CN108177204B - Clamping device for woodworking tool execution part - Google Patents
Clamping device for woodworking tool execution part Download PDFInfo
- Publication number
- CN108177204B CN108177204B CN201810229771.6A CN201810229771A CN108177204B CN 108177204 B CN108177204 B CN 108177204B CN 201810229771 A CN201810229771 A CN 201810229771A CN 108177204 B CN108177204 B CN 108177204B
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- sliding block
- groove
- bracket
- clamping
- vertical
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27C—PLANING, DRILLING, MILLING, TURNING OR UNIVERSAL MACHINES FOR WOOD OR SIMILAR MATERIAL
- B27C5/00—Machines designed for producing special profiles or shaped work, e.g. by rotary cutters; Equipment therefor
- B27C5/02—Machines with table
- B27C5/06—Arrangements for clamping or feeding work
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Joining Of Building Structures In Genera (AREA)
Abstract
The invention discloses a clamping device of a woodworking tool execution part, which is used for connecting the execution part to a bracket of the woodworking tool, wherein a bracket groove for connecting the clamping device is formed in the bracket; the bracket groove comprises a transverse groove and a vertical groove which are communicated with each other and transversely penetrate through the width direction of the bracket, the transverse groove is positioned at the lower part of the vertical groove, and the transverse groove is provided with a clamping part protruding out of the vertical groove in the length direction of the bracket; the clamping device comprises a sliding block sliding in the transverse groove and a locking block used for locking or loosening the sliding block and sliding along the groove wall of the vertical groove, the locking block is propped against a sliding block propping column on the bottom surface of the transverse groove, a propping spring for providing propping force for the sliding block propping column is used for vertically and sequentially connecting the sliding block propping column, the locking block, the sliding block and a sliding block support of an executing component. The invention can firmly fix the execution part on the support of the woodworking tool and can conveniently adjust the position of the execution part.
Description
Technical Field
The invention relates to the field of wood board processing tools, in particular to a clamping device for a woodworking tool execution part.
Background
Modern house decoration is a complex engineering of a system, and needs to be manufactured and installed on various wooden house decoration articles such as suspended ceilings, shoe cabinets, clothes cabinets, storage cabinets, tatami and the like, a large number of finished wood boards are needed, and the wood boards are usually required to be cut and processed to adapt to specific sizes and patterns of different houses, the cutting and processing often needs to be performed by scribing in advance when the wood boards, the size is determined in advance, the cut size is convenient to be accurate, and holes are often needed to be formed in the wood boards, so that the installation positions of lamps are reserved in suspended ceilings, or the interface installation positions of televisions are reserved in background walls, or the installation positions of sockets are reserved. At this time, various proper woodworking tools are used, and various actuating components are provided for cutting, pre-scribing lines and pre-drawing circles. In the prior art, the connection between the execution part and the woodworking tool is often simple and rough, cannot be adjusted and is easy to loosen.
Disclosure of Invention
The invention aims to provide a clamping device for an execution part of a woodworking tool, which can overcome the defects of the prior art, firmly fix the execution part on a bracket of the woodworking tool and conveniently adjust the position of the execution part.
The technical aim of the invention is realized by the following technical scheme:
the clamping device is used for connecting the execution component to a support of a woodworking tool, and a support groove used for connecting the clamping device is formed in the support; the bracket groove comprises a transverse groove and a vertical groove which are communicated with each other and transversely penetrate through the width direction of the bracket, the transverse groove is positioned at the lower part of the vertical groove, and the transverse groove is provided with a clamping part protruding out of the vertical groove in the length direction of the bracket; the clamping device comprises a sliding block sliding in the transverse groove and a locking block used for locking or releasing the sliding block and sliding along the groove wall of the vertical groove, the sliding block is propped against a sliding block propping column on the bottom surface of the transverse groove, a propping spring for providing propping force for the sliding block propping column is used for vertically and sequentially connecting the sliding block propping column, the locking block, the sliding block and the sliding block support of the executing component.
The slider is installed in the transverse groove in the support groove, after the clamping portion is clamped into the slider, the locking block is cut into between the slider and the transverse groove wall from top to bottom, the movement of the slider in the length direction of the support is limited, the slider support, the locking block and the slider are connected in series by the slider support column, the slider is always supported on the bottom surface of the transverse groove, the supporting spring provides a downward force, the locking block is always pressed on the slider, the clamping force of the slider and the clamping portion is combined, the slider is prevented from moving vertically, the slider support wraps the slider and the locking block inside, the slider and the locking block are prevented from moving in the width direction of the support, and therefore the fixing stability and the position stability of the clamping device in the support groove are completely guaranteed, and the stable and accurate operation of an executing part is guaranteed.
Preferably, the sliding block support comprises a support body, a hollowed-out part, a sleeving part and a mounting part, wherein the hollowed-out part is arranged at the top of the hollowed-out part and is used for connecting the sliding block to a column, the transverse length of the hollowed-out part is matched with the width of the support, and the vertical length of the hollowed-out part is larger than the vertical length of the support, and the mounting part is arranged below the hollowed-out part and is used for mounting the execution part; and the bottom of the installation part is provided with an installation hole which is matched with the execution part.
The shape of the horizontal projection plane of the sliding block is the same as that of the horizontal projection plane of the locking block, the length of the sliding block is the same as that of the transverse projection plane of the hollowing part, the sliding block and the locking block are restrained by the sliding block support in the length direction, the sliding block and the locking block are restrained by the transverse groove and the vertical groove in the width direction, the stability of the positions of the sliding block and the locking block and the track searching property during movement are guaranteed, and meanwhile the sliding block support can freely translate in the vertical plane under the limit premise of the width of the support, so that the whole movement of the clamping device is more accurate and convenient. The mounting hole is arranged at the bottom of the mounting part, and the top of the execution part is provided with a connecting hole which is suitable for stable connection by adopting the conventional modes such as bolt connection and the like.
Preferably, the sliding block supporting column comprises a top sleeve joint connected with the sleeving part, a bottom clamping joint connected with the sliding block and a column body connected with the top sleeve joint and the bottom clamping joint; the column body comprises an upper column body and a lower column body which are detachably connected, the upper column body is fixedly connected with the top sleeve joint coaxially, and the lower column body is fixedly connected with the bottom clamping joint coaxially; the tightening spring is sleeved on the column body.
Thereby conveniently realize that the slider supports the post and is connected with slider support and slider, prop tight spring upper end and cover portion bottom surface and meet, when slider support reciprocates, cover portion bottom surface compression or the east prop tight spring, realize propping tight force's size adjustment.
Preferably, the top sleeve joint is provided with a step, and the sleeve joint part is provided with a stepped hole which forms a limit with the step; the length of the large-diameter hole of the stepped hole is longer than the vertical length of the bracket groove; the telescopic travel of the tightening spring is longer than the length of the large-diameter hole of the stepped hole; the vertical length of the hollowed-out part is not less than the sum of the length of the large-diameter hole of the stepped hole and the vertical length of the bracket groove.
Therefore, when the clamping device is directly switched and connected with different bracket grooves, the top part of the bracket body falls onto the locking block through the compression spring, a space larger than the bracket grooves is formed between the bottom of the sliding block and the hollowed-out part, and under the condition of keeping the state, the sliding block and the locking block are integrally separated from the constraint of the bracket grooves in the vertical height, so that the switching of the clamping device among different bracket grooves is realized; meanwhile, the reliable supporting force of the supporting spring is ensured all the time.
Preferably, the sliding block comprises a vertical hole which is matched with the bottom clamping joint and penetrates through the upper bottom surface and the lower bottom surface of the sliding block; the clamping hole is formed in the sliding block and is perpendicular to the vertical hole; the horizontal plane projection of the vertical hole is in the horizontal plane projection of the clamping hole.
The vertical hole is used for adapting to the bottom clamping joint, so that the lower column body is mounted on the sliding block, and the lower column body and the sliding block are convenient to connect and disconnect; the whole blind hole that is a square of joint hole, all have the interval between the bottom surface about with the slider, and its horizontal direction's width and length are all greater than the size of bottom joint for bottom joint can be followed the pore wall in perpendicular hole translates and simultaneously with the cylinder is rotatory as the axle, and as long as bottom joint's position is not just overlapped with perpendicular hole, bottom joint just can not fall out outside the slider.
Preferably, the locking block comprises a locking head arranged at one edge of the bottom of the locking block, a secondary locking head arranged at the other edge of the bottom of the locking block, a through hole vertically penetrating through the locking block, and a spring mounting groove coaxially arranged on the top surface of the locking block with the through hole; the lower end face of the auxiliary locking head is flush with the lower end face of the locking head.
The through holes are used for enabling the sliding block supporting columns to penetrate through so as to be connected with the sliding blocks, the spring mounting grooves are connected with the lower ends of the supporting springs, and the supporting springs are provided with a force application surface and circumferential constraint, so that the supporting springs are stable in mounting and acting; the locking head is adaptive to the width of the clamping part, and is inserted between the sliding block and the transverse groove wall when the sliding block completely slides into the clamping part, so that the limiting of the sliding block in the length direction of the bracket is completed; the lower end face of the auxiliary locking head is flush with the lower end face of the locking head, so that the locking block can be completely flatly placed on the top face of the sliding block after being completely separated from the sliding block, and the sliding block and the locking block are ensured to be taken conveniently without obstruction when moving vertically at the same time.
Preferably, the top surface of the sliding block is provided with a locking groove which is matched with the auxiliary locking head, and the locking groove is communicated with the clamping hole and the top surface of the sliding block.
The locking groove is perpendicular to the length direction in the horizontal plane of the vertical hole, the auxiliary locking head is inserted into the locking groove when the locking head is inserted between the sliding block and the transverse groove wall, so that the locking block is kept vertical when being connected with the sliding block, sufficient contact area is ensured, the clamping joint is connected with the clamping hole, namely, the clamping joint and the vertical hole are in dislocation in the vertical direction, the auxiliary locking head extending into the clamping hole can be effectively limited, and the clamping joint is prevented from sliding out.
Preferably, the locking block is provided with a threaded connection column on the lateral surface of the bracket in the width direction, and the bracket body is provided with a vertical connection groove which is matched with the radial section of the threaded connection column.
The locking piece and the bracket body are fixedly connected through the threaded connecting column, the corresponding nuts and other fasteners, so that the compression degree of the tightening spring can be accurately adjusted according to tightening forces required by different requirements, and the tightening forces can be maintained.
Preferably, the sliding block is provided with an extension rod on the lateral surface of the width direction of the bracket, and the bracket body is provided with a transverse connecting groove which is matched with the radial section of the extension rod; the transverse connecting groove is communicated with the vertical connecting groove, and the transverse connecting groove is provided with two extending cavities extending along the length direction of the bracket; the two extending cavities are symmetrically arranged relative to the vertical connecting groove, and the depth of each extending cavity is matched with the depth of each clamping part.
The arrangement of the extension rod is convenient for a person to hold, so that the connection of the sliding block is more convenient; the extending cavities are symmetrically arranged on two sides of the vertical connecting groove, and the depth of the extending cavities is matched with that of the clamping part, so that the bracket grooves on two sides of the sliding block and the ejector rod can be quickly installed; the cooperation of extension pole and extension chamber to and the cooperation of threaded connection post and vertical spread groove can also prevent the deviation of device position as insurance structure when encountering the connection failure of slider and block portion.
Preferably, the plurality of transverse connecting grooves are arranged at intervals along the axial direction of the vertical connecting groove, and the plurality of transverse grooves are arranged in correspondence with the plurality of transverse connecting grooves.
Therefore, the clamping device is integrally provided with a plurality of mounting positions along the vertical direction of the bracket, and a larger mounting height range and a larger usable range of the tightening force of the tightening spring are obtained.
In summary, the invention has the following beneficial effects:
the clamping device of the woodworking tool executive component is characterized in that the sliding block limits the up-and-down movement of the whole device, the locking block limits the sliding block to move in the length direction of the bracket, the sliding block support, the locking block and the sliding block are connected in series by the sliding block support column, the sliding block is always supported on the bottom surface of the transverse groove, the supporting spring provides a downward force, the locking block is always pressed on the sliding block, the clamping force of the sliding block and the clamping part is combined, the sliding block is prevented from moving vertically, the sliding block support wraps the sliding block and the locking block inside, the sliding block and the locking block are prevented from moving in the width direction of the bracket, and therefore the fixing stability of the clamping device in the bracket groove is completely ensured, the position is stable, and the stable and accurate operation of the executive component is ensured; and a connecting structure is arranged between the end face of the slide block and the locking block in the width direction of the support and the slide block support, so that the clamping device can adjust the strength of the slide block and the height of the clamping device on a woodworking tool in a larger range, and the usability and the reliability of the device are improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention;
FIG. 2 is an exploded view of the connection of the components of the clamping device to the bracket and the actuator;
FIG. 3 is a schematic view of a slider bracket;
FIG. 4 is a schematic view of a slider abutment;
FIG. 5 is a schematic view of a slider structure;
fig. 6 is a schematic view of the structure of the lock block.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and preferred embodiments.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Examples: as shown in fig. 1-6, a clamping device for a woodworking tool execution component is used for connecting the execution component 300 to a support 100 of a woodworking tool, and is characterized in that: the bracket is provided with a bracket groove 12 for connecting a clamping device; the bracket groove comprises a transverse groove 121 and a vertical groove 122 which are communicated with each other and transversely penetrate through the width direction of the bracket, the transverse groove is positioned at the lower part of the vertical groove, and the transverse groove is provided with an engaging part 1221 protruding out of the vertical groove in the length direction of the bracket; the clamping device comprises a sliding block 41 sliding in the transverse groove, a locking block 42 for locking or releasing the sliding block and sliding along the groove wall of the vertical groove, a sliding block propping column 43 propping the sliding block 41 on the bottom surface of the transverse groove, a supporting spring 44 providing propping force for the sliding block propping column, and a sliding block bracket 45 vertically and sequentially connecting the sliding block propping column, the locking block, the sliding block and the executing component.
The slide block bracket comprises a bracket body 451, a hollowed-out part 452, a sleeving part 453 and an installation part 454, wherein the hollowed-out part 452 is arranged in the middle of the bracket body, the transverse length of the hollowed-out part is matched with the width of the bracket, the vertical length of the hollowed-out part is greater than the vertical length of the bracket, the sleeving part 453 is arranged at the top of the hollowed-out part and is used for connecting a slide block supporting column, and the installation part 454 is arranged below the hollowed-out part and is used for installing an execution part; the bottom of the mounting part is provided with a mounting hole which is matched with the execution part.
The sliding block propping column comprises a top sleeve joint 431 connected with the sleeving part, a bottom clamping joint 432 connected with the sliding block and a column 433 connected with the top sleeve joint and the bottom clamping joint; the column body comprises an upper column body and a lower column body which are detachably connected, wherein the upper column body is fixedly connected with the top sleeve joint coaxially, and the lower column body is fixedly connected with the bottom clamping joint coaxially; the tightening spring is sleeved on the column body.
The top sleeve joint is provided with a step, and the sleeve joint part is provided with a stepped hole which forms limit with the step; the length of the large-diameter hole of the stepped hole is longer than the vertical length of the bracket groove; the telescopic travel of the tightening spring is longer than the length of the large-diameter hole of the stepped hole; the vertical length of the hollowed-out part is not less than the sum of the length of the large-diameter hole of the stepped hole and the vertical length of the bracket groove.
The sliding block comprises a vertical hole 411 which is matched with the bottom clamping joint and penetrates through the upper bottom surface and the lower bottom surface of the sliding block; a clamping hole 412 which is arranged in the slide block and is perpendicular to the vertical hole; the horizontal plane projection of the vertical hole is in the horizontal plane projection of the clamping hole.
The locking block comprises a locking head 421 arranged at one edge of the bottom of the locking block, a secondary locking head 422 arranged at the other edge of the bottom of the locking block, a through hole 423 vertically penetrating the locking block, and a spring mounting groove 424 coaxially arranged on the top surface of the locking block with the through hole; the lower end face of the auxiliary locking head is flush with the lower end face of the locking head.
The top surface of the sliding block is provided with a locking groove 413 which is matched with the auxiliary locking head, and the locking groove is communicated with the clamping hole and the top surface of the sliding block.
The locking block is provided with a threaded connecting column 426 on the side surface of the width direction of the bracket, and a vertical connecting groove 455 which is adapted to the radial section of the threaded connecting column is arranged on the bracket body.
The slide block is provided with an extension rod 414 on the lateral surface of the width direction of the support, and a transverse connecting groove 456 which is adapted to the radial section of the extension rod is arranged on the support body; the transverse connecting groove is communicated with the vertical connecting groove, and the transverse connecting groove is provided with two extending cavities 457 which extend along the length direction of the bracket; the two extending cavities are symmetrically arranged about the vertical connecting groove, and the depth of the extending cavities is matched with the depth of the clamping part.
The transverse connecting grooves are arranged at intervals along the axial direction of the vertical connecting grooves, and the transverse grooves are arranged in a plurality of mode in correspondence with the transverse connecting grooves.
Claims (6)
1. A clamping device for a woodworking tool execution component, for connecting the execution component (300) to a support (100) of a woodworking tool, characterized in that: a bracket groove (12) for connecting the clamping device is formed in the bracket; the bracket groove (12) comprises a transverse groove (121) and a vertical groove (122) which are communicated with each other and transversely penetrate through the width direction of the bracket, the transverse groove (121) is positioned at the lower part of the vertical groove (122), and the transverse groove (121) is provided with an engaging part (1221) protruding out of the vertical groove (122) in the length direction of the bracket; the clamping device comprises a sliding block (41) sliding in the transverse groove, a locking block (42) used for locking or releasing the sliding block (41) and sliding along the groove wall of the vertical groove (122), a sliding block propping column (43) propping the sliding block (41) on the bottom surface of the transverse groove (121), a tightening spring (44) providing propping force for the sliding block propping column (43), and a sliding block bracket (45) vertically and sequentially connected with the sliding block propping column (43), the locking block (42), the sliding block (41) and the executing component;
the sliding block support (45) comprises a support body (451), a hollowed-out part (452) which is arranged in the middle of the support body, has a transverse length corresponding to the width of the support and a vertical length greater than the vertical length of the support, a sleeved part (453) which is arranged at the top of the hollowed-out part and is used for connecting the sliding block support column (43), and an installation part (454) which is arranged below the hollowed-out part and is used for installing the execution part; the installation part is provided with an installation cavity for installing the execution part;
the sliding block supporting column (43) comprises a top sleeve joint (431) connected with the sleeve part, a bottom clamping joint (432) connected with the sliding block (41) and a column body (433) connected with the top sleeve joint (431) and the bottom clamping joint; the column body comprises an upper column body and a lower column body which are detachably connected, the upper column body is fixedly connected with the top sleeve joint (431) in a coaxial manner, and the lower column body is fixedly connected with the bottom clamping joint in a coaxial manner; the tightening spring is sleeved on the column body;
the sliding block (41) comprises a vertical hole (411) which is matched with the bottom clamping connector and penetrates through the upper bottom surface and the lower bottom surface of the sliding block (41); a clamping hole (412) which is arranged in the sliding block (41) and is perpendicular to the vertical hole; the horizontal plane projection of the vertical hole is in the horizontal plane projection of the clamping hole;
the locking block (42) comprises a locking head (421) arranged at one edge of the bottom of the locking block (42), a secondary locking head (422) arranged at the other edge of the bottom of the locking block (42), a through hole (423) vertically penetrating through the locking block (42), and a spring mounting groove (424) coaxially arranged with the through hole and arranged on the top surface of the locking block (42); the lower end face of the auxiliary locking head is flush with the lower end face of the locking head; the through hole (423) is used for enabling the sliding block supporting column (43) to pass through so as to be connected with the sliding block (41), and the spring mounting groove (424) is connected with the lower end of the tightening spring (44); the locking head (421) is adaptive to the width of the clamping part (1221), and is inserted between the sliding block and the transverse groove wall when the sliding block completely slides into the clamping part (1221), so that the limiting of the sliding block in the length direction of the bracket is completed.
2. The apparatus for clamping a wood working implement according to claim 1, wherein: the top sleeve joint (431) is provided with a step, and the sleeve part (453) is provided with a stepped hole which forms a limit with the step; the length of the large-diameter hole of the stepped hole is longer than the vertical length of the bracket groove (12); the telescopic travel of the tightening spring is longer than the length of the large-diameter hole of the stepped hole; the vertical length of the hollowed-out part (452) is not less than the sum of the length of the large-diameter hole of the stepped hole and the vertical length of the bracket groove (12).
3. The apparatus for clamping a wood working implement according to claim 1, wherein: the top surface of the sliding block (41) is provided with a locking groove (413) which is matched with the auxiliary locking head (422), and the locking groove is communicated with the clamping hole and the top surface of the sliding block (41).
4. The apparatus for clamping a wood working implement according to claim 1, wherein: the locking block (42) is provided with a threaded connecting column (426) on the lateral surface of the width direction of the support, and the support body is provided with a vertical connecting groove (455) which is matched with the radial section of the threaded connecting column.
5. The apparatus for clamping a wood working tool actuator of claim 4 wherein: the sliding block (41) is provided with an extension rod (414) on the lateral surface of the width direction of the bracket, and the bracket body is provided with a transverse connecting groove (456) which is matched with the radial section of the extension rod; the transverse connecting groove (456) is communicated with the vertical connecting groove (455), and the transverse connecting groove (456) is provided with two extending cavities (457) which extend along the length direction of the support; the two extending cavities are symmetrically arranged relative to the vertical connecting groove (455), and the depth of the extending cavities is matched with the depth of the clamping part.
6. The apparatus for clamping a wood working tool actuator of claim 5 wherein: the transverse connecting grooves (456) are arranged at intervals along the axial direction of the vertical connecting grooves (455), and the transverse grooves (121) are arranged in a plurality in correspondence with the transverse connecting grooves (456).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810229771.6A CN108177204B (en) | 2018-03-20 | 2018-03-20 | Clamping device for woodworking tool execution part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810229771.6A CN108177204B (en) | 2018-03-20 | 2018-03-20 | Clamping device for woodworking tool execution part |
Publications (2)
| Publication Number | Publication Date |
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| CN108177204A CN108177204A (en) | 2018-06-19 |
| CN108177204B true CN108177204B (en) | 2023-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810229771.6A Active CN108177204B (en) | 2018-03-20 | 2018-03-20 | Clamping device for woodworking tool execution part |
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| CN (1) | CN108177204B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116689188B (en) * | 2023-08-01 | 2023-10-20 | 江苏安江汽车部件有限公司 | Automobile decorative plate paint spraying conveying line and working method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2015635A (en) * | 1934-09-13 | 1935-09-24 | Peco Mfg Corp | Grooving device |
| JPH0750165Y2 (en) * | 1989-07-28 | 1995-11-15 | 株式会社平安コーポレーション | Spindle head device for woodworking router |
| DE102015016221A1 (en) * | 2015-12-04 | 2017-06-08 | Michael Weinig Ag | Pressure device for a machine tool for machining workpieces made of wood, plastic and the like, and a machine tool with at least one pressure device |
| CN106738095B (en) * | 2017-02-04 | 2022-07-12 | 曲艺 | Woodworking compound milling machine |
| CN107322707A (en) * | 2017-07-29 | 2017-11-07 | 扬州市大悦信息科技有限公司 | A kind of producing device of circular plank |
| CN208231969U (en) * | 2018-03-20 | 2018-12-14 | 湖州职业技术学院 | A kind of clamping device of wood working tool execution unit |
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2018
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