JP2006075953A - Chip discharging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact chip discharging device capable of improving working efficiency of chips, capable of improving separating efficiency of cutting oil, and capable of saving an installation space with a simple structure. <P>SOLUTION: A chip conveyance screw conveyor 6 and a chip compression screw conveyor 7 are provided on the upstream side and the downstream side of the chips A, the screw conveyors 6 and 7 are connected, the screw conveyor 6 is housed in a conveyance case 3 and the screw conveyor 7 is housed in a compression case 8, a lid 10 is provided on a chip discharge port 9 side of the compression case 8, and a driving source M connected to the chip compression screw conveyor 7 is provided on the opposite side from the chip discharge port 9 with respect to the lid 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chip discharging apparatus that compresses chips generated from a cutting machine, a drilling machine, and the like to reduce the volume, and discharges a certain amount of chips with the reduced volume.

Conventionally, as an apparatus for discharging chips generated from a cutting machine, a drilling machine, or the like, for example, there is one disclosed in JP-A-10-58273.

This apparatus has a screw conveyor, and the taken-in chips are collected by being conveyed by the screw conveyor and discharged to an external collection box through a discharge port.
JP-A-10-58273

  However, in the above prior art, when the amount of chips per unit time increases as the processing efficiency on the processing machine side increases, the chip collection box becomes full in a short time.

  As a result, the processing operation of the collection box filled with the chips must be frequently performed, and eventually the processing efficiency of the chips is lowered.

  In addition, the amount of cutting oil taken out together with the chips increases, and the cutting oil cannot be sufficiently separated from the chips, so that the separation efficiency of the cutting oil also decreases.

  In order to solve this problem, there is an idea to install a chip compression / solidification device, but the installation space increases, and the entire device becomes complicated and large.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a chip discharging device that improves chip processing efficiency, improves cutting oil separation efficiency, saves installation space, and is simple in configuration and compact.

In order to solve the above problems, the present invention provides:
A chip conveying screw conveyor 6 and a chip compressing screw conveyor 7 are provided on the upstream side and the downstream side of the chip A, and both are connected to each other, with the former being a conveying case 3 and the latter being a compressing case 8 respectively. A lid 10 is provided on the chip discharge port 9 side of the compression case 8, and a drive source M connected to the chip conveyor screw conveyor 7 is provided on the opposite side of the lid 10 from the chip discharge port 9. The technical means of the chip discharging apparatus 1 characterized by this is taken.

  According to the configuration of the present invention described above, if the chip discharging device 1 according to the present invention is provided in a state inclined in the vertical direction with respect to the oil tank 2 (FIG. 1), for example, a cutting machine, a drilling machine, etc. When the chip A generated from the processing section 18 is taken into the transport case 3 via the chip intake 4, the chip A is transported from the upstream side to the downstream side by the chip conveyor 6 and enters the compression case 8. The chip A is compressed and crushed in the compression case 8 by the chip conveyor 7 for compressing the chip. As a result, the chip A is crushed in the compression case 8 (FIG. 4A). Therefore, the amount of the chip D that is crushed in the compression case 8 gradually increases (FIG. 4B), and the crushed chip D. Side compression force (FIG. 4C), the lid 10 side When the power is overcome, the lid 10 moves backward, the chip discharge port 9 opens, and a certain amount of the chip D whose volume is reduced by being crushed is collected in the collection box 17 through the chip discharge port 9. By extending the time when the collection box 17 becomes full, the frequency of processing the collection box 17 filled with the chips D is reduced, and the processing efficiency of the chips D is improved.

  Further, if the chip A is compressed in the compression case 8, the cutting oil B adhering to the chip A is separated (FIG. 4A), and the amount of the chip D that is compressed and crushed increases. Then, the amount of the cutting oil B separated in proportion to it increases (FIG. 4 (B)), and the separated cutting oil B moves up and down in the direction opposite to the lid 10 (FIG. 4 (C)). The oil is recovered in the oil tank 2 (FIG. 1) by flowing from the compression case 8 side inclined in the direction to the transport case 3 side and dropping from numerous holes (not shown) formed in the transport case 3. Thereby, the amount of the cutting oil B taken out together with the chips D (FIG. 4C) is reduced, and the separation efficiency of the cutting oil B is improved.

  Further, the chip conveying screw conveyor 6 and its conveying case 3, the chip compressing screw conveyor 7 and the compressing case 8 are integrated into a single drive source M without providing a chip compressing / solid device. Since the conveyors 6 and 7 can be driven, the installation space is saved, and the configuration of the entire apparatus can be easily and compactly integrated.

  Therefore, according to the present invention, it is possible to provide a chip discharge device that improves chip processing efficiency, improves cutting oil separation efficiency, saves installation space, and has a simple and compact configuration. Is possible.

Hereinafter, the present invention will be described with reference to the accompanying drawings by embodiments.
FIG. 1 is an overall view showing an embodiment of the present invention.

  In FIG. 1, an oil tank 2 is installed below a processing unit 18 such as a cutting machine or a drilling machine. The oil tank 2 is provided with a chip discharging device 1 according to the present invention.

  As shown in the figure, the chip discharge device 1 has a cylindrical conveyance case 3 and a compression case 8 that are inclined in the vertical direction and whose cross-sectional shape is, for example, rectangular, and the length (axis C direction) is the former. 3 is relatively large and the latter 8 is relatively small.

  And with respect to the chip A mentioned later, the conveyance case 3 is arrange | positioned in the upstream, and the compression case 8 is each arrange | positioned in the downstream, and the chip A generated in the said process part 18 in the conveyance case 3 is each. In the compression case 8, the chip A sent from the conveyance case 3 side is compressed to reduce its capacity.

  One end 3A side located above the transport case 3 is fixed to the opening 2A of the oil tank 2, and the other end 8A of the compression case 8 is joined to the one end 3A. 8 protrudes outward from the oil tank 2.

  Further, the other end 3B side of the lower side of the transport case 3 is disposed inside the oil tank 2, and a chip intake 4 is provided on the other end 3B side, which is generated in the processing unit 18. The cut chips A are taken into the transport case 3.

  The conveying case 3 and the compression case 8 accommodate a chip conveying screw conveyor 6 and a chip compressing screw conveyor 7, respectively, and both are connected.

  The two conveyors 6 and 7 are relatively large and the conveyor 7 is relatively small according to the length of the conveyance case 3 and the compression case 8 in the axis C direction.

  In the illustrated example, the lid 10 described later slightly enters the compression case 8 side for structural reasons, so that the chip compression screw conveyor 7 slightly enters the transport case 3 side. It is possible to completely store the conveyors 6 and 7 in the corresponding cases 3 and 8 by reducing the length of the compression case 8 or extending the compression case 8 to the conveyance case 3 side.

The chips conveying screw conveyor 6, for example by Mujiku spiral Rushafuto 6A, chips compression screw conveyor 7 are each composed by perforated axial spiral Rushafuto 7A, for example.

Mujiku spiral Rushafuto 6A is (FIG. 2) has a head portion 6B, the head portion 6B, joining the axis 7B of Yujiku spiral Rushafuto 7A, one end 6A1 of the radio axis spiral Rushafuto 6A is Yujiku spiral Rushafuto is bound with 7A at the other end 7A1, thereby, is connected directly to the Mujiku spiral Rushafuto 6A and Yujiku spiral Rushafuto 7A.

With this configuration, by rotating the closed axial spiral Rushafuto 7A through a drive source M to be described later, the rotational movement of the organic shaft spiral Rushafuto 7A is smoothly transmitted to Mujiku spiral Rushafuto 6A, Mujiku spiral Rushafuto 6A and Yujiku spiral Rushafuto 7A is adapted to rotate at the same speed together.

Further, the other end 6A2 side Mujiku spiral Rushafuto 6A, supported by a supporting member 5 fixed to the other end 3B of the transport case 3, the radio axis spiral Rushafuto 6A is so as not to pulsation when the rotation .

Mujiku spiral Rushafuto 6A is placed in contact with the lower surface 3C of the transfer case 3, between the upper surface 3D, a gap is formed, Yujiku spiral Rushafuto 7A includes a lower surface 8C of the compression casing 8 Both are arranged in contact with the upper surface 8D.

  As a result, as shown in the figure, an extremely wide space is formed in the transport case 3 as compared with the inside of the compression case 8, and conversely, the bias in the compression case 8 is compared with that in the transport case 3. A very narrow space is formed between the lid 10 and the lid 10.

Further, the pitch L ₁ of Mujiku spiral Rushafuto 6A whereas relatively large, the pitch L ₂ of Yujiku spiral Rushafuto 7A is relatively small, therefore, chips A sent by Mujiku spiral Rushafuto 6A is more sent fast, chips a sent by Yujiku spiral Rushafuto 7A is adapted to be fed more slowly.

With this configuration, in the inside carrying case 3 (FIG. 4 (A)), by Mujiku spiral Rushafuto 6A to rotate, more capacity is large chips A is sent to the compression case 8 side is conveyed faster, the in the compression case 8, by Yujiku spiral Rushafuto 7A rotating at the same speed, by該切powder a is sealed in the narrow space is compressed slowly strong force, crushed by the the transport case 3 Chip D having a smaller volume than chip A is formed.

  Therefore, in the compression case 8 (FIG. 4 (B)), the amount of the chip D to be crushed gradually increases, and the compression force on the chip D side overcomes the biasing force on the lid 10 side described later. The lid 10 is retracted (FIG. 4 (C)), the chip discharge port 9 is opened, and a fixed amount of the chip D having a reduced volume is discharged and recovered in the recovery box 17 (FIG. 1). The

  Therefore, since only a certain amount of chips D with a reduced volume are collected in the collection box 17, according to the present invention, the time during which the collection box 17 is full is extended, and thus the chips are filled with chips. Further, the frequency of processing the collection box 17 is reduced, and the processing efficiency of the chips is improved.

  In this case, when the chip A is compressed and crushed in the compression case 8, the cutting oil B is separated from the crushed chip D. However, the compression case 8 and the transport case 3 are both Since it is inclined (FIG. 1), the separated cutting oil B (FIGS. 4A to 4C) flows to the conveyance case 3 side opposite to the lid 10, and as described above. In addition, the oil is recovered in the oil tank 2 (FIG. 1) through innumerable holes (not shown) formed in the transfer case 3.

  Accordingly, the amount of the cutting oil B taken out together with the chips D (FIG. 4C) is reduced, and according to the present invention, the separation efficiency of the cutting oil B is also improved.

  On the other hand, a chip discharge port 9 is formed at one end 8A of the compression case 8 (FIG. 2), and a biased lid 10 is provided at the chip discharge port 9.

  In this case, the lid 10 normally closes the chip discharge port 9 as illustrated.

  The biasing means of the lid 10 is constituted by, for example, a coil spring 11, and one end 11A of the coil spring 11 abuts on a flange 13 described later, and the other end 11B abuts on a spring receiver 20 inside the lid 10, The spring receiver 20 is screwed to the lid 10 via a stud 21.

  With this configuration, as described above, when the compression force on the chip D side compressed and crushed in the compression case 8 (FIG. 4C) overcomes the urging force on the lid 10 side, the lid 10 is coiled. The chip 11 retreats against the restoring force of the spring 11, thereby opening the chip discharge port 9 that has closed the compression case 8, and a certain amount of chip D whose volume is reduced by being crushed is collected in the collection box 17. .

  The flange 13 with which one end 11A of the coil spring 11 is in contact (FIG. 3) is connected to both sides of the compression case 8 via the plate 19 on both sides (Y-axis direction). It is screwed to a bearing housing 14 (FIG. 2) described later.

  In this case, the said board 19 (FIG. 3), the compression case 8, and the board 19 and the flange 13 are joined by welding, for example.

The shaft 7B chromatic axial spiral Rushafuto 7A (FIG. 2) is, chip discharge port 9 side is not tapered, portion adapted its thinner is, through the lid 10 and the coil spring 11, via the connecting shaft 12 And connected to the rotary shaft 15 of the drive source M.

  The left side of the connecting shaft 12 is disposed on the flange 13 side, and the right side of the connecting shaft 12 is rotatably supported with respect to the bearing 22, and the bearing 22 is built in the bearing housing 14.

  In this case, the flange 13 is attached to the front end (left side) of the bearing housing 14, and the flange 13 covers the entire projecting coupling shaft 12 as shown in the figure, so that a bearing 22 built in the bearing housing 14 is provided. The bearing 22 is protected by preventing dust and the like from adhering to the surface.

A drive source M is attached to the rear end (right side) of the bearing housing 14 via an attachment portion 16. The drive source M is, for example, a hydraulic motor M, and the rotary shaft 15 of the hydraulic motor M is as already described, through the connecting shaft 12, and connected to the shaft 7B of Yujiku spiral Rushafuto 7A.

Therefore, if operation of the hydraulic motor M, the hydraulic motor M rotating shaft 15 is rotated, its rotational movement is transmitted via the connecting shaft 12 to the shaft 7B of the chromatic axial spiral Rushafuto 7A, the shaft 7B rotational movement via the head 6B, is transmitted to Mujiku spiral Rushafuto 6A, thereby, the single driving source M, both spiral Rushafuto 6A, 7A rotates.

  Thus, the chip conveying screw conveyor 6 and its conveying case 3, the chip compressing screw conveyor 7 and the compression case 8 are integrated into one drive without providing a chip compressing / solid device. By enabling the conveyors 6 and 7 to be driven by the source M, according to the present invention, the installation space is saved, whereby the overall configuration of the apparatus is simple and compact.

  Further, according to the example of FIG. 2, the chip conveyor screw conveyor 6 and its conveyor case 3, the chip compressor screw conveyor 7 and compressor case 8, the lid 10, the biasing means 11, and the drive source M are all coaxial. Since it is installed above, the installation space is further saved, and the configuration of the entire apparatus is further simplified and compactly integrated.

  In addition, although the coil spring 11 was explained in full detail as the biasing member of the said lid | cover 10, it is not limited to it, A fluid cylinder etc. may be sufficient.

The operation of the present invention having the above configuration will be described below with reference to FIG.
(1) The conveying operation of the chip A.

In this case, by operating the hydraulic motor M wherein a drive source M (FIG. 1), the advance by rotating the non-axial spiral Rushafuto 6A and Yujiku spiral Rushafuto 7A.

In this state, chips A produced from the processing unit 18, when incorporated into the transport case 3 via the Setsukoto inlet 4, by rotating Mujiku spiral Rushafuto 6A (FIG. 4 (A)), more capacity Large chips A are conveyed faster and sent to the compression case 8 side.

In this case, chips A, since sent from the broader transport case 3 narrower compression casing 8, at the entrance near the compression case 8, it is possible to stop bitten, in that time, spiral Rushafuto 6A, 7A It reversed the Remove the chips D was bitten by, if normal rotation spiral Rushafuto 6A, the 7A again, chips D is to be conveyed into the compression case 8.
(2) Chip A compression operation.

Thus, within the compression case 8, by Yujiku spiral Rushafuto 7A rotating at the same speed, by volume is greater chips A are confined within a narrow space is compressed slowly strong force, the compressed In the case 8, chips D are formed which are crushed and have a smaller volume than the chips A in the transport case 3.

  In this state, when the chips A are sent from the conveyance case 3 side, the amount of the chips D that are compressed and crushed in the compression case 8 gradually increases (FIG. 4B).

Therefore, when the compressive force on the side of the chip D to be crushed overcomes the urging force on the side of the lid 10 that closes the chip discharge port 9 (FIG. 4C), the lid 10 moves backward to discharge the chip. When the outlet 9 is opened, a certain amount of chips D that have been crushed and reduced in volume are discharged and collected in the collection box 17 (FIG. 1).
(3) Separation operation of the cutting oil B.

The compression case within 8 in (FIG. 4 (A)), by Yujiku spiral Rushafuto 7A to rotate, crushed are compressed volume is large chips A, the chips D, and the volume was reduced is formed, at the same time Then, the cutting oil B attached to the chips D is separated.

  Then, the cutting oil B flows from the inclined compression case 8 to the conveyance case 3.

  In this state, when the amount of chip D to be crushed gradually increases (FIG. 4B), the amount of cutting oil B that is separated in proportion thereto also increases, and the increased cutting oil B is similarly conveyed. The compressive force on the chip D side that flows to the case 3 side and is crushed overcomes the urging force on the lid 10 side closing the chip discharge port 9 (FIG. 4C), and the chip discharge port 9 Since the compressed case 8 and the conveying case 3 are inclined even if the chip D that has been crushed and reduced in volume is discharged, the separated cutting oil B is opposite to the lid 10. It flows to the conveyance case 3 side.

  In this way, the cutting oil B that has flowed to the conveying case 3 falls through numerous holes (not shown) formed in the conveying case 3 and is collected in the oil tank 2 (FIG. 1). .

  FIG. 5 is a view showing a second embodiment of the present invention. The first embodiment of FIG. 2 is different from the first embodiment in that a groove-like recess 22 along the longitudinal direction (X-axis direction) is formed on the inner surface of the compression case 8. Different points are provided.

The inner surface of the compression casing 8 (Fig. 5), between the chips D, may frictional resistance is small, in that case, be該切powder D is rotated together with the Yujiku spiral Rushafuto 7A is there.

  As a result, the chips D do not collect in the vicinity of the front surface 10A of the lid 10 and do not exert a compressive force to overcome the biasing force on the lid 10 side closing the chip discharge port 9.

  Therefore, as described above, the inner surface of the compression case 8 is provided with a recess 22 in order to increase the frictional resistance with the chips D so that the chips D do not rotate and accumulate near the front surface 10A of the lid 10. Thus, the chip D with increased compressive force retracts the lid 10 and opens the chip discharge port 9.

  In this case, in order to increase the frictional resistance, in addition to the concave portion 22, a convex portion along the longitudinal direction (X-axis direction) protruding from the inner surface of the compression case 8 is provided opposite to the concave portion 22. You can also.

  FIG. 6 is a view showing a third embodiment of the present invention, which is different from the first embodiment of FIG. 2 and the second embodiment of FIG. Is different.

With this configuration, chips D in the compression casing 8 is mashed between Yujiku spiral Rushafuto 7A and fixed lid 10 which rotates by being comminuted, volume decreases.

Then, the crushed in chips D the volume is reduced, the gap 23 formed between the shaft 7B of Yujiku spiral Rushafuto 7A, and is adapted to discharge to the outside.

  That is, this gap 23 is used as an opening for discharging chips.

  As a result, the lid 10 is cut as shown in FIG. 6 in comparison with a complicated configuration in which the lid 10 is biased by the coil spring 11 (FIGS. 2 and 5) and the chip discharge port 9 is urged. A very simple configuration of fixing to the powder discharge port 9 can be realized, and the cost can be reduced accordingly.

FIG. 7 is a diagram showing a fourth embodiment of the present invention. The third embodiment of FIG. 6 is different from the third embodiment in that the lid 10 is fixed to the chip discharge port 9 of the compression case 8. Although common, chips compression screw conveyor 7, and that it is configured by Mujiku spiral Rushafuto 7C, the point having a hole 24 and 25 for chip discharge the lid 10 to the compression casing 8 is different.

This configuration, as shown in FIG. 6, the chips compression screw conveyor 7 as compared with the case of configuring a Yujiku spiral Rushafuto 7A, FIG. 7, the space in the compression casing 8 is made wider, with it, The capacity of the chips D entering the compression case 8 is increased.

  In addition to the gap 23, the chips D are discharged through the chip discharge holes 24 and 25, and the discharge amount is also increased.

Figure 8 is a diagram showing a fifth embodiment of the present invention, the fourth embodiment of FIG. 7, in that the chips compression screw conveyor 7 is constituted by Mujiku spiral Rushafuto 7C, the common Suruga, the lid 10 (FIG. 8), fixed to Mujiku spiral Rushafuto 7C side, also, a sliding split groove 26, that is provided to the compression case 8 side is different.

That is, when thus securing the lid 10 to the chip discharge port 9, the frictional heat between the lid 10 and the chips D that the fixed occurs, as that amount Mujiku spiral Rushafuto rotational energy of 7C heat wastefully consumed, rotational energy of the radio axis spiral Rushafuto 7C would not be effectively used to grind the chips D.

Accordingly, as shown in FIG. 8, the chip discharge port 9 side of Mujiku spiral Rushafuto 7C, by fixing the lid 10, while rotating the lid 10 with Mujiku spiral Rushafuto 7C, ground the chips D and collapsing manner, to prevent the occurrence of frictional heat, by effectively using the rotational energy of the radio axis spiral Rushafuto 7C, it was decided to improve the grinding efficiency of the chips D.

  Further, in FIG. 8, since the amount of discharge is too small just by discharging the chips D from the gap between the lid 10 and the compression case 8, as described above, by providing the slit groove 26, the slot groove 26 is provided. The discharge amount of the chips D is increased by enabling the discharge of the chips D from 26.

Further, in FIG. 8, Mujiku spiral Rushafuto 7C has a head 7D, head portion 7D, for example via a connecting shaft (not shown) and sprocket chains mechanism (not shown), is a drive source It is connected to the motor.

In FIG 8, although chips compression screw conveyor 7 is constituted by Mujiku spiral Rushafuto 7C, when configured by Yujiku spiral Rushafuto, i.e., chips conveying screw conveyor 6 (Fig. 2) There the Mujiku spiral Rushafuto 6A, chips compression screw conveyor 7 may be constituted by Yujiku spiral Rushafuto 7A.

  As described above, the present invention improves the chip processing efficiency, improves the cutting oil separation efficiency, saves installation space, and is used in a chip discharge device that is simple and compact in configuration. Specifically, it is useful for a processing machine that generates chips during processing, such as a cutting machine or a drilling machine.

1 is an overall view showing an embodiment of the present invention. It is a figure which shows 1st Example of the chip discharge apparatus 1 by this invention. FIG. 3 is a detailed view of FIG. 2. It is operation | movement explanatory drawing of this invention. It is a figure which shows 2nd Example of this invention. It is a figure which shows 3rd Example of this invention. It is a figure which shows 4th Example of this invention. It is a figure which shows 5th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chip discharge device 2 Oil tank 3 Carrying case 4 Chip intake 5 Support member 6 Screw conveyor for chip conveyance 7 Screw conveyor for chip compression 8 Compression case 9 Chip discharge port 10 Lid 11 Energizing means 12 Connecting shaft 13 Flange 14 Bearing housing 15 Rotating shaft 16 Drive source mounting portion 17 Collection box 18 Processing portion 19 Plate 20 Spring receiver 21 Stud 22 Recess 23 Clearance 24, 25 Chip discharge hole 26 Slot groove A Cutting powder B Cutting oil C Axis D Chips that have been crushed and reduced in volume

Claims (10)

A chip conveyor for conveying chips and a screw conveyor for compressing chips are provided on the upstream side and downstream side of the chips, and both are connected, and the former is stored in the transport case and the latter is stored in the compression case. A chip discharging apparatus characterized in that a lid is provided on the powder discharge port side, and a drive source connected to a screw conveyor for chip compression is provided on the side opposite to the chip discharge port with respect to the lid. Regarding the length of the chip conveying screw conveyor and the conveying case, and the axial length of the chip compressing screw conveyor and the compressing case, the former is relatively large, the latter is relatively small, and the chip conveying screw conveyor is conveyed. 2. The chip conveyor is disposed so as to contact the lower surface of the case, and a gap is formed between the upper surface and the screw conveyor for chip compression. The chip discharging apparatus as described. The chip discharge device according to claim 1, wherein the lid is urged or fixed to the chip discharge port, or the cover is fixed to a chip discharge port side of a screw conveyor for chip compression. When the lid is urged against the chip discharge port, the chip conveyor screw conveyor is driven by a non-axial spirer, the chip compressor screw conveyor is driven by an axial spirer, and the lid biasing member is a coil. 4. The chip discharging apparatus according to claim 3, wherein the drive source is constituted by a hydraulic motor by a spring. The chip discharging apparatus according to claim 4, wherein the former is relatively large and the latter is relatively small with respect to the pitch of the non-axial spira and the axial spira. The chip discharging apparatus according to claim 4, wherein the shaft of the shafted spiraer passes through a lid and a coil spring and is connected to a rotating shaft of a hydraulic motor via a connecting shaft. The chip discharging apparatus according to claim 4, wherein one end of the coil spring is in contact with the lid and the other end is in contact with a flange on the hydraulic motor side. The chip discharging apparatus according to claim 4, wherein a concave portion or a convex portion along the longitudinal direction is provided on an inner surface of the compression case storing the axial spira. When the lid is fixed with respect to the chip discharge port, the chip conveying screw conveyor is constituted by an axisless spira, and the chip compressing screw conveyor is constituted by an axial spira. The gap between the powder compression screw conveyors is used as an opening for discharging chips, or the screw conveyor for conveying chips and the screw conveyor for compressing chips are both constituted by non-axial spirars. The chip discharging apparatus according to claim 3, wherein a discharging hole is provided. When the lid is fixed on the chip discharge port side of the chip conveyor for chip compression, the compression case is provided with a slot for discharging the chip, and the chip conveyor and chip compressor 4. The chip discharging apparatus according to claim 3, wherein the screw conveyors are both constituted by an axisless spira, the chip conveying screw conveyor is constituted by an axisless spira, and the chip compressing screw conveyor is constituted by an axised spiral.

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