of the second embodiment of the present invention, FIG. 7 is a sectional view of the finger-shaped member of FIG. 6, and FIG. 8 is an end view of the finger-shaped member of FIG. 6.

As shown in Figures 5 to 8, the bar feeding device of the bar feeder of the second embodiment of the present invention is a feed rod 201. The feed rod 201 also has: a rod 202 arranged on the bar feeding axis X-X of the bar feeder, a blade 203 integrally fixed to the rear end of the rod 202, and a finger clamp 204 (bar gripping member) mounted on the front end of the rod 202.

The blade part 203 is coupled to the endless chain C constituting the feeding rod driving means or the pushing means of the bar feeding machine. The endless chain C is hung around the driving sprocket and the driven sprocket (not shown), and the driving sprocket and the driven sprocket are rotatably mounted on the housing (not shown) of the bar feeding machine. The driving sprocket is connected to a power source such as an electric motor (not shown), and rotates with the action of the power source, so that the endless chain C moves in an endless manner. As the endless chain C moves in an endless manner, the blade part 203 coupled to the moving area of the endless chain C moves forward or backward. Belts and pulleys may also be used to replace the looped chain C.

The finger clamp 204 is supported at the front end of the rod 202 by a clamp joint 210 (connecting structure) provided at the front end area of the rod 202. The clamp joint 210 is fixed to the rod 202 and supports the finger clamp 204 to be rotatable.

The finger-shaped clamp 204 has a gripping portion 205 into which the rear end of the rod W (a rod with an outer diameter of 2.0 mm in this example) can be inserted, and the finger-shaped member 230 is rotatably accommodated in the gripping portion 205 to grip the rear end of the rod W. The finger-shaped member 230 has a cylindrical metal body 232. The cylindrical metal body 232 is provided with a through hole 232t that penetrates in a direction perpendicular to the axial direction, and a pair of slit holes 232s that extend from the through hole 232t to the front end along the axial direction.

In this embodiment, the cylindrical metal body 232 is composed of cylindrical steel parts, SUJ materials, SCM, etc., as shown in Figures 7 and 8, for example, the outer diameter is 4.0mm, the inner diameter is 2.0mm, the length is 9.5mm, and a truncated cone-shaped opening 232a with a top angle of 118° and an opening diameter of 3.6mm is provided at one end, which is connected to the internal space 232c. The through hole 232t is formed as a hole with a diameter of 2.0mm centered at a position 2mm away from the other end, and the width of the opposite slit hole 232s is 0.5mm.

As shown in FIG. 6 , the clamp joint 210 has a rotating member 212 (rotating portion) disposed at the front portion and a fixed member 211 (fixed portion) disposed at the rear portion. The fixed member 211 of the clamp joint 210 is integrally fixed to the front end of the rod 202, and the rotating member 212 of the clamp joint 210 integrally supports the finger clamp 204.

More specifically, the gripping portion 205 of the finger-shaped clamp 204 has a diameter of 5.0 mm and a length of 12.5 mm, and a truncated cone-shaped opening 205a with a top angle of 60° and an opening diameter of 4.5 mm is provided on the front end. The truncated cone-shaped opening 205a is connected to the cylindrical space 205c with an inner diameter of 4.05 mm through a connecting portion 205b with an inner diameter of 2.2 mm and a length of 1.0 mm.

Furthermore, the finger-shaped member 230 is rotatably accommodated in the front inner side of the cylindrical space 205c. Therefore, the rear end of the rod W can be inserted through the truncated cone-shaped opening 205a and the connecting portion 205b of the gripping portion 205, and the truncated cone-shaped opening 232a and the inner space 232c of the metal body 232.

In this example, the inner wall surface of the inner space 232c of the metal body 232 is formed into a smooth cylindrical surface without step differences or sections. However, as required, a plurality of rib-like protrusions extending in the axial direction and protruding inward in the radial direction may be formed on the inner wall surface. The diameter of the inner wall surface or the diameter of the inscribed circle of the front end of the rib-like protrusion is set to be slightly smaller than the outer diameter of the rod W.

The front end of the finger-shaped member 230 faces the rear end of the flange 205f (the part forming the connecting part 205b) of the grip 205 and is restricted from moving forward by the flange 205f. On the other hand, the rear end of the finger-shaped member 230 can rotate relative to the front end of the rotating member 212 via a rotating body such as a steel ball accommodated in the area 235. However, the rotating body can also be omitted. Alternatively, when the diameter of the rod is larger, a thrust bearing can be provided to replace the rotating body.

The rotating member 212 of the clamp joint 210 has: a hollow cylindrical portion 212a having an outer diameter smaller than the outer diameter of the finger clamp 204, and a flange portion 212f. The shaft member 213 is inserted into the rotating member 212 and connected to the rotating member 212 by the pin 214.

The rear portion of the shaft member 213 is inserted into the front opening 211a of the fixed member 211. The fixed member 211 is a cylindrical hollow member having substantially the same outer diameter as the flange 212f of the rotating member 212. An annular shoulder 216 is formed in the hollow portion of the fixed member 211, and the rear end expansion portion 215 of the shaft member 213 is slidably in contact with the shoulder 216.

The rear side of the rear end expansion part 215 is provided with a concave part that complements the shape of the steel ball 217 and slides in contact with the steel ball 217. Steel ball support parts 218 are arranged at predetermined intervals from the rear end expansion part 215 to the rear, and three steel balls 217 arranged in a straight line are freely rotatably installed between the rear end expansion part 215 and the steel ball support part 218.

In addition, the male thread portion (not shown) protruding forward from the front end of the rod portion 202 is locked into the female thread portion 219 of the clamp joint 210 and locked.

Next, the operation of the feed rod 201 of this embodiment will be described.

The rear end of the rod W disposed on the rod feeding axis X-X is inserted into the truncated cone opening 205a and the connecting portion 205b of the gripping portion 205 and the truncated cone opening 232a of the metal body 232 and the internal space 232c, and is embedded in the internal space 232c. The inner peripheral wall surface of the metal body 232 will slightly expand in diameter, and the rear end surface of the rod W will be elastically gripped by its elastic restoring force. In this way, the rear end of the rod W is elastically gripped by the finger-shaped member 230 of the finger-shaped clamp 204.

The front end of the rod W is inserted into, for example, an NC automatic lathe (not shown) and passed through the spindle inner tube of the NC automatic lathe. The spindle of the NC automatic lathe clamps the front end of the rod W with a collet chuck, and then rotates the rod W at high speed while cutting the outer periphery of the front end of the rod W with a turning tool.

The surrounding chain C continuously applies a predetermined thrust or driving force acting forward to the feed rod 201. However, since the shaft member 213 and the rotating member 212 can rotate relative to the fixed member 211 fixed to the rod 202, and the finger-shaped member 230 can also rotate relative to the gripping portion 205 fixed to the rotating member 212, the rear end of the high-speed rotating rod W will be supported by the feed rod 201 to be freely rotatable.

According to the feed rod 201 (rod feeding device) of the present embodiment as described above, since it does not require a cylindrical elastic body, there is no problem of the elastic body being damaged.

Furthermore, the inventor of this case has confirmed that the cylindrical metal body 232 can be elastically deformed due to the presence of a pair of opposing slit holes 232s, so that the rear end of the rod W can be elastically and stably grasped.

In addition, the inventor of this case confirmed that the friction and sliding resistance between the cylindrical metal body 232 and the gripping part 205 can be maintained at a sufficiently low resistance by using an appropriate amount of lubricating oil, etc., or preferably by applying a surface treatment (manganese phosphate film treatment, nitriding treatment, etc.) with low friction and sliding resistance, good wear resistance, and high oil retention. Thus, it was confirmed that the rotation accompanied by the friction and sliding between the two and the rotation allowed by the rotation means of the clamp joint 210 (specifically, the three steel balls 217 and the rear end expansion part 215 supporting the three steel balls 217 and the steel ball support part 218) can stably support and feed the rod W even when the rod W rotates at a high speed.

<Third implementation form>

FIG. 9 is a schematic side view showing the bar feeding device of the bar feeding machine of the third embodiment of the present invention, and FIG. 10 is a longitudinal cross-sectional view of the main part of the bar feeding device of the third embodiment of the present invention.

As shown in Figures 9 and 10, the bar feeding device of the bar feeding machine of the third embodiment of the present invention is a feed rod 301. The feed rod 301 also has: a rod 302 arranged on the bar feeding axis X-X of the bar feeding machine, a blade 303 integrally fixed to the rear end of the rod 302, and a finger clamp 304 (bar holding member) mounted on the front end of the rod 302.

The blade part 303 is coupled to the endless chain C constituting the feeding rod driving means or the pushing means of the bar feeding machine. The endless chain C is hung around the driving sprocket and the driven sprocket (not shown), and the driving sprocket and the driven sprocket are rotatably mounted on the housing (not shown) of the bar feeding machine. The driving sprocket is connected to a power source such as an electric motor (not shown), and rotates with the action of the power source, so that the endless chain C moves in an endless manner. As the endless chain C moves in an endless manner, the blade part 303 coupled to the moving area of the endless chain C moves forward or backward. A belt and a pulley may also be used to replace the looped chain C.

The finger clamp 304 is supported at the front end of the rod 302 by a clamp joint 310 (connecting structure) provided at the front end area of the rod 302. The clamp joint 310 is fixed to the rod 302 and supports the finger clamp 304 to be rotatable.

The finger-shaped clamp 304 has a gripping portion 305 into which the rear end of a rod W (a rod with an outer diameter of 20 mm, 32 mm or 51 mm in this example) can be inserted, and the finger-shaped member 330 is rotatably accommodated in the gripping portion 305 to grip the rear end of the rod W. The finger-shaped member 330 has a cylindrical metal body 332. The cylindrical metal body 332 is provided with a through hole 332t that penetrates in a direction perpendicular to the axial direction, and three (three-divided) slit holes 332s that are evenly distributed in the circumferential direction and extend from the through hole 332t to the front end along the axial direction.

In this embodiment, the cylindrical metal body 332 is composed of cylindrical steel parts, SUJ materials, SCM, etc., as shown in Figure 10, for example, the outer diameter is 32mm, the inner diameter is 20mm, the length is 50mm, and a truncated cone-shaped opening 332a with a top angle of 60° and an opening diameter of 30mm connected to its internal space 332c is provided at one end. The through hole 332t is formed as a hole with a diameter of 6mm centered at a position 12mm away from the other end, and the width of the slit hole 332s is 1.5mm.

As shown in FIG. 10 , the clamp joint 310 has a rotating member 312 (rotating portion) disposed at the front portion and a fixed member 311 (fixed portion) disposed at the rear portion. The fixed member 311 of the clamp joint 310 is integrally fixed to the front end of the rod 302, and the rotating member 312 of the clamp joint 310 integrally supports the finger clamp 304.

More specifically, the gripping portion 305 of the finger-shaped clamp 304 has a diameter of 50 mm and a length of 78 mm, and a truncated cone-shaped opening 305a with a top angle of 96° and an opening diameter of 48 mm is provided on the front end. The truncated cone-shaped opening 305a is connected to the cylindrical space 305c with an inner diameter of 42 mm through a connecting portion 305b with an inner diameter of 26 mm and a length of 4 mm.

Furthermore, the finger-shaped member 330 is rotatably accommodated inside the cylindrical space 305c by means of a cylindrical roller bearing 333. Therefore, the rear end of the rod W can be inserted through the truncated cone-shaped opening 305a and the connecting portion 305b of the gripping portion 305, and the truncated cone-shaped opening 332a and the internal space 332c of the metal body 332.

In this example, the inner wall surface of the inner space 332c of the metal body 332 is formed into a smooth cylindrical surface without step differences or sections. However, as required, a plurality of rib-like protrusions extending in the axial direction and protruding inward in the radial direction may be formed on the inner wall surface. The diameter of the inner wall surface or the diameter of the inscribed circle of the front end of the rib-like protrusion is set to be slightly smaller than the outer diameter of the rod W.

The front end of the finger-shaped member 330 faces the rear end of the flange 305f (the part forming the connecting part 305b) of the gripping part 305, and the forward movement is restricted by the flange 305f. On the other hand, the rear part of the finger-shaped member 330 can also rotate relative to the front cylindrical opening of the rotating member 312 by means of a cylindrical roller bearing 335.

The rotating member 312 of the clamp joint 310 is connected to the shaft member 313 at the rear side and is screwed with the female thread portion at the rear side of the gripping portion 305 at the front side.

The rear portion of the shaft member 313 is inserted into the cylindrical opening of the fixed member 311 via the cylindrical roller bearing 317.

In addition, the female thread portion (not shown) protruding forward from the front end surface of the rod portion 302 is locked into the male thread portion 319 of the clamp joint 310 and locked.

Next, the operation of the feed rod 301 of this embodiment will be described.

The rear end of the rod W disposed on the rod feeding axis X-X is inserted into the truncated cone opening 305a and the connecting portion 305b of the gripping portion 305 and the truncated cone opening 332a and the internal space 332c of the metal body 332, and is embedded in the internal space 332c. The inner peripheral wall surface of the metal body 332 will slightly expand in diameter, and the rear end surface of the rod W will be elastically gripped by its elastic restoring force. In this way, the rear end of the rod W is elastically gripped by the finger-shaped member 330 of the finger-shaped clamp 304.

The front end of the rod W is inserted into, for example, an NC automatic lathe (not shown) and passed through the spindle inner tube of the NC automatic lathe. The spindle of the NC automatic lathe clamps the front end of the rod W with a collet chuck, and then rotates the rod W at high speed while cutting the outer periphery of the front end of the rod W with a turning tool.

The surrounding chain C continuously applies a predetermined thrust or driving force acting forward to the feed rod 301. However, since the shaft member 313 and the rotating member 312 can rotate relative to the fixed member 311 fixed to the rod 302, and the finger member 330 can also rotate relative to the gripping portion 305 fixed to the rotating member 312, the rear end of the high-speed rotating rod W will be supported by the feed rod 301 to be freely rotatable.

According to the feed rod 301 (rod feeding device) of the present embodiment as described above, since it does not require a cylindrical elastic body, there is no problem of the elastic body being damaged.

Furthermore, the inventor of this case has confirmed that the cylindrical metal body 332 can be elastically deformed due to the presence of the slit hole 332s, so the rear end of the rod W can be elastically and stably grasped.

In addition, the inventor of this case confirmed that the resistance of the cylindrical roller bearing 333 between the cylindrical metal body 332 and the gripping portion 305 can be maintained at a sufficiently low resistance. Thus, it was confirmed that the rod W can be stably supported and fed even when the rod W rotates at high speed through the rotation between the two and the rotation allowed by the rotation means of the clamp joint 310 (specifically, the cylindrical roller bearing 317).

<Fourth implementation form>

FIG. 11 is a schematic side view of the bar feeding device of the bar feeding machine of the fourth embodiment of the present invention, and FIG. 12 is a longitudinal cross-sectional view of the main part of the bar feeding device of the fourth embodiment of the present invention.

As shown in Figures 11 and 12, the bar feeding device of the bar feeding machine of the fourth embodiment of the present invention is a feed rod 401. The feed rod 401 also has: a rod 402 arranged on the bar feeding axis X-X of the bar feeding machine, a blade 403 integrally fixed to the rear end of the rod 402, and a finger clamp 404 (bar holding member) mounted on the front end of the rod 402.

The blade part 403 is coupled to the endless chain C constituting the feeding rod driving means or the pushing means of the bar feeding machine. The endless chain C is hung around the driving sprocket and the driven sprocket (not shown), and the driving sprocket and the driven sprocket are rotatably mounted on the housing (not shown) of the bar feeding machine. The driving sprocket is connected to a power source such as an electric motor (not shown), and rotates with the action of the power source, so that the endless chain C moves in an endless manner. As the endless chain C moves in an endless manner, the blade part 403 coupled to the moving area of the endless chain C moves forward or backward. A belt and a pulley may also be used to replace the looped chain C.

The finger clamp 404 is supported at the front end of the rod 402 by a clamp joint 410 (connecting member) provided at the front end area of the rod 402. The clamp joint 410 is fixed to the rod 402 and supports the finger clamp 404 to be rotatable.

The finger-shaped clamp 404 has a gripping portion 405 into which the rear ends of two rods W of different diameters (in this example, rods with outer diameters of 20 mm, 32 mm, or 51 mm, etc.) can be inserted. Two finger-shaped members 430 (a first finger-shaped member and a second finger-shaped member) are rotatably accommodated in the gripping portion 405 via cylindrical roller bearings 433 and 435, and can selectively grip the rear ends of two rods W of different diameters (a first rod and a second rod). The two finger-shaped members 430 have cylindrical metal bodies 432 and 462, respectively, and a cylindrical spacer 440 is disposed between the two. The two cylindrical metal bodies 432 and 462 are respectively provided with through holes 432t and 462t that penetrate in a direction perpendicular to the axial direction, and three (three-divided) slit holes 432s and 462s that are evenly distributed in the circumferential direction and extend from the through holes 432t and 462t to the front end along the axial direction.

In this embodiment, the two cylindrical metal bodies 432 and 462 are made of cylindrical steel members, SUJ materials, SCM, etc. The front cylindrical metal body 432 is as shown in FIG. 12, for example, with an outer diameter of 32 mm, an inner diameter of 24 mm, and a length of 50 mm, and a truncated cone-shaped opening 432a with a vertex angle of 60° and an opening diameter of 30 mm connected to the internal space 432c thereof is provided at one end. The through hole 432t is formed as a hole with a diameter of 6 mm centered at a position 12 mm from the other end, and the width of each slit hole 432s divided into three parts is 1.5 mm. The cylindrical metal body 462 on the rear side is shown in FIG12, for example, with an outer diameter of 32 mm, an inner diameter of 16 mm, and a length of 50 mm, and a truncated cone-shaped opening 462a with a top angle of 60° and an opening diameter of 30 mm connected to its internal space 462c is provided at one end. The through hole 462t is formed as a hole with a diameter of 6 mm centered at a position 12 mm from the other end, and the width of each slit hole 462s divided into three parts is 1.5 mm.

As shown in FIG. 12 , the clamp joint 410 has a rotating member 412 (rotating portion) disposed at the front portion and a fixed member 411 (fixed portion) disposed at the rear portion. The fixed member 411 of the clamp joint 410 is integrally fixed to the front end of the rod 402, and the rotating member 412 of the clamp joint 410 integrally supports the finger clamp 404.

More specifically, the gripping portion 405 of the finger-shaped clamp 404 has a diameter of 50 mm and a length of 112 mm, and a truncated cone-shaped opening 405a with a top angle of 96° and an opening diameter of 48 mm is provided on the front end. The truncated cone-shaped opening 405a is connected to the cylindrical space 405c with an inner diameter of 42 mm through a connecting portion 405b with an inner diameter of 26 mm and a length of 4 mm.

Furthermore, the cylindrical metal body 432 on the front side is rotatably accommodated inside the cylindrical space 405c via the cylindrical roller bearing 433. Therefore, the rear end of the rod W can be inserted through the truncated cone-shaped opening 405a and the connecting part 405b of the gripping part 405, and the truncated cone-shaped opening 432a and the internal space 432c of the metal body 432.

In this example, the inner wall surface of the inner space 432c of the metal body 432 is formed into a smooth cylindrical surface without step differences or sections. However, as required, a plurality of rib-like protrusions extending along the axial direction and protruding inward in the radial direction can be formed on the inner wall surface. The diameter of the inner wall surface or the diameter of the inscribed circle of the front end of the rib-like protrusion is set to be slightly smaller than the outer diameter of the rod W.

The front end of the cylindrical metal body 432 on the front side faces the rear end of the flange 405f (the part forming the connecting part 405b) of the grip 405, and the forward movement is restricted by the flange 405f. On the other hand, the cylindrical metal body 462 on the rear side can rotate relative to the front cylindrical opening of the rotating member 412 via the cylindrical roller bearing 435.

The rotating member 412 of the clamp joint 410 is connected to the shaft member 413 at the rear side and is screwed with the female thread portion at the rear side of the gripping portion 405 at the front side.

The rear portion of the shaft member 413 is inserted into the cylindrical opening of the fixed member 411 via the cylindrical roller bearing 417.

In addition, the female thread portion (not shown) protruding forward from the front end of the rod portion 402 is locked into the male thread portion 419 of the clamp joint 410 and locked.

Next, the operation of the feed rod 401 of this embodiment will be described.

The rear end of the rod W disposed on the rod feeding axis X-X is inserted into and received by the truncated cone opening 405a and the connecting portion 405b of the gripping portion 405 and the truncated cone openings 432a, 462a and the internal spaces 432c, 462c of the metal bodies 432, 462, and is embedded in the internal spaces 432c, 462c. The inner peripheral wall surface of the metal body 462 slightly expands in diameter, and the rear end surface of the rod W is elastically gripped by its elastic restoring force. In this way, the rear end of the rod W is elastically gripped by the metal body 462 on the rear side of the finger-shaped member 430 of the finger-shaped clamp 404. Alternatively, when the diameter of the rod W is larger, the rear end of the rod W disposed on the rod feeding axis X-X is inserted by the truncated cone-shaped opening 405a and the connecting portion 405b of the gripping portion 405 and the truncated cone-shaped opening 432a and the internal space 432c of the metal body 432, and is embedded in the internal space 432c. The inner peripheral wall surface of the metal body 432 will slightly expand in diameter, and the rear end surface of the rod W will be elastically gripped by its elastic restoring force. In this way, the rear end of the rod W is elastically gripped by the metal body 432 on the front side of the finger-shaped member 430 of the finger-shaped clamp 404. In this way, the finger-shaped member 430 of this embodiment can correspond to two diameters of the rod W.

In terms of control, it is confirmed in advance which finger-shaped member 430 (metal body 432 or metal body 462) the bar W to be supplied should be inserted into, and then the feed rod 401 is moved so that the rear end of the bar W reaches the desired position, and the bar W can be inserted into the corresponding finger-shaped member 430 (metal body 432 or metal body 462).

Then, the front end of the rod W is inserted into, for example, an NC automatic lathe (not shown) and inserted through the spindle inner tube of the NC automatic lathe. The spindle of the NC automatic lathe clamps the front end of the rod W with a collet chuck, and then the rod W is rotated at high speed, while the outer periphery of the front end of the rod W is cut with a turning tool.

The surrounding chain C continuously applies a predetermined thrust or driving force acting forward to the feed rod 401. However, since the shaft member 413 and the rotating member 412 can rotate relative to the fixed member 411 fixed to the rod 402, and the finger member 430 can also rotate relative to the gripping portion 405 fixed to the rotating member 412, the rear end of the high-speed rotating rod W will be supported by the feed rod 401 to be freely rotatable.

According to the feed rod 401 (rod feeding device) of the present embodiment as described above, since it does not require a cylindrical elastic body, there is no problem of the elastic body being damaged.

Furthermore, the inventor of this case has confirmed that the cylindrical metal bodies 432 and 462 can be elastically deformed due to the presence of the three slit holes 432s and 462s, so the rear end of the rod W can be elastically and stably grasped.

In addition, the inventor of this case confirmed that the resistance of the cylindrical roller bearing 433 between the cylindrical metal body 432 and the gripping portion 405 can be maintained at a sufficiently low resistance. Thus, it was confirmed that the rod W can be stably supported and fed even when the rod W rotates at high speed through the rotation between the two and the rotation allowed by the rotation means of the clamp joint 410 (specifically, the cylindrical roller bearing 417).

In the bar feeding device (feed rod 401) of the bar feeding machine of the fourth embodiment, two finger-shaped members 430 (first finger-shaped member and second finger-shaped member) respectively have cylindrical metal bodies 432 and 462, and the cylindrical metal bodies 432 and 462 respectively have through holes 432t and 462t that penetrate in a direction perpendicular to the axial direction, and three (three-divided) slit holes 432s and 462s that extend from the through holes 432t and 462t to the front end in the axial direction and are evenly distributed in the circumferential direction. However, each of the two finger-shaped members 430 may also include a cylindrical elastic body and a cylindrical metal body covering the cylindrical elastic body (refer to the bar feeding device (feed rod 101) of the bar feeding machine of the first embodiment shown in FIGS. 1 to 4). In this case, since the cylindrical elastic body of the two finger-shaped members 430 is covered by the cylindrical metal body, the situation where the cylindrical elastic body is damaged can be effectively suppressed. On the other hand, since the frictional sliding resistance between the cylindrical metal body covering the cylindrical elastic body and the holding portion 405 of the rod holding member can be maintained at a sufficiently low resistance by the cylindrical roller bearing 433, etc., the rod W can be stably supported and fed even when the rod W rotates at a high speed by the rotation between the two and the rotation allowed by the rotating means of the clamp joint 410 (specifically, the cylindrical roller bearing 417). That is, even in this case, these finger-shaped members can be selectively used for two rods of different diameters.

Alternatively, one of the two finger-shaped members 430 (the first finger-shaped member and the second finger-shaped member) may have a cylindrical metal body having a through hole extending in a direction perpendicular to the axial direction and three (three-divided) slit holes evenly distributed in the circumferential direction extending from the through hole in the axial direction to the front end, while the other of the two finger-shaped members 430 may have a cylindrical elastic body and a cylindrical metal body covering the cylindrical elastic body. In this case, these finger-shaped members may also be selectively used for two rods of different diameters.

In addition, the number of finger-shaped members 430 provided in the gripping portion 405 is not limited to two, and may be three or more. In this case, these finger-shaped members may be selectively used for three or more rods of different diameters.

104: Finger clamp

105:Handling part

105a: truncated cone-shaped opening

105b: Connection part

105c: Cylindrical space

105f: flange

110: Clamp connector

111:Fixed components

111a: Front opening

112: Rotating component

112a: Hollow cylindrical part

112f: flange

113: Shaft components

114: Sales

115: Back-end expansion

116: Ring-shaped shoulder

117: Steel Ball

118:Steel ball support part

119: Female screw thread

130: Finger-shaped component

131: Elastic body

131a: truncated cone-shaped opening

131c:Interior space

132:Metal body

135: Area (area for accommodating rotating objects)

Claims (4)

A bar feeding device of a bar feeding machine is used to rotatably support a bar that rotates during cutting processing. The bar feeding device is equipped with: a bar holding member that holds the rear end of the bar; a rod that advances when feeding the bar; and a connecting member that is arranged between the bar holding member and the rod and supports the bar holding member to be rotatable; wherein the connecting member has: a rotating part that integrally supports the bar holding member, a fixed part connected to the rod, and a connecting member that connects the rotating part The rotating means connected to the aforementioned fixed part to be relatively rotatable; the aforementioned rod holding member comprises: a holding part and a finger-shaped member; the holding part comprises a hollow part that can receive the rear end of the rod; the finger-shaped member is rotatably accommodated in the holding part and holds the rear end of the aforementioned rod; the aforementioned finger-shaped member comprises: a cylindrical elastic body and a cylindrical metal body covering the cylindrical elastic body; the aforementioned cylindrical elastic body is a cylindrical elastic body; the aforementioned cylindrical metal body is a cylindrical metal body. A bar feeding device of a bar feeding machine is used to rotatably support a first bar or a second bar that rotates during cutting. The bar feeding device comprises: a bar holding member that holds the rear end of the first bar having a first diameter or the second bar having a second diameter different from the first diameter; a rod that advances when feeding the bar; and a connecting member that is arranged between the bar holding member and the rod and supports the bar holding member so that it can rotate; wherein the connecting member comprises: a rotating part that integrally supports the bar holding member, a fixed part that is connected to the rod, and a connecting member that connects the rotating part and the fixed part so that they can rotate relative to each other. The rod holding member comprises: a holding portion, a first finger-shaped member and a second finger-shaped member; the holding portion has a hollow portion that can receive the rear end of the first rod or the second rod; the first finger-shaped member is rotatably received in the holding portion and can hold the rear end of the first rod; the second finger-shaped member is rotatably received in the holding portion and can hold the rear end of the second rod; the first finger-shaped member and the second finger-shaped member each have a cylindrical metal body, and each cylindrical metal body is provided with: a through hole that penetrates in a direction perpendicular to the axial direction, and a slit hole extending from the through hole to the front end in the axial direction. A bar feeding device of a bar feeding machine is used to rotatably support a first bar or a second bar that rotates during cutting processing. The bar feeding device is equipped with: a bar holding member that holds the rear end of the first bar having a first diameter or the second bar having a second diameter different from the first diameter; a rod that advances when feeding the bar; and a connecting member that is arranged between the bar holding member and the rod and supports the bar holding member to be rotatable; wherein the connecting member has: a rotating part that integrally supports the bar holding member, a fixed part connected to the rod, and a connecting member that connects the rotating part to the rod. The movable part is connected to the aforementioned fixed part to form a rotating means that can rotate relatively; the aforementioned rod holding member comprises: a holding part, a first finger-shaped member and a second finger-shaped member; the holding part has a hollow part that can accept the insertion of the rear end of the first rod or the second rod; the first finger-shaped member is rotatably accommodated in the holding part and can hold the rear end of the aforementioned first rod; the second finger-shaped member is rotatably accommodated in the holding part and can hold the rear end of the aforementioned second rod; the aforementioned first finger-shaped member and the aforementioned second finger-shaped member each comprise: a cylindrical elastic body and a cylindrical metal body covering the cylindrical elastic body. A bar feeding device of a bar feeding machine is used to rotatably support a first bar or a second bar that rotates during cutting processing. The bar feeding device is equipped with: a bar holding member that holds the rear end of the first bar having a first diameter or the second bar having a second diameter different from the first diameter; a rod that advances when feeding the bar; and a connecting member that is arranged between the bar holding member and the rod and supports the bar holding member so that it can rotate; wherein the connecting member has: a rotating part that integrally supports the bar holding member, a fixed part connected to the rod, and a rotating means that connects the rotating part and the fixed part so that they can rotate relative to each other; the bar holding member has: a holding part, a first finger-shaped structure The first finger-shaped member and the second finger-shaped member; the holding portion has a hollow portion that can accept the insertion of the rear end of the first rod or the second rod; the first finger-shaped member is rotatably accommodated in the holding portion and can hold the rear end of the aforementioned first rod; the second finger-shaped member is rotatably accommodated in the holding portion and can hold the rear end of the aforementioned second rod; one of the aforementioned first finger-shaped member and the aforementioned second finger-shaped member has a cylindrical metal body, and the cylindrical metal body is provided with: a through hole passing through in a direction perpendicular to the axial direction, and a slit hole extending from the through hole to the front end in the axial direction; the other of the aforementioned first finger-shaped member and the aforementioned second finger-shaped member has: a cylindrical elastic body, and a cylindrical metal body covering the cylindrical elastic body.

Images