JP4973852B2 - Work conveying method and apparatus, and work machining apparatus - Google Patents

Description

  The present invention relates to a workpiece transfer method and apparatus suitable for transferring workpieces in various processing machines and the like, and a workpiece processing apparatus using the apparatus.

  In the manufacturing method of a ferrite magnet, ferrite powder is formed and fired. A sintered ferrite body (hereinafter referred to as “work”) obtained by firing has a non-uniform shape due to firing strain as shown in FIG. For this reason, it is general that the workpiece is polished or ground with, for example, a rotating grindstone so as to approach the target shape. In processing with a rotating grindstone, for example, the workpiece height is first adjusted as shown in FIG. 7B by rough grinding, and then the shape of the workpiece is kept within specifications as shown in FIG.

In order to feed multiple workpieces to the processing position with a rotating grindstone, the workpieces have been conventionally clamped or bonded for tact processing, and through feed processing using nip rolls has also been performed from the viewpoint of high-speed processing. It has been broken. The following Patent Documents 1 to 3 are known documents related to workpiece conveyance.
JP 11-347900 A Japanese Utility Model Publication No. 64-16252 JP-A-11-267957

  Patent Document 1 relates to a machining apparatus and a machining method for a magnet member that grinds various magnet members into a desired shape, and conveys the magnetic member toward a machining position by a rotating grindstone while pressing the roller with a roller (paragraph [0042]).

  Patent Document 2 discloses that when the outer surface and the inner surface of a ferrite magnet for a motor are ground with a grinding machine equipped with a diamond grindstone, the ferrite magnets are arranged in a row and sandwiched by rubber rollers from above and below and sent to a rotating grindstone. (The second page of the specification). This technique corresponds to the through feed processing using the nip roll described above. This will be described below.

  FIG. 8 is a conceptual configuration diagram of a general through-feed machining apparatus using nip rolls. Each of the squares arranged in one row is a row of the workpieces 1 that are, for example, ferrite magnets. This apparatus employs a mechanism that conveys a row of workpieces 1 to a polishing / grinding machine having a rotating grindstone 10 using a rubber roller 11 as a nip roll. In this mechanism, the workpiece 1 supplied on the conveyance entrance side is sandwiched by rubber rollers 11 as nip rolls and sequentially sent to the conveyance downstream side, so that the workpiece fed first is pushed into the processing position by the rotating grindstone 10 from behind. I try to send it in.

  Patent Document 3 relates to an improvement of a grinding apparatus used for grinding an object to be ground such as a ferrite core, and the work is sandwiched between opposed belt strips and transferred to a machining position by a rotating grindstone (paragraph [0017]). ).

  Since the processing machine that performs polishing and grinding as described above has a large load on the workpiece, it is difficult to convey the workpiece by a general conveyor (such as a belt conveyor or a roller conveyor) when continuously feeding the workpiece for the purpose of increasing the production capacity. However, considering the production capacity, it is desirable to continuously input the workpiece. In the through feed processing using the nip roll described above, the workpiece is transferred while being sandwiched between a pair of rubber rollers, and therefore, the workpiece can be easily conveyed with a thrust superior to the processing load as compared with conveyance by a conveyor. However, for example, when the processing load is larger due to a large amount of workpiece grinding or the like, if there is only one nip roll, the thrust may be insufficient. As a countermeasure, it is conceivable to provide two or more nip rolls to compensate for the lack of thrust. This will be discussed below.

  FIG. 9A and FIG. 9B show a case where two nip rolls are provided in a configuration in which polishing and grinding are performed as shown in FIG. 9A, the peripheral speed V1 due to the rotation of the transport upstream nip roll 12 is slower than the peripheral speed V2 due to the rotation of the transport downstream nip roll 13, and conversely in FIG. 9B, the peripheral speed V1 of the transport upstream nip roll 12 is. Is faster than the peripheral speed V2 of the conveyance downstream side nip roll 13. Here, “peripheral speed” is used to mean the moving speed of the outer peripheral portion, that is, the moving distance per unit time of the outer peripheral portion. In the case of the configuration shown in these figures, the sum of the workpiece conveyance force F1 by the conveyance upstream nip roll 12 and the workpiece conveyance force F2 by the conveyance downstream nip roll 13 is the workpiece thrust F3, and the workpiece is conveyed unless this is defeated by the processing load. it can. Therefore, it can be said that increasing the number of nip rolls installed is effective from the viewpoint of increasing the thrust F3 of the workpiece as described above, but needs to be examined from another viewpoint.

  For example, when roughing a workpiece, as described above, since the rough grinding is grinding for aligning the height of a workpiece having a non-uniform shape as shown in FIG. 7A, the grinding depth, that is, the processing load varies greatly from workpiece to workpiece. And may vary from lot to lot. Therefore, for some workpieces, the thrust from two nip rolls is sufficient, but for other workpieces, the thrust from one nip roll may be sufficient. It is mainly the latter case that needs to be considered. This will be specifically described below.

  9A, when the peripheral speed V1 of the transport upstream nip roll 12 is slower than the peripheral speed V2 of the transport downstream nip roll 13, the transport downstream nip roll is faster than the peripheral speed V1 of the transport upstream nip roll 12. When the machining load is such that 13 can send out the workpiece independently, a conveyance gap is generated in the workpiece row before and after passing through the conveyance downstream nip roll 13. When the conveyance gap is generated in the workpiece row, the workpiece intermittently advances downstream of the conveyance downstream nip roll 13. That is, the workpiece is temporarily stopped at the machining position. For this reason, there is a possibility that a processing defect of the workpiece may occur.

  In order to avoid this without fail, it is necessary to set the peripheral speed V1 of the transport upstream nip roll 12 to be equal to or higher than the peripheral speed V2 of the transport downstream nip roll 13 as shown in FIG. 9B. = V2 is difficult to keep, so set V1> V2. However, in this case, when the processing upstream load nip roll 12 is capable of feeding the workpiece independently at a speed higher than the peripheral speed V2 of the conveyance downstream nip roll 13, the conveyance downstream nip roll 13 advances in the workpiece conveyance direction. Since it acts so as to prevent it, the moving speed V3 of the workpiece is suppressed to the peripheral speed V2 of the conveyance downstream nip roll 13. Accordingly, the processing ability is deteriorated as compared with the case where the workpiece is conveyed by the conveyance upstream side nip roll 12 alone.

  The present invention has been made through such considerations, and the object thereof is a workpiece transfer method and apparatus that can suppress the deterioration of the processing capacity at light load while allowing the workpiece to be transferred with sufficient thrust. Another object of the present invention is to provide a workpiece machining apparatus using the apparatus.

One embodiment of the present invention relates to a work transfer method. This method
A conveyance path that guides the workpiece in the conveyance direction, a first drive unit that rotationally drives the first feed roller pair and the first feed roller pair, and a second drive unit that rotationally drives the second feed roller pair and the second feed roller pair. Two drive units,
A first feeding step of rotating and driving the first feed roller pair so as to sandwich the work fed from the transport entry side and feed it in the transport direction by the first feed roller pair;
A second feeding step of rotating and driving the second feed roller pair to sandwich the work fed from the first feed roller pair by the second feed roller pair and feeding it in the transport direction;
In the second feeding step, the workpiece reaches a processing position by a rotating grindstone, and the rotating grindstone rotates in a direction opposite to the first and second feed roller pairs,
When the peripheral speed of the first feed roller pair is V1, and the peripheral speed of the second feed roller pair is V2, the relationship of V1 ≧ V2 holds.
The second drive unit transmits torque to the second feed roller pair via a one-way clutch, and the one-way clutch rotates the driving side of the one-way clutch with respect to the driven side in a direction to feed the workpiece in the conveying direction. mesh in the direction of, and idle in the opposite direction, the second delivery step work conveying speed V3 after is characterized in that it does not exceed the work conveying speed V1 of the first delivery step.

In this method , each of the first and second drive units may use a motor with adjustable speed as a rotational drive source.

Another aspect of this invention is related with a workpiece conveyance apparatus. This device
A conveyance path for guiding the workpiece in the conveyance direction;
A first feed roller pair that sandwiches the work fed from the transport entry side and feeds it in the transport direction;
A first drive unit that rotationally drives the first feed roller pair;
A second feed roller pair that sandwiches the work fed from the first feed roller pair and feeds it in the transport direction;
A second drive unit that rotationally drives the second feed roller pair;
The work fed out from the second feed roller pair reaches the processing position by the rotating grindstone,
The rotating grindstone rotates in the opposite direction to the first and second feed roller pairs,
When the peripheral speed of the first feed roller pair is V1, and the peripheral speed of the second feed roller pair is V2, the relationship of V1 ≧ V2 holds.
The second drive unit transmits torque to the second feed roller pair via a one-way clutch, and the one-way clutch rotates the driving side of the one-way clutch with respect to the driven side in a direction to feed the workpiece in the conveying direction. It is characterized by meshing in the direction of rotation and idling in the opposite direction .

In this apparatus , each of the first and second drive units may use a motor with adjustable speed as a rotational drive source.

  The peripheral speed of the second feed roller pair may be set so as not to exceed the peripheral speed of the first feed roller pair.

  Still another aspect of the present invention relates to a workpiece machining apparatus, the workpiece conveyance device described above, a rotating grindstone for polishing or grinding the workpiece fed from the second feed roller pair on a conveyance path, and a spindle to which the rotating grindstone is attached. And a grindstone driving unit that rotationally drives the spindle.

  It should be noted that any combination of the above-described constituent elements, or a conversion of the expression of the present invention between systems or the like is also effective as an aspect of the present invention.

  According to the present invention, it is possible to convey a workpiece with sufficient thrust by using two pairs of feed rollers, while transmitting torque to the second feed roller pair on the downstream side of conveyance by using a one-way clutch. Deterioration of processing capability can be suppressed.

  The embodiment will be described by taking as an example a workpiece processing apparatus that performs roughing to polish or grind a workpiece that is non-uniform in shape due to firing strain to make the height uniform. Hereinafter, polishing or grinding is referred to as “grinding”.

  FIG. 1 is a principle configuration diagram of a workpiece machining apparatus 70 according to an embodiment. The workpiece machining apparatus 70 includes a workpiece conveyance unit 50 and a workpiece machining unit 18. The workpiece conveyance unit 50 is an example of the workpiece conveyance device of the present invention, and conveys the workpiece against the machining load imposed by the workpiece machining unit 18.

  The work transport unit 50 includes a work transport path 20, a transport upstream nip roll 12, an upstream drive motor 22, a transport downstream nip roll 13, a downstream drive motor 23, and a one-way clutch 27. The transport upstream nip roll 12 and the transport downstream nip roll 13 are examples of a first feed roller pair and a second feed roller pair, respectively. The upstream drive motor 22 and the downstream drive motor 23 are examples of a first drive unit and a second drive unit, respectively. The workpiece processing unit 18 includes a first rotating grindstone 14A and a second rotating grindstone 14B.

  The workpiece conveyance path 20 slidably supports the workpiece 1 such as a ferrite sintered body shown in FIG. 7 and guides it in the conveyance direction. The conveyance direction is a direction from left to right in FIG. The workpiece 1 is fed onto the workpiece conveyance path 20 by the conveyor 2. Alternatively, the workpiece 1 may be manually supplied onto the workpiece conveyance path 20.

  The conveyance upstream nip roll 12 is composed of a pair of rubber rollers, and is rotated by an upstream drive motor 22 so that the workpiece 1 fed onto the workpiece conveyance path 20 by the conveyor 2 is sandwiched from above and below and sent out in the conveyance direction ( First delivery step). As a result, the workpiece 1 sent out first is pushed from behind and advances in the carrying direction, and reaches the position of the carrying downstream nip roll 13 by so-called pushing. That is, the plurality of workpieces 1 proceed in the transport direction in a row without gaps. It should be noted that the upstream drive motor 22 may be provided separately for one and the other of the pair of rubber rollers constituting the transport upstream nip roll 12 or only one in common. The same applies to a downstream drive motor 23 described later. These motors 22 and 23 are capable of adjusting the speed by an inverter shift at an output of 90 W, for example.

  The conveyance downstream nip roll 13 is also composed of a pair of rubber rollers, and is rotated by a downstream drive motor 23 via a one-way clutch 27, whereby the workpiece 1 fed from the conveyance upstream nip roll 12 is sandwiched from above and below in the conveyance direction. (Second delivery step). Thereby, the workpiece | work 1 sent out previously is pushed from back, advances in a conveyance direction, and reaches | attains the processing position by 14 A of 1st rotary grindstones by pressing. That is, the plurality of workpieces 1 proceed in the transport direction in a row without gaps.

  The first rotating grindstone 14 </ b> A is driven to rotate by a grindstone driving motor (not shown) to grind the work 1 sent out from the conveyance downstream nip roll 13. The workpiece 1 ground here advances in the conveying direction by pressing and reaches the processing position by the second rotating grindstone 14B. The second rotating grindstone 14B is further driven by a grindstone driving motor (not shown) to further grind the workpiece 1 ground by the first rotating grindstone 14A. The workpiece 1 ground here is discharged from the discharge chute 30. Each grindstone drive motor uses, for example, an output of 7.5 kW and 3000 rpm.

  As shown in FIG. 7, in the rough grinding in which the height of the workpiece 1 having a non-uniform shape is made uniform, the grinding amount varies by about 0.3 mm to 0.6 mm depending on the workpiece. Therefore, the first rotating grindstone 14A and the second rotating grindstone 14B each have a grinding ability of 0.5 mm, and the work processing apparatus 70 as a whole has a grinding ability of 1 mm. Further, the grinding width of the workpiece is, for example, 30 mm. Moreover, the conveyance speed of the workpiece | work 1 shall be 160 mm / min, for example.

  The workpiece machining apparatus 70 according to the present embodiment is provided with two nip rolls for conveying the workpiece 1 to the workpiece machining unit 18. For this reason, as long as the resultant force of the workpiece conveyance force F1 by the conveyance upstream nip roll 12 and the workpiece conveyance force F2 by the conveyance downstream nip roll 13, that is, the thrust F3, is not defeated by the machining load, the workpiece 1 can be sent to the workpiece machining unit 18. That is, the allowable maximum value of the processing load is larger than when only one nip roll is provided. If the allowable maximum value of the processing load increases, the amount of grinding per operation can be increased, so that the work processing step can be reduced and efficiency is improved.

  Further, in the workpiece machining apparatus 70 according to the present embodiment, the rotational speed per unit time of the upstream drive motor 22 and the downstream drive motor 23 is set so that the peripheral speed V2 of the transport downstream nip roll 13 is equal to the peripheral speed of the transport upstream nip roll 12. It is necessary not to be faster than the speed V1 (that is, V1 ≧ V2). In practice, it is difficult to always keep V1 = V2, so V1> V2. As a result, the risk of occurrence of processing defects on the workpiece due to the above-described conveyance gap is reduced.

  Further, the workpiece machining apparatus 70 according to the present embodiment uses a one-way clutch 27 to transmit torque from the downstream drive motor 23 to the conveyance downstream nip roll 13. The one-way clutch 27 meshes in a direction in which the driving side of the one-way clutch 27 rotates with respect to the driven side in the direction in which the workpiece 1 is sent in the conveying direction, and idles in the opposite direction. That is, when the direction in which the workpiece is fed in the transport direction is the forward direction, the one-way clutch 27 is engaged to transmit the forward torque when the driving side of the one-way clutch 27 tries to rotate in the forward direction with respect to the driven side. On the other hand, when the forward rotation angular velocity on the driven side of the one-way clutch 27 is larger than the forward rotation angular velocity on the driving side, the idle rotation occurs. Accordingly, the transport downstream nip roll 13 suppresses the workpiece moving speed V3 when the processing upstream load nip roll 12 can feed the workpiece independently at a speed higher than the peripheral speed V2 of the transport downstream nip roll 13. It is prevented from acting on. Therefore, the upper limit of the processing capacity, that is, the workpiece moving speed V3 is increased to the peripheral speed V1 of the transport upstream nip roll 12 without being suppressed by the peripheral speed V2 of the transport downstream nip roll 13.

  FIG. 2A shows the transition of the processing capacity when the processing load varies in the workpiece processing apparatus 70 shown in FIG. In the figure, the solid line indicates the processing capacity (processing speed), and the two-dot chain line indicates the processing load. The processing capacity is indicated by a workpiece moving speed V3 for convenience. As shown in the figure, in the workpiece machining apparatus 70 of the present embodiment, the machining capacity, that is, the workpiece moving speed V3 exceeds the peripheral speed V2 of the conveyance downstream nip roll 13 at the time of light load, and the conveyance upstream nip roll 12 at maximum. The peripheral speed V1 is increased. FIG. 2B shows a case where a one-way clutch is not provided as a comparative example.

  FIG. 2B shows the transition of the processing capacity (processing speed) when the processing load varies in the workpiece processing apparatus shown in FIG. 9B. In the figure, the solid line indicates the processing capability, and the two-dot chain line indicates the processing load. The processing capacity is indicated by a workpiece moving speed V3 for convenience. As shown in this figure, in the workpiece machining apparatus shown in FIG. 9B without a one-way clutch, the machining processing capacity, that is, the upper limit of the workpiece moving speed V3 is the circumference of the conveyance downstream nip roll 13 even at a light load. The speed is suppressed to V2.

  As described above, according to the present embodiment, it is possible to keep the processing capacity at a light load high while increasing the allowable maximum value of the processing load. Be expected.

  Hereinafter, a specific configuration of the workpiece machining apparatus 70 according to the present embodiment will be described with reference to FIGS. 3 to 6. 3 is a front view of a specific configuration of the workpiece machining apparatus 70 shown in FIG. 1, FIG. 4 is a left sectional view thereof, and FIG. 5 is a right sectional view thereof. 6 is a left sectional view of the conveyance downstream nip roll 13 shown in FIG. 3 and the vicinity thereof.

  As shown in FIG. 4, the vertical slide guide 117 is fixedly supported on the fixed frame 105 fixed on the base 101. Two shaft support members 119 are supported by the vertical slide guide 117 so as to be movable up and down. The vertical position of the shaft support member 119 can be adjusted by a vertical position adjustment mechanism (not shown). The shaft support member 119 rotatably supports the drive shaft 115 of the transport upstream nip roll 12. Accordingly, the vertical position of the transport upstream nip roll 12 can be adjusted by a vertical position adjustment mechanism (not shown) (FIG. 4 shows a state where the nip rolls 12 are separated from each other). Similarly, the conveyance downstream nip roll 13 shown in FIG. 3 can be adjusted in the vertical position. The upstream drive motor 22 is connected to the drive shaft 115 of the transport upstream nip roll 12 via the speed reduction mechanism 113 and rotationally drives it. The conveyance upstream nip roll 12 is fixed so as to rotate integrally with the drive shaft 115. The conveyance downstream nip roll 13 is attached to a drive shaft that is rotationally driven by the downstream drive motor 23 in FIG. 1 via a one-way clutch 27 in FIG.

  As shown in FIG. 5, a transport rail 107 corresponding to the work transport path 20 is fixedly supported on the rail support member 103 fixed on the base 101. The conveyance rail 107 supports the workpiece 1 in a slidable manner and guides it in the conveyance direction.

  A vertical slide guide 141 is fixedly supported on the fixed frame 105. A spindle support portion 143 is supported on the vertical slide guide 141 so as to be movable up and down. The vertical position of the spindle support portion 143 can be adjusted by a vertical position adjustment mechanism (not shown). The spindle support portion 143 rotatably supports the spindle 147 to which the second rotating grindstone 14B is attached. Therefore, the vertical position of the second rotating grindstone 14B can be adjusted by the vertical position adjustment mechanism (not shown). Similarly, the vertical position of the first rotating grindstone 14A shown in FIG. 3 can be adjusted. The grindstone drive motor (not shown) is connected to the spindle 147 via a transmission mechanism including a belt wheel 155 and a V-belt (not shown), and rotationally drives it. The second rotating grindstone 14B is fixed so as to rotate integrally with the spindle 147. The first rotating grindstone 14A is also rotationally driven by a similar mechanism.

  As shown in FIG. 6, the upper feed roller of the transport downstream nip roll 13 includes a rubber outer peripheral body 131 and clampers 133 and 134, and is connected to the drive shaft 123 via the one-way clutch 27. The one-way clutch 27 includes an inner peripheral member 127 on the driving side and an outer peripheral member 129 on the driven side. The inner peripheral member 127 is attached to the drive shaft 123 so as to rotate integrally with the drive shaft 123 and move in the axial direction of the drive shaft 123 (for example, key or spline coupling), and the outer peripheral member 129 is a clamper 133 of the transport downstream nip roll 13. And fixed. The rubber outer peripheral body 131 is fixed by being sandwiched between clampers 133 and 134. Although omitted in the drawing, the downstream drive motor 23 is also connected to the drive shaft 123 of the transport downstream nip roll 13 through the speed reduction mechanism, similarly to the upstream drive motor 22.

  The one-way clutch 27 meshes in the direction in which the drive shaft 123 rotates with respect to the conveyance downstream nip roll 13 in the direction in which the workpiece 1 is sent in the conveyance direction, and idles in the opposite direction.

  The position of the conveyance downstream side nip roll 13 in the direction of the drive shaft 123 can be adjusted by an axial position adjustment mechanism 138. The axial position adjustment mechanism 138 includes a boss 135, a fixing plate 136, and a thrust position adjustment screw 125. The boss 135 is fixed to the clamper 133 and is rotatably supported by the radial shaft 139 with respect to the drive shaft 123. The fixing plate 136 is fixed to the boss 135. The thrust position adjusting screw 125 passes through the central hole of the fixing plate 136 and is screwed into a screw hole provided on the end surface of the drive shaft 123. The small diameter portion of the thrust position adjusting screw 125 is engaged with the periphery of the central hole of the fixing plate 136. When the thrust position adjusting screw 125 is tightened, the fixing plate 136 and the boss 135 move to the left in FIG. As a result, the transport downstream nip roll 13 also moves in the same direction. When the thrust position adjusting screw 125 is loosened, it moves in the reverse direction. Since the lower feed roller of the conveyance downstream side nip roll 13 is the same as the upper feed roller, the description thereof is omitted.

  Those skilled in the art will understand that the above-described embodiment is an exemplification, and that various modifications can be made to the combination of each component and each treatment process, and such modifications are within the scope of the present invention. .

  In the embodiment, the number of nip rolls for conveying the workpiece 1 to the workpiece processing unit 18 is two, but the present invention is not limited to this, and the number of nip rolls may be three or more. According to this, the allowable maximum value of the machining load is further increased. In this case, the peripheral speed of the nip roll located on the most downstream side is set so as not to exceed the peripheral speed of the nip roll located on the upstream side, and the driving force is transmitted to the nip roll located on the most downstream side via a one-way clutch. To do. As a result, as in the embodiment, it is possible to reduce the risk of occurrence of machining defects on the workpiece and to keep the machining performance at a light load high.

  Further, in the embodiment, the nip roll sandwiches the workpiece from the top and bottom and sends it out in the conveyance direction, but may sandwich the workpiece from the left and right. The direction in which the workpiece is sandwiched is arbitrary. Moreover, although the rubber roller was illustrated as a nip roll, the elastic material roller with a large friction coefficient may be sufficient.

  In the embodiment, the first rotating grindstone 14A and the second rotating grindstone 14B are both used for rough polishing. However, if the shape accuracy of the work in the previous process, that is, ferrite powder forming and firing, is improved, the second rotating grindstone 14B is It can also be used for precision research.

  In the embodiment, the number of the rotating grindstones for grinding the workpiece 1 is two. However, the present invention is not limited to this, and the number of the rotating grindstones may be one or three or more. The number of rotating grindstones can be determined as appropriate according to the grinding ability of the grindstone and the required amount of grinding.

  Moreover, although the example which grinds the upper surface of a workpiece | work was demonstrated in embodiment, it is naturally possible to apply when grinding a lower surface and a side surface.

  Moreover, although ferrite sintered compact was made into the example of the workpiece | work in embodiment, it is not limited to this, A workpiece | work can be widely called a to-be-processed article.

It is a fundamental lineblock diagram of a work processing device concerning an embodiment of the invention. FIG. 5A shows a change in processing capacity when the processing load varies in the workpiece processing apparatus, and FIG. 5A is a graph in the case of the workpiece processing apparatus (with one-way clutch) of the embodiment shown in FIG. These are the graphs in the case of the workpiece | work processing apparatus (without a one-way clutch) shown by FIG. 9 (B). It is a front view of the specific structure of the workpiece processing apparatus shown by FIG. FIG. FIG. FIG. 4 is a left sectional view of the conveyance downstream nip roll shown in FIG. 3 and the vicinity thereof. (A) is an explanatory diagram of the shape of a workpiece that is non-uniform due to firing strain, (B) is an explanatory diagram of the shape of the workpiece after rough polishing, (C) It is explanatory drawing of the shape of the workpiece | work after careful research. It is a notional block diagram of the general through-feed processing apparatus using a nip roll. FIG. 5A is an explanatory diagram showing an example of through-feed conveyance in which two nip rolls are provided, and FIG. 5B is an explanatory diagram showing another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work 2 Conveyor 12 Conveyance upstream nip roll 13 Conveyance downstream nip roll 14A 1st rotation grindstone 14B 2nd rotation grindstone 18 Work processing part 20 Work conveyance path 22 Upstream drive motor 23 Downstream drive motor 27 One-way clutch 30 Discharge chute 50 Workpiece Conveying section 70 Work processing device V1 Conveying upstream nip roll peripheral speed V2 Conveying downstream nip roll peripheral speed V3 Conveying speed F1 Conveying upstream nip roll work conveying force F2 Conveying downstream nip roll work conveying force F3 Thrust

Claims (6)

A conveyance path that guides the workpiece in the conveyance direction, a first drive unit that rotationally drives the first feed roller pair and the first feed roller pair, and a second drive unit that rotationally drives the second feed roller pair and the second feed roller pair. Two drive units,
A first feeding step of rotating and driving the first feed roller pair so as to sandwich the work fed from the transport entry side and feed it in the transport direction by the first feed roller pair;
A second feeding step of rotating and driving the second feed roller pair to sandwich the work fed from the first feed roller pair by the second feed roller pair and feeding it in the transport direction;
In the second feeding step, the workpiece reaches a processing position by a rotating grindstone, and the rotating grindstone rotates in a direction opposite to the first and second feed roller pairs,
When the peripheral speed of the first feed roller pair is V1, and the peripheral speed of the second feed roller pair is V2, the relationship of V1 ≧ V2 holds.
The second drive unit transmits torque to the second feed roller pair via a one-way clutch, and the one-way clutch rotates the driving side of the one-way clutch with respect to the driven side in a direction to feed the workpiece in the conveying direction. The workpiece conveyance method is characterized in that the workpiece conveyance speed V3 after the second delivery step does not exceed the workpiece conveyance speed V1 of the first delivery step. The method according to claim 1 , wherein each of the first and second drive units uses a speed-adjustable motor as a rotation drive source. A conveyance path for guiding the workpiece in the conveyance direction;
A first feed roller pair that sandwiches the work fed from the transport entry side and feeds it in the transport direction;
A first drive unit that rotationally drives the first feed roller pair;
A second feed roller pair that sandwiches the work fed from the first feed roller pair and feeds it in the transport direction;
A second drive unit that rotationally drives the second feed roller pair;
The work fed out from the second feed roller pair reaches the processing position by the rotating grindstone,
The rotating grindstone rotates in the opposite direction to the first and second feed roller pairs,
When the peripheral speed of the first feed roller pair is V1, and the peripheral speed of the second feed roller pair is V2, the relationship of V1 ≧ V2 holds.
The second drive unit transmits torque to the second feed roller pair via a one-way clutch, and the one-way clutch rotates the driving side of the one-way clutch with respect to the driven side in a direction to feed the workpiece in the conveying direction. A workpiece transfer device that engages in a direction to rotate and idles in the opposite direction . The apparatus according to claim 3 , wherein each of the first and second drive units uses a speed-adjustable motor as a rotation drive source. The apparatus according to claim 3 or 4 , wherein the peripheral speed of the second feed roller pair does not exceed the peripheral speed of the first feed roller pair. A workpiece transfer device according to any of claims 3 to 5, and the grinding wheel and workpiece fed from the second feed roller pair is polished or ground in the transport path, and the spindle in which the grinding wheel is mounted , workpiece machining apparatus characterized by comprising: a grindstone driving unit for rotationally driving the spindle.

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