Additional shaft mounting structure

Abstract

The present invention provides an auxiliary shaft mounting structure that facilitates easy installation of an auxiliary shaft after maintenance, offers excellent versatility, and enables the precise mounting of an auxiliary shaft. An auxiliary shaft mounting structure according to the present disclosure comprises a base element connecting a rotary shaft housing, which includes an auxiliary shaft, and an auxiliary shaft installation part of a machine tool. The base element has a first base element that is detachably mounted on the rotary shaft housing and a second base element that is detachably mounted on the auxiliary shaft installation part. The first base element and the second base element are positioned by engagement parts that mesh with each other.

Description

TECHNICAL AREA The present disclosure relates to an additional shaft mounting structure that attaches an additional shaft to a machine tool. TECHNICAL BACKGROUND A machine tool in a machining center, etc., is typically equipped with one or more auxiliary shafts. For example, the rotary axis of an auxiliary shaft is mounted on a table (an example of an auxiliary shaft carrier) of the machine tool such that the auxiliary shaft is parallel to a Z-axis of the machine tool. In this case, the auxiliary shaft is positioned so that its axial direction is perpendicular to the table of the machine tool. Accordingly, a lower end of the auxiliary shaft is positioned in the immediate vicinity of an upper surface of the table of the machine tool. Various arrangements are used to attach the auxiliary shaft to the machine tool table. One example involves an arrangement where the auxiliary shaft is fitted with a flange. In this case, the auxiliary shaft is detachably attached to the machine tool table via the flange. List of quotations Patent documents Patent document 1: Unexamined Japanese patent application, publication no. 2011-11312 REVELATION OF THE INVENTION Problems to be solved by the invention In a known case, the lower axial end of the auxiliary shaft is positioned in close proximity to the upper surface of the machine tool table. Consequently, the auxiliary shaft must be detached from the machine tool table to perform maintenance on its lower end. According to the known arrangement, detaching the auxiliary shaft from the machine tool table makes it difficult to return the shaft to its original position. For this reason, a positioning component can be incorporated to indicate the position of the auxiliary shaft relative to the machine tool table. Using this positioning component to attach one or more auxiliary shafts to the machine tool table increases the number of components and, accordingly, requires a significant amount of work for mounting the auxiliary shaft.Furthermore, the use of the position determination component may not be possible due to spatial limitations caused by the table of the machine tool. In a known case, a flat washer can be positioned between the machine tool table and the auxiliary shaft to adjust its alignment accuracy. When the auxiliary shaft is removed from the table, the washer is also removed. Therefore, when the auxiliary shaft is reattached to its original position on the machine tool table after being removed, the washer is positioned between the machine tool table and the auxiliary shaft. Repositioning the washer as described above can reduce the alignment accuracy of the auxiliary shaft. In a known case, an auxiliary shaft can be provided with a mounting flange. If an attempt is made to use a flanged auxiliary shaft with a machine tool that incorporates two auxiliary shafts, the flange of the auxiliary shaft can prevent its use with such a machine tool. Accordingly, the known auxiliary shaft mounting structure lacks versatility. To solve the problem described above, there is a need for an additional shaft mounting structure that allows for easy operation to attach an additional shaft after maintenance, high versatility, and precise attachment of the additional shaft. Means to solve the problems An auxiliary shaft mounting structure according to one aspect of the present disclosure comprises: a base member configured to couple a rotary shaft housing containing an auxiliary shaft to an auxiliary shaft carrier of a machine tool. The base member comprises: a first base member detachably attached to the rotary shaft housing; and a second base member detachably attached to the auxiliary shaft carrier. The first and second base members are positioned by engagement sections that are in engagement with each other. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic perspective view illustrating the state of use of an auxiliary shaft mounting structure according to an embodiment of the present invention; Fig. 2 is a perspective view illustrating the auxiliary shaft mounting structure according to an embodiment of the present invention when viewed from above; Fig. 3 is a perspective view illustrating the auxiliary shaft mounting structure according to an embodiment of the present invention when viewed from below; Fig. 4 is a perspective view illustrating the state of use of the auxiliary shaft mounting structure according to an embodiment of the present invention and illustrates a state in which a first base member is detached from a second base member; Fig.Figure 5 is a perspective view illustrating the state of use of the auxiliary shaft mounting structure according to the embodiment of the present invention, and illustrates a state in which a rotating shaft housing is being attached to the second base member, with a retaining member arranged between them; Figure 6 is a perspective view illustrating the state of use of the auxiliary shaft mounting structure according to the embodiment of the present invention, and illustrates a state in which the rotating shaft housing is attached to the second base member, with the retaining member arranged between them; and Figure 7 is a perspective view illustrating the state of use of the auxiliary shaft mounting structure according to the embodiment of the present invention, and illustrates a state in which the rotating shaft housing is attached to the second base member, with the retaining member arranged between them; and Figure 8 is a perspective view illustrating the state of use of the auxiliary shaft mounting structure according to the embodiment of the present invention.Figure 7 is a perspective view illustrating the state of use of the auxiliary shaft mounting structure according to the embodiment of the present invention when viewed from below, and illustrates the state in which the rotating shaft housing is attached to the second base member, with the retaining member arranged between them. PREFERRED OPERATING MODE FOR REALIZING THE INVENTION An auxiliary shaft mounting structure according to an embodiment of the present disclosure will now be described with reference to the drawings. An auxiliary shaft mounting structure 1 according to this embodiment is described with reference to Figures 1, 2 to 3. The auxiliary shaft mounting structure 1 includes a base member 6. The base member 6 couples a rotary shaft housing 3, which includes an auxiliary shaft 2, to an auxiliary shaft carrier 5 of a machine tool 4. In Figures 1, 2 to 3, the axial direction of the auxiliary shaft 2 is defined as "upward / downward direction D1" for the sake of clarity. In this case, one axial direction is defined as "upward direction D11" and the other, opposite axial direction is defined as "downward direction D12". In Figures 1, 2 to 3, the axial direction of the auxiliary shaft 2 is defined as "upward direction D11".One of two directions intersecting the up / down direction D1 is designated as "forward / backward direction D2," and the other direction is designated as "left / right direction D3." More precisely, a direction from back to front of the machine tool 4 is defined as "forward direction D21," and an opposite direction is defined as "backward direction D22." A combination of these directions is defined as "forward / backward direction D2." A combination of a left direction D31 and a right direction D32, which is opposite to the left direction D31, is defined as "left / right direction D3." In some cases, the up, down, forward, backward, right, and left directions differ from the respective directions defined for an actual machine for the sake of clarity. The rotary shaft housing 3 comprises a housing body 7 and the auxiliary shaft 2. In this embodiment, the housing body 7 has a substantially rectangular box shape in plan view. The auxiliary shaft 2 is rotatably mounted in this housing body 7. When the auxiliary shaft 2 is mounted in the housing body 7, its axial direction is parallel to the upward / downward direction D1. When the auxiliary shaft 2 is mounted in the housing body 7, it extends through the housing body 7 in the upward / downward direction D1. When the auxiliary shaft 2 is mounted in the housing body 7, it is rotatable about its own axis. The rotary shaft housing 3 configured in this way is provided for the machine tool 4 as described below, with the axial direction of the auxiliary shaft 2 aligned along the upward / downward direction D1.Accordingly, in this embodiment, the additional shaft 2 rotates around the C-axis. The machine tool 4 includes the auxiliary shaft carrier 5, on which the auxiliary shaft 2 is mounted. The machine tool 4 is not specifically limited. In this embodiment, for example, a machining fixture in a machining center is considered. In a case where the machine tool 4 is a machining fixture on a machining center, the auxiliary shaft carrier 5 is a table for the machining fixture on the machining center. The auxiliary shaft carrier 5 is in the form of a plate with plate surfaces oriented in the upward / downward direction D1. An upper plate surface of the auxiliary shaft carrier 5 has a plurality of grooves 8 that open upwards and taper downwards. The grooves 8 extend in the left / right direction D3. The grooves 8 are spaced apart from each other in the forward / backward direction D2. The base element 6 is used to mount the rotary shaft housing 3 onto the auxiliary shaft carrier 5 of the machine tool 4. The base element 6 comprises a top first base element 9 and a bottom second base element 10. In this embodiment, the first base member 9 has a substantially rectangular plate shape and plate surfaces oriented in the upward / downward direction D1. The first base member 9 has a shaft through-hole 11 through which the auxiliary shaft 2, provided in the rotating shaft housing 3, passes. The shaft through-hole 11 is located in the center of the first base member 9. Viewed from above, the shaft through-hole 11 is circular and extends through the first base member 9 in the upward / downward direction D1. The first base member 9 has base mounting holes 12 for detachably attaching the first base member 9 to the second base member 10. The base mounting holes 12 are located at four respective corners of the first base member 9. Viewed from above, the base mounting holes 12 are circular and extend through the first base member 9 in the upward / downward direction D1.Each of the base mounting holes 12, which is a stepped hole, has a large-diameter top hole 13 and a small-diameter bottom hole 14. The number of base mounting holes 12 is not limited to four. The first base member 9 is detachably attached to the rotating shaft housing 3. Therefore, in this embodiment, the first base member 9 has housing mounting holes 15 for attaching it to the rotating shaft housing 3. The housing mounting holes 15 are circular in plan view and extend through the first base member 9 in the upward / downward direction D1. In the illustrated example, two of the housing mounting holes 15 are located in a front section of the first base member 9, and the other two are located in a rear section. The number of housing mounting holes 15 is not limited to four. Each of the housing mounting holes 15, which is a stepped hole, has a small-diameter upper hole 16 and a large-diameter lower hole 17. In this embodiment, the second base member 10 has a substantially rectangular plate shape in plan view, with a larger outer surface than the first base member 9, and has plate surfaces oriented in the upward / downward direction D1. The second base member 10 has a housing section 18 that accommodates a lower end section of the auxiliary shaft 2 provided in the rotating shaft housing 3. The housing section 18 is formed in the center of the second base member 10. The housing section 18 has a bottomed recess that opens upwards and is circular in plan view. The second base member 10 has base mounting holes 19 for detachably attaching the first base member 9 to the second base member 10. The base mounting holes 19 are formed in the second base member 10 to correspond to the base mounting holes 12 of the first base member 9. Specifically, two of the base mounting holes 19 are located in a front section of the second base member 10, and the other two base mounting holes 19 are located in a rear section of the second base member 10. Each of the base mounting holes 19 is a screw hole with a thread on its inner circumferential surface. The second base member 10 is detachably attached to the auxiliary shaft carrier 5 of the machine tool 4. Therefore, in this embodiment, the second base member 10 has base mounting holes 21 for attaching it to the auxiliary shaft carrier 5. The base mounting holes 21 are formed at four respective corners of the second base member 10. Each base mounting hole 21 is circular in plan view and extends through the second base member 10 in the upward / downward direction D1. The number of base mounting holes 21 is not limited to four. The first and second base members 9 and 10 are positioned by the engagement sections 22 and 23, which engage with each other. Therefore, in this embodiment, the concave engagement sections 22 are provided on the first base member 9, and the convex engagement sections 23 are provided on the second base member 10. The engagement sections 22 of the first base member 9 are formed on a lower surface of the first base member 9 such that they are recessed upwards. In a bottom view, the engagement sections 22 of the first base member 9 are circular. The engagement sections 23 of the second base member 10 are formed on an upper surface of the second base member 10 so that they project upwards. Each of the engagement sections 23 of the second base member 10 is cylindrical. In the illustrated example, two engagement sections 22 are formed on an anterior end section of the first base phalanx 9, and two engagement sections 23 are formed on an anterior end section of the second base phalanx 10. The two engagement sections 22 are spaced apart from each other in the left / right direction D3 on the anterior end section of the first base phalanx 9. The two engagement sections 23 are spaced apart from each other in the left / right direction D3 on the anterior end section of the second base phalanx 10. To position the first and second base members 9 and 10, the lower surface of the first base member 9 must be brought into contact with the upper surface of the second base member 10, and the convex engagement sections 23 of the second base member 10 must be inserted into the concave engagement sections 22 of the first base member 9. In this configuration, the first base member 9 has the concave engagement sections 22, and the second base member 10 has the convex engagement sections 23. However, this configuration can be reversed. In other words, the first base member 9 can have convex engagement sections, and the second base member 10 can have concave engagement sections. The engagement sections 22 of the first base member 9 and the engagement sections 23 of the second base member 10 do not necessarily have to have the shape described above. One such feature of this embodiment described above makes it possible to mount the rotary shaft housing 3, which contains the auxiliary shaft 2, onto the auxiliary shaft carrier 5 of the machine tool 4, with the base member 6 positioned between them. In a state where the rotary shaft housing 3 is mounted on the auxiliary shaft carrier 5, the axial direction of the auxiliary shaft 2 is parallel to the upward / downward direction D1. Specifically, the second base member 10 is attached to the auxiliary shaft carrier 5 when bolts 24 are inserted through the associated base mounting holes 21 into the associated grooves 8 in an upper surface of the auxiliary shaft carrier 5, while a lower surface of the second base member 10 is brought into contact with the upper surface of the auxiliary shaft carrier 5. The second base member 10 can be attached at an optional position along the grooves 8 of the auxiliary shaft carrier 5. When bolts 26 are screwed through the associated housing mounting holes 15 into the corresponding screw holes (not shown) of the rotary shaft housing 3, while an upper surface of the first base member 9 is brought into contact with a lower surface of the rotary shaft housing 3, and the auxiliary shaft 2 is guided through the shaft passage hole 11, the first base member 9 is attached to the rotary shaft housing 3. With the first base member 9 attached to the rotary shaft housing 3, the lower end section of the auxiliary shaft 2 of the rotary shaft housing 3 passes through the shaft passage hole 11 of the first base member 9 and accordingly projects downwards from the first base member 9. In the illustrated example, the lower end section of the auxiliary shaft 2 is substantially circular in a bottom view. In the state where the first base member 9 is attached to the rotating shaft housing 3, the heads of the bolts 26 are each located in the large-diameter hole 17 of the corresponding housing mounting hole 15. Accordingly, the heads of the bolts 26 do not protrude downwards beyond the first base member 9. When bolts 27 are screwed through the corresponding base mounting holes 12 into the corresponding base mounting holes 19 of the second base member 10, while the lower surface of the first base member 9 is brought into contact with the upper surface of the second base member 10, and the engagement sections 23 of the second base member 10 are inserted into the corresponding engagement sections 22 of the first base member 9, the first base member 9 is attached to the second base member 10. Accordingly, the first base member 9 is detachably attached to the second base member 10. When the first base member 9 is to be attached to the second base member 10, the engagement of the engagement sections 23 of the second base member 10 with the corresponding engagement sections 22 of the first base member 9 allows the first base member 9 to be positioned relative to the second base member 10. In a state where the first base member 9 is attached to the second base member 10, the heads of the bolts 27 are each located in the large-diameter hole 13 of a corresponding base attachment hole 12. Accordingly, the heads of the bolts 27 do not protrude upwards from the first base member 9. The rotary shaft housing 3 is attached to the auxiliary shaft carrier 5 using the base member 6 as described above. Accordingly, the base member 6 can detachably couple the rotary shaft housing 3 to the auxiliary shaft carrier 5. In the state in which the rotary shaft housing 3 is mounted on the auxiliary shaft carrier 5, the lower end section of the auxiliary shaft 2 is housed in the accommodation section 18 of the second base member 10. Next, maintenance of the auxiliary shaft 2 of the rotary shaft housing 3 is described with reference to Figures 4, 5, 6 to 7. As described above, the rotary shaft housing 3 is attached to the auxiliary shaft carrier 5 using the base member 6. In this case, it can be said that the rotary shaft housing 3 is detachably attached to the second base member 10 using the first base member 9. A state in which the rotary shaft housing 3 is attached to the second base member 10 using the first base member 9 is referred to below as the "first state". To service the auxiliary shaft 2, the rotary shaft housing 3 is first detached from its initial state, as illustrated in Fig. 4. Specifically, the first base member 9 is detached from the second base member 10, which is attached to the auxiliary shaft carrier 5, while the first base member 9 remains attached to the rotary shaft housing 3. To detach the first base member 9 from the second base member 10, the bolts 27 must be unscrewed from the corresponding base mounting holes 19 of the second base member 10. This allows the first base member 9 to be separated from the second base member 10. Accordingly, the first base member 9 can be detached from the second base member 10. Lifting the first base member 9 from this position allows the rotary shaft housing 3, to which the first base member 9 is attached, to be detached from the second base member 10.Raising the first base member 9 allows the engagement between the engagement sections 22 of the first base member 9 and the engagement sections 23 of the second base member 10 to be released. In other words, raising the first base member 9 makes it possible to withdraw the engagement sections 23 of the second base member 10 from the engagement sections 22 of the first base member 9. After the first base member 9 is detached from the second base member 10, the rotary shaft housing 3 is detachably attached to the second base member 10, with a retaining member 28 arranged between them, as illustrated in Figures 5, 6 to 7. Specifically, the retaining member 28 is detachably attached to the rotary shaft housing 3 and is also detachably attached to the second base member 10, which is attached to the auxiliary shaft carrier 5. The retaining element 28 has a substantially rectangular plate shape in plan view and has plate surfaces oriented in the upward / downward direction D1. The retaining element 28 has housing mounting holes 29 for attaching the retaining element 28 to the rotary shaft housing 3. The housing mounting holes 29 are circular in plan view and extend through the retaining element 28 in the upward / downward direction D1. In the illustrated example, two of the housing mounting holes 29 are located in a front section of the retaining element 28, and the other two housing mounting holes 29 are located in a rear section of the retaining element 28. The number of housing mounting holes 29 is not limited to four. Each of the housing mounting holes 29, which is a stepped hole, has a small-diameter top hole 30 and a large-diameter bottom hole (not shown). The retaining member 28 has base mounting holes 31 for attaching the retaining member 28 to the second base member 10. The base mounting holes 31 are circular in plan view and extend through the retaining member 28 in the up / down direction D1. In the illustrated example, two base mounting holes 31 are located in the right end section of the retaining member 28. The two base mounting holes 31 are arranged at the right end section of the retaining member 28, while being spaced apart from each other in the forward / backward direction D2. The number of base mounting holes 31 is not limited to two. The retaining member 28 and the second base member 10 are positioned by engagement sections that mesh with each other. Therefore, in this embodiment, the retaining member 28 includes a concave engagement section (not shown). The engagement section of the retaining member 28 is formed in a lower surface of the retaining member 28 such that it is recessed upwards. The engagement section of the retaining member 28 is circular in a bottom view. In the illustrated example, the single engagement section is located at a front end section of the retaining member 28. In this embodiment, one of the engagement sections 23 of the second base member 10 is used as the engagement section that engages with the engagement section of the retaining member 28. The engagement sections 23 of the second base member 10 are used to position the first and second base members 9 and 10. To position the retaining member 28 and the second base member 10, the lower surface of the retaining member 28 must be brought into contact with the upper surface of the second base member 10, and a convex engagement section 23 of the second base member 10 must be inserted into the concave engagement section of the retaining member 28. As illustrated in Figures 5 and 7, the retaining element 28 is attached to the rotary shaft housing 3 when bolts 32 are screwed into the rotary shaft housing 3 through the associated housing mounting holes 29 of the retaining element 28, while one of the plate surfaces of the retaining element 28 is brought into contact with a predetermined side surface of the rotary shaft housing 3. Accordingly, the retaining element 28 is detachably attached to the rotary shaft housing 3. In a state where the retaining element 28 is attached to the rotary shaft housing 3, the heads of the bolts 32 are each located in the large-diameter hole of the associated housing mounting hole 29. Therefore, the heads of the bolts 32 do not protrude downwards from the retaining element 28. As illustrated in Figures 5 and 6, the retaining member 28 is attached to the second base member 10 when bolts 33 are screwed through the corresponding base mounting holes 31 of the retaining member 28 into the corresponding base mounting holes 19 of the second base member 10, while the other plate surface of the retaining member 28 is brought into contact with the upper surface of the second base member 10 attached to the auxiliary shaft carrier 5, and the engagement section 23 of the second base member 10 is inserted into the engagement section of the retaining member 28. Accordingly, the retaining member 28 is detachably attached to the second base member 10. In this embodiment, when the retaining member 28 is to be attached to the second base member 10, the base mounting holes 19 are used to attach the first base member 9 to the second base member 10.Accordingly, in this embodiment there is no need to form an additional screw hole for attaching the retaining member 28 to the second base member 10. The rotary shaft housing 3 is attached to the second base member 10 using the retaining member 28 in the manner described above. In a state in which the rotary shaft housing 3 is attached to the second base member 10, the axial direction of the auxiliary shaft 2 is parallel to the left / right direction D3. In this case, the axial direction of the auxiliary shaft 2 intersects with the axial direction of the auxiliary shaft 2 in the first state. A state in which the rotary shaft housing 3, to which the first base member 9 is attached, is attached to the second base member 10, which is attached to the auxiliary shaft carrier 5 such that the auxiliary shaft 2 extends along an axial direction that intersects with the axial direction of the auxiliary shaft 2 in the first state, is hereinafter referred to as the "second state". In the second state, the rotary shaft housing 3 is detachably attached to the second base member 10, which is attached to the auxiliary shaft carrier 5, with the retaining member 28 positioned between them. During the transition from the first state to the second state, the rotary shaft housing 3 is positioned in a horizontal orientation. Accordingly, in the second state, the axial direction of the auxiliary shaft 2 intersects with the axial direction of the auxiliary shaft 2 in the first state. This allows the lower end section of the auxiliary shaft 2 to be exposed, thus enabling maintenance inspections of the lower end section of the auxiliary shaft 2. After completion of a maintenance procedure, the rotary shaft housing 3 is returned to its initial state. Specifically, after the retaining element 28 has been detached from the rotary shaft housing 3 and the second base element 10, the first base element 9, to which the rotary shaft housing 3 is attached, is attached to the second base element 10. In this embodiment, a change between the initial state and the second state can occur, as described above. In this embodiment, a washer (not shown) can be used to adjust the alignment accuracy of the auxiliary shaft 2 provided in the rotary shaft housing 3. The washer is configured as a thin metal plate. The washer is provided at least either between the lower face of the rotary shaft housing 3 and the upper face of the first base member 9 or between the lower face of the second base member 10 and the upper face of the auxiliary shaft support 5. In the auxiliary shaft mounting structure 1 of this embodiment, the rotary shaft housing 3 containing the auxiliary shaft 2 is attached to the auxiliary shaft carrier 5 of the machine tool 4, with the base element 6 arranged between them. Accordingly, the first base element 9, which is attached to the rotary shaft housing 3, can be attached to and detached from the second base element 10, which is attached to the auxiliary shaft carrier 5. According to the auxiliary shaft mounting structure 1 of this embodiment, the rotary shaft housing 3 can be returned to its original position after being detached from the auxiliary shaft carrier 5. In the case of the auxiliary shaft mounting structure 1 of this embodiment, the first base member 9 is detachably attached to the rotary shaft housing 3. Accordingly, according to the auxiliary shaft mounting structure 1 of this embodiment, the first base member 9, which serves as a flange for attaching the rotary shaft housing 3 to the auxiliary shaft carrier 5, can be separated from the auxiliary shaft 2. In the case of the auxiliary shaft mounting structure 1 of this embodiment, the washer for adjusting the alignment of the auxiliary shaft 2 is provided at least either between the lower surface of the rotary shaft housing 3 and the upper surface of the first base member 9 or between the lower surface of the second base member 10 and the upper surface of the auxiliary shaft carrier 5. In the case of the auxiliary shaft mounting structure 1 of this embodiment, loosening the first base member 9 from the second base member 10 allows the auxiliary shaft 2 to be loosened from the auxiliary shaft carrier 5. Accordingly, in the case of the auxiliary shaft mounting structure 1 of this embodiment, the washer does not need to be loosened when the auxiliary shaft 2 is to be loosened from the auxiliary shaft carrier 5. In the case of the auxiliary shaft mounting structure 1 of this embodiment, a change between the first state and the second state is possible. Accordingly, according to the auxiliary shaft mounting structure 1 of this embodiment, the lower end section of the auxiliary shaft 2 can be easily serviced, and the auxiliary shaft 2 can be easily returned to its original position after service. In the case of the auxiliary shaft mounting structure 1 of this embodiment, in the second state the rotary shaft housing 3 is detachably attached to the second base member 10, which is attached to the auxiliary shaft support 5, with the retaining member 28 arranged between them. Accordingly, according to the auxiliary shaft mounting structure 1 of this embodiment, the rotary shaft housing 3, which is positioned in a horizontal orientation, can be easily attached to the second base member 10. According to the embodiment described above, the rotary shaft housing 3 containing the auxiliary shaft 2 is detachably attached to the auxiliary shaft carrier 5 of the machine tool 4 using the base member 6. Accordingly, it is possible to provide the auxiliary shaft mounting structure 1, which is superior due to: ease of use for attaching the auxiliary shaft 2 after maintenance; versatility; and accuracy in attaching the auxiliary shaft 2. Although the present disclosure has been described in detail, it is not limited to the embodiments described above. Various additions, substitutions, modifications, deletions, and the like may be made to the embodiment without deviating from the core content of the disclosure or from the idea and meaning of the present disclosure as derived from the content described in the claims and equivalents thereof. Although the preceding embodiment illustrates the sequence of operations and the sequence of processes as examples, the sequences are not limited to those described above. The same applies if the description of the preceding embodiments includes numerical values ​​or formulas. For example, in the preceding embodiment, the first base member 9 is attached to the second base member 10 by the bolts 27, but can be detachably attached to the second base member 10 by means other than the bolts 27. In the preceding embodiment, the first and second base members 9 and 10 are essentially rectangular in plan view. However, the shapes of these members are not limited to this form. The following additional remarks regarding the embodiment are further disclosed. (Additional Note 1) An auxiliary shaft mounting structure (1) comprises: a base member (6) configured to couple a rotary shaft housing (3) containing an auxiliary shaft (2) to an auxiliary shaft carrier (5) of a machine tool (4). The base member (6) comprises: a first base member (9) detachably attached to the rotary shaft housing (3); and a second base member (10) detachably attached to the auxiliary shaft carrier (5). The first and second base members (9) and (10) are positioned by engagement sections (22, 23) that are in engagement with each other. (Additional Note 2) In the auxiliary shaft mounting structure (1) of supplementary note 1, a change between a first state and a second state can preferably occur. The first state is when the rotating shaft housing (3) is mounted on the second base member (10) using the first base member (9). The second state is when the rotating shaft housing (3), to which the first base member (9) is mounted, is mounted on the second base member (10) such that the auxiliary shaft (2) is parallel to an axial direction that intersects with an axial direction of the auxiliary shaft (2) in the first state. (Additional Note 3) In the additional shaft mounting structure (1) of additional note 2, the rotary shaft housing (3) can preferably be attached to the second base member (10) via an intermediate retaining member (28) in the second state. Reference symbol list 1 Auxiliary shaft mounting structure 2 Auxiliary shaft 3 Rotary shaft housing 4 Machine tool 5 Auxiliary shaft carrier 6 Base element 9 First base element 10 Second base element 22 Engagement section 23 Engagement section 28 Retaining element QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature JP 2011-11312

[0004]

Claims

Auxiliary shaft mounting structure comprising: a base member configured to couple a rotary shaft housing containing an auxiliary shaft to an auxiliary shaft carrier of a machine tool, wherein the base member comprises: a first base member detachably attached to the rotary shaft housing; and a second base member detachably attached to the auxiliary shaft carrier, wherein the first and second base members are positioned by engagement sections that are in engagement with each other. Auxiliary shaft mounting structure according to claim 1, wherein a first state and a second state are provided, which are selectable in between: wherein the first state is when the rotating shaft housing is attached to the second base member using the first base member; and wherein the second state is when the rotating shaft housing, to which the first base member is attached, is attached to the second base member such that the auxiliary shaft is parallel to an axial direction that intersects an axial direction of the auxiliary shaft in the first state. Additional shaft mounting structure according to claim 2, wherein the rotary shaft housing is mounted on the second base member via an intermediate retaining member in the second state.

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