CN211590530U

CN211590530U - Tenoning snap gauge and tenoning mechanism

Info

Publication number: CN211590530U
Application number: CN201922064399.0U
Authority: CN
Inventors: 吴新
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-09-29
Anticipated expiration: 2029-11-26

Abstract

The utility model relates to a tenoning snap gauge and a tenoning mechanism, wherein the tenoning snap gauge comprises a snap gauge body; at least one side of the caliper body is provided with at least one dimension mortise and at least one dimension tenon with the same width as the corresponding dimension mortise. The tenoning mechanism comprises a tenoning caliper gauge, a backer and a milling head; the backer comprises a backer body; the front surface of the backer is provided with a first positioning sheet and a second positioning sheet which can slide left and right along the backer; the front end of the first positioning sheet is provided with a first positioning tooth; the front end of the second positioning piece is provided with a second positioning tooth. The tenon cutting caliper gauge and the tenon cutting mechanism of the utility model have the advantages that the tenon cutting caliper gauge is beneficial to the rapid positioning during the tenon cutting, and the positioning is accurate; the tenon mortise structure size of preparation is accurate, and the cooperation is perfect, need not to measure many times, also need not to reprocess and comes the adjustment, one shot forming, labour saving and time saving has also reduced the processing cost.

Description

Tenoning snap gauge and tenoning mechanism

Technical Field

The utility model relates to a carpenter's instrument field especially relates to a tenoning snap gauge and tenoning mechanism.

Background

When a woodworker is manufactured, tenoning operation is sometimes needed, a large-scale factory has a special tenoning machine, and when a person carries out woodworking DIY, the size of the tenoning needs to be measured for many times, and then a tenoning tool is adjusted, although tenoning can also be realized; however, many measurements still have some errors, and when the mortise and tenon joints are matched, the mortise and tenon joints are not tight or too tight, and are adjusted by processing many times, so that time and labor are wasted, and sometimes the whole material is lost.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a tenoning snap gauge and a tenoning mechanism, wherein the tenoning snap gauge is helpful for quick positioning during tenoning and accurate positioning; the tenon cutting mechanism is matched with the tenon cutting caliper gauge, so that the tenon cutting can be rapidly performed, the operation is convenient, the size of the manufactured tenon-and-mortise structure is accurate, the matching is perfect, the repeated measurement is not needed, the adjustment is not needed to be processed, the one-step forming is realized, the time and the labor are saved, the processing cost is also reduced, the interest of a user in performing woodworking DIY is improved, and the confidence of the user in the woodworking DIY is increased.

The utility model provides a technical scheme that its technical problem adopted is: a tenoning caliper comprises a caliper body; at least one side of the caliper body is provided with at least one size mortise and at least one size tenon with the same width as the corresponding size mortise.

The size mortise is used for determining the width of the mortise for materials to be tenoned; the dimension tenon is used for determining the width of the tenon between two adjacent mortises.

The caliper body is provided with a plurality of size mortises and size tenons with the number corresponding to the size mortises; the same one side of each size tongue-and-groove sets up to the size tenon of the size width that corresponds with this size tongue-and-groove, and the opposite side sets up to the size tenon of the size width that corresponds with the size tongue-and-groove that this size tongue-and-groove was adjacent on the opposite side.

A tenoning mechanism adopting a tenoning snap gauge comprises the tenoning snap gauge, a backer and a milling head; the backer comprises a backer body; the front surface of the backer body is provided with a first positioning sheet and a second positioning sheet which can slide left and right along the backer body; the front end of the first positioning piece is provided with a first positioning tooth; the front end of the second positioning piece is provided with a second positioning tooth; determining the distance between the second positioning tooth and the inner side edge of the widest part of the milling head through the size tenon head of the tenoning caliper gauge; the distance of the outer side edge between the first positioning tooth and the second positioning tooth is determined by the size mortise of the size corresponding to the size tenon.

The front surface of the backer body is provided with a sliding chute in the left-right direction; the first positioning piece and the second positioning piece are assembled with the sliding groove through the adjustable sliding block locking piece, and the first positioning piece and the second positioning piece slide left and right along the backer body and are locked and positioned.

The cross section of the sliding chute is in a cross shape; the adjustable sliding block locking piece comprises a fastening bolt and a T-shaped sliding block matched with the sliding groove; the stud of the fastening bolt penetrates through the locked piece and then is in threaded connection with the T-shaped sliding block; when the T-shaped sliding block is locked, the fastening bolt is rotated to tighten the T-shaped sliding block, so that the T-shaped sliding block and the sliding groove are locked.

The first positioning piece is arranged on the front side of the second positioning piece, and a long hole in the left-right direction is formed in the first positioning piece; a stud of a fastening bolt of one adjustable slide block locking piece penetrates through one end of the second positioning piece to be connected with a corresponding T-shaped slide block in the sliding groove; the other adjustable slide block locking piece penetrates through the long hole of the first positioning piece and the second positioning piece through the stud of the fastening bolt and then is connected with the corresponding T-shaped slide block in the sliding groove; the caliper body is further provided with a half hole or a through hole for avoiding a rotary tool when the fastening bolt is rotated.

The first positioning piece and the second positioning piece are both arranged in an L shape, the first positioning piece is placed on the second positioning piece, and the top surface of the vertical end of the first positioning piece is flush with the top surface of the vertical rear end of the second positioning piece; the front surface of the horizontal end of the first positioning sheet is flush with the front surface of the horizontal end of the second positioning sheet; the first positioning teeth are arranged on the front side of the horizontal end of the first positioning sheet; the second positioning teeth are arranged on the front side of the horizontal end of the second positioning piece; the front end of the first positioning tooth is flush with the front end of the second positioning tooth; a backing plate is further fixed on the front side of the backing body; the backup plate is provided with windows in the areas of the first positioning piece and the second positioning piece; the front end surface of the backup plate is positioned at the tooth bodies of the first positioning teeth and the second positioning teeth, so that the backup plate forms a working surface of the backup, and the first positioning teeth and the second positioning teeth are exposed out of the working surface of the backup to realize size positioning; the backup plate can be grooved by the milling head; the backer body is provided with the fluting in the position that corresponds with the cutting region of backup plate and dodges the district.

The back of the backer body is also provided with a sliding chute in the left-right direction; an L-shaped fixing piece is arranged on the rear side of the backer body; a sliding strip in the front-back direction is fixed at the horizontal bottom end of the L-shaped fixing piece; the vertical front end of the L-shaped fixing piece is assembled with the sliding groove in the back of the backer body through the adjustable sliding block locking piece, so that the backer body can slide left and right and can be locked and positioned relative to the L-shaped fixing piece.

The sliding strip is assembled with a T-shaped track groove embedded in the front and back directions of the workbench; a plurality of clamping rings are fixed on the bottom side of the sliding strip, the clamping rings and the sliding strip form a T-shaped structure to be matched with the T-shaped track groove for use, and the tightness degree of the sliding strip and the T-shaped track groove in the vertical direction is controlled by adjusting the height of the clamping rings relative to the sliding strip; the top side of the sliding strip is also provided with a plurality of tensioning rings, and the tightness degree of the sliding strip and the T-shaped track groove in the left and right directions is controlled by adjusting the tensioning rings; the milling head upwards passes through the workbench and is exposed in front of the backer; the backer is close to or is far away from the milling head forward along T-shaped track groove through the draw runner.

The utility model has the advantages that: the tenon cutting caliper gauge and the tenon cutting mechanism of the utility model have the advantages that the tenon cutting caliper gauge is beneficial to the rapid positioning during the tenon cutting, and the positioning is accurate; the design of tenoning mechanism through first location tooth and second location tooth can with milling cutter head cooperation tenoning callipers, realizes the location of a plurality of sizes, and then realizes quick tenoning, convenient operation, the tenon fourth of the twelve earthly branches structure size of preparation is accurate, the cooperation is perfect, need not to measure many times, also need not to reprocess and come the adjustment, one shot forming, labour saving and time saving has also reduced the processing cost, the user has improved the enjoyment that the user carries out carpenter DIY, increase user to carpenter DIY's confidence.

Drawings

FIG. 1 is a schematic front view of an embodiment of a tenoning calliper;

FIG. 2 is a perspective view of an embodiment of a tenoning calliper;

FIG. 3 is a schematic front view of a backer of an exemplary mortise opening mechanism;

FIG. 4 is a schematic cross-sectional view A-A of FIG. 3;

FIG. 5 is a schematic view of a method of using an embodiment of a mortise mechanism;

FIG. 6 is a schematic view of a sample made by one tenoning mechanism of an embodiment.

Detailed Description

In order to deepen the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and embodiments, which are only used for explaining the present invention and are not limited to the protection scope of the present invention.

Examples

As shown in fig. 1 and 2, the present embodiment provides a tenoning caliper, which includes a caliper body 1; at least one side of the caliper body 1 is provided with at least one dimension mortise 101 and at least one dimension tenon 102 with the same width as the corresponding dimension mortise 101.

In a tenoning caliper of this embodiment, the size mortise 101 is used to determine the width of the mortise of the material to be tenoned; the size tenon 102 is used to determine the width of the tenon between two adjacent mortises.

In the tenoning caliper of this embodiment, the caliper body 1 is provided with a plurality of size mortises 101 and size tenons 102 corresponding to the size mortises 101 in number; the same one side of each size tongue-and-groove sets up to the size tenon of the size width that corresponds with this size tongue-and-groove, and the opposite side sets up to the size tenon of the size width that corresponds with the size tongue-and-groove that this size tongue-and-groove was adjacent on the opposite side.

In the tenoning snap gauge of the embodiment, the upper end and the lower end of the tenoning snap gauge are both provided with the size mortise and the size tenon, the top side is made of English, the top side is correspondingly 3/16 inches, 1/4 inches, 5/16 inches, 3/8 inches and 1/2 inches, the size mortise and the size tenon on the right side are arranged from left to right in sequence from small to large, and the size mortise and the size tenon on the right side are consistent in size; the bottom side is metric size, and is arranged from left to right from small to big correspondingly for 5 millimeters, 6 millimeters, 8 millimeters, 10 millimeters and 12 millimeters in proper order, and the size tongue-and-groove is unanimous with the size tenon's on right side size.

As shown in fig. 3, 4 and 5, the present embodiment further provides a tenoning mechanism using a tenoning calliper, which includes the tenoning calliper, and further includes a backer 2 and a milling head 3; the backer 2 includes a backer body 21; the front surface of the backer main body 21 is provided with a first positioning sheet 23 and a second positioning sheet 24 which can slide left and right along the backer main body 21; the front end of the first positioning sheet 23 is provided with a first positioning tooth 2301; the front end of the second positioning piece 24 is provided with a second positioning tooth 2401; the distance of the inner side edge between the second positioning tooth 2401 and the widest part of the milling head 3 is determined through the size tenon 102 of the tenoning caliper; the spacing of the outside edges between first positioning tooth 2301 and second positioning tooth 2401 is determined by a size mortise 101 of a size corresponding to this size tenon 102.

In the tenon opening mechanism of this embodiment, a sliding groove 2101 in the left-right direction is provided on the front surface of the backer main body 21; the first positioning piece 23 and the second positioning piece 24 are assembled with the chute 2101 through the adjustable slide block locking piece 25, so that the first positioning piece 23 and the second positioning piece 24 slide left and right along the backer body 21 and are locked and positioned.

In the tenon opening mechanism of this embodiment, the cross section of the chute 2101 is cross-shaped; the adjustable slide locking piece 25 comprises a fastening bolt 2501 and a T-shaped slide 2502 used for being matched with the sliding groove 2101; a stud of the fastening bolt 2501 penetrates through the locked piece and then is in threaded connection with the T-shaped sliding block 2502; when locking, the fastening bolt 2501 is rotated to tighten the T-shaped sliding block 2502, so that the T-shaped sliding block 2502 is locked with the sliding groove 2101.

In the tenon-making mechanism of the present embodiment, the first positioning piece 23 is arranged at the front side of the second positioning piece 24, and the first positioning piece 23 is further provided with a long hole 2302 in the left-right direction; one end of a stud of a fastening bolt 2501 of one adjustable slider locking member 25, which penetrates through a second positioning piece 24, is connected with a corresponding T-shaped slider 2502 in the sliding groove 2101; another adjustable slide block locking piece 25 passes through the long hole 2302 of the first positioning piece 23 and the second positioning piece 24 through the stud of the fastening bolt 2501 and then is connected with the corresponding T-shaped slide block 2502 in the sliding groove 2101; the caliper body 1 is further provided with a half hole or a through hole 103 for avoiding a rotary tool when the fastening bolt 2501 is rotated.

In the tenon opening mechanism of the present embodiment, the first positioning piece 23 and the second positioning piece 24 are both L-shaped, the first positioning piece 23 is placed on the second positioning piece 24, and the top surface of the upright end of the first positioning piece 23 is flush with the top surface of the upright rear end of the second positioning piece 24; the front surface of the horizontal end of the first positioning sheet 23 is flush with the front surface of the horizontal end of the second positioning sheet 24; the first positioning teeth 2301 are arranged at the front side of the horizontal end of the first positioning piece 23; the second positioning teeth 2401 are arranged on the front side of the horizontal end of the second positioning sheet 24; the front end of the first positioning tooth 2301 is flush with the front end of the second positioning tooth 2401; a backup plate 22 is fixed on the front side of the backer body 21; the backup plate 22 is provided with windows in the areas corresponding to the first positioning piece 23 and the second positioning piece 24; the front end surface of the backup plate 22 is positioned at the tooth bodies of the first positioning tooth 2301 and the second positioning tooth 2401, so that the backup plate 22 forms a working surface of the backup 2, and the first positioning tooth 2301 and the second positioning tooth 2401 are exposed out of the working surface of the backup 2 to realize size positioning; the backup plate 22 can be grooved by a milling head; the backer body 21 is provided with a groove avoiding area at a position corresponding to a cutting area of the backup plate 22.

In the tenon-making mechanism of this embodiment, a sliding groove 2101 in the left-right direction is also provided on the back of the backer body 1; an L-shaped fixing piece 2102 is arranged on the rear side of the backer body 1; a slide bar 26 in the front-back direction is fixed at the horizontal bottom end of the L-shaped fixing part 2102; the vertical front end of the L-shaped fixing member 2102 is assembled with a chute 2101 on the back of the backer body 1 by an adjustable slider locking member 25, so that the backer body 1 can slide left and right and can be locked and positioned relative to the L-shaped fixing member 2102.

In a mortise mechanism of this embodiment, the slide bar 26 is fitted with a T-shaped rail groove 27 in the front-rear direction embedded in the table; a plurality of clamping rings 2601 are fixed on the bottom side of the slide bar 26, the clamping rings 2601 and the slide bar 26 form a structure similar to a T shape and are matched with the T-shaped track groove 27 for use, and the tightness degree of the slide bar 26 and the T-shaped track groove 27 in the vertical direction is controlled by adjusting the height of the clamping rings 2601 relative to the slide bar 26; the top side of the sliding strip 26 is also provided with a plurality of tensioning rings 2602, and the tightness degree of the sliding strip 26 and the T-shaped track groove 27 in the left and right directions is controlled by adjusting the tensioning rings 2602; the milling head 3 upwards passes through the workbench and is exposed in front of the backer 2; the backer 2 is moved forward toward or rearward away from the milling head 3 along the T-shaped track groove 27 by the slide 26.

As shown in fig. 5, in the tenoning mechanism of this embodiment, the size width of the selected size mortise and size tenon and the size width of the slot of the milling head are the same as the size width of the tenon to be tenoned, taking 8mm width as an example: preparing before tenoning, mounting the backer in a T-shaped track groove on a working table, and adjusting the tightness of the backer up and down, left and right to ensure that the backer moves smoothly without shaking; adjusting the height of the milling head to be not higher than the depth of a size mortise of the tenon calliper gauge, enabling the front end face of the backer to be close to the milling head, adjusting the milling head to enable the connecting line of two blade edges (namely the widest part of the milling head) to be parallel to the backer, opening an adjustable sliding block locking piece on the back of the backer body to enable the backer body to be loosened from the L-shaped fixing piece, placing the tenon calliper gauge on the front side of the backer, moving the backer body left and right to enable the size tenon of 8mm of the tenon calliper gauge to be clamped between the second positioning tooth and the blade edge on the left side of the milling cutter, and then locking the adjustable sliding block locking piece on the back of the backer body to enable the backer body and the L-shaped fixing piece to be locked; open the adjustable slide retaining member of the microscler hole department of the positive first locating piece of backer body (if the tenoning snap gauge has the sheltering from to the adjustable slide retaining member of first locating piece, can make the instrument of screwing pass through the through-hole on the tenoning snap gauge or the marginal half-hole screw, the design of the through-hole position on the tenoning snap gauge is according to the adjustable slide retaining member corresponding position of tenoning snap gauge with microscler hole department when not unidimensional position is place before the backer and definite), make first locating piece remove about can, remove first locating piece and make the left side of first locating tooth support on the left side inner wall of 8mm size tongue-and-groove, then, locking adjustable slide retaining member makes first locating piece locking location, take off the tenoning snap gauge, namely obtain three size: the distance d1 between the outer edges of the first positioning rule and the second positioning rule, the distance d2 between the inner edges of the second positioning rule and the milling cutter, and the dimension (tenoning width) d3 of the connecting line of the two blade edges of the milling cutter head, wherein the three dimensions are 8 mm; then, a notch through which a milling cutter head passes is formed in the backup plate, the milling cutter head is raised in multiple times to form the notch in order to ensure that the notch is neat, finally, the height of the milling cutter is raised and adjusted to be consistent with the thickness of a wood plate to be tenoned, and then the backup plate is notched, namely, preparation before tenoning is completed; when tenoning, the left side of a wood board to be tenoned is attached to the right end of the second positioning tooth, the backer is moved to push the wood board to pass through the milling cutter, a first mortise is obtained on the wood board, the first mortise of the wood board is clamped on the outer edges of the first positioning tooth and the second positioning tooth, the backer is moved to open a second mortise for a material, and by analogy, after the mortise is opened at one end of the wood board, the same mortise is opened at the opposite side of the wood board, and the mortise is opened in the same way for another wood board which is the same as the wood board; then, turning the first wood board left and right, clamping the first mortise on the outer side edges of the first positioning teeth and the second positioning teeth, abutting the left end of the wood board to be in mortise-tenon connection with the first wood board on the right end face of the first wood board turned left and right, pushing the backer to perform slotting operation of the first mortise, then clamping the first mortise of the wood board on the outer side edges of the first positioning teeth and the second positioning teeth, pushing the backer to perform slotting of the second mortise, and so on, after slotting the mortise on one end of the wood board, slotting the same mortise on the opposite side of the wood board, and slotting the same mortise on the other wood board in the same way; after the mortises are opened on the four wood boards, the samples shown in the figure 6 can be spliced.

According to the tenoning snap gauge and the tenoning mechanism, the tenoning snap gauge is beneficial to quick positioning and accurate positioning during tenoning; the design of tenoning mechanism through first location tooth and second location tooth can with milling cutter head cooperation tenoning callipers, realizes the location of a plurality of sizes, and then realizes quick tenoning, convenient operation, the tenon fourth of the twelve earthly branches structure size of preparation is accurate, the cooperation is perfect, need not to measure many times, also need not to reprocess and come the adjustment, one shot forming, labour saving and time saving has also reduced the processing cost, the user has improved the enjoyment that the user carries out carpenter DIY, increase user to carpenter DIY's confidence.

The above-mentioned embodiments should not limit the present invention in any way, and all the technical solutions obtained by adopting equivalent replacement or equivalent conversion fall within the protection scope of the present invention.

Claims

1. A tenoning snap gauge is characterized in that: comprises a caliper body; at least one side of the caliper body is provided with at least one size mortise and at least one size tenon with the same width as the corresponding size mortise.

2. A mortising calliper according to claim 1 characterised in that: the size mortise is used for determining the width of the mortise for materials to be tenoned; the dimension tenon is used for determining the width of the tenon between two adjacent mortises.

3. A mortising calliper according to claim 2 characterised in that: the caliper body is provided with a plurality of size mortises and size tenons with the number corresponding to the size mortises; the same one side of each size tongue-and-groove sets up to the size tenon of the size width that corresponds with this size tongue-and-groove, and the opposite side sets up to the size tenon of the size width that corresponds with the size tongue-and-groove that this size tongue-and-groove was adjacent on the opposite side.

4. A mortise mechanism using the mortise gauge of any one of claims 1, 2 or 3, wherein: the tenon-making caliper gauge comprises a tenon-making caliper gauge, a backer and a milling head; the backer comprises a backer body; the front surface of the backer body is provided with a first positioning sheet and a second positioning sheet which can slide left and right along the backer body; the front end of the first positioning piece is provided with a first positioning tooth; the front end of the second positioning piece is provided with a second positioning tooth; determining the distance between the second positioning tooth and the inner side edge of the widest part of the milling head through the size tenon head of the tenoning caliper gauge; the distance of the outer side edge between the first positioning tooth and the second positioning tooth is determined by the size mortise of the size corresponding to the size tenon.

5. A mortise mechanism according to claim 4, characterised in that: the front surface of the backer body is provided with a sliding chute in the left-right direction; the first positioning piece and the second positioning piece are assembled with the sliding groove through the adjustable sliding block locking piece, and the first positioning piece and the second positioning piece slide left and right along the backer body and are locked and positioned.

6. A mortise mechanism according to claim 5, characterised in that: the cross section of the sliding chute is in a cross shape; the adjustable sliding block locking piece comprises a fastening bolt and a T-shaped sliding block matched with the sliding groove; the stud of the fastening bolt penetrates through the locked piece and then is in threaded connection with the T-shaped sliding block; when the T-shaped sliding block is locked, the fastening bolt is rotated to tighten the T-shaped sliding block, so that the T-shaped sliding block and the sliding groove are locked.

7. A mortise mechanism according to claim 6, characterised in that: the first positioning piece is arranged on the front side of the second positioning piece, and a long hole in the left-right direction is formed in the first positioning piece; a stud of a fastening bolt of one adjustable slide block locking piece penetrates through one end of the second positioning piece to be connected with a corresponding T-shaped slide block in the sliding groove; the other adjustable slide block locking piece penetrates through the long hole of the first positioning piece and the second positioning piece through the stud of the fastening bolt and then is connected with the corresponding T-shaped slide block in the sliding groove; the caliper body is further provided with a half hole or a through hole for avoiding a rotary tool when the fastening bolt is rotated.

8. A mortise mechanism according to claim 4, characterised in that: the first positioning piece and the second positioning piece are both arranged in an L shape, the first positioning piece is placed on the second positioning piece, and the top surface of the vertical end of the first positioning piece is flush with the top surface of the vertical rear end of the second positioning piece; the front surface of the horizontal end of the first positioning sheet is flush with the front surface of the horizontal end of the second positioning sheet; the first positioning teeth are arranged on the front side of the horizontal end of the first positioning sheet; the second positioning teeth are arranged on the front side of the horizontal end of the second positioning piece; the front end of the first positioning tooth is flush with the front end of the second positioning tooth; a backing plate is further fixed on the front side of the backing body; the backup plate is provided with windows in the areas of the first positioning piece and the second positioning piece; the front end surface of the backup plate is positioned at the tooth bodies of the first positioning teeth and the second positioning teeth, so that the backup plate forms a working surface of the backup, and the first positioning teeth and the second positioning teeth are exposed out of the working surface of the backup to realize size positioning; the backup plate can be grooved by the milling head; the backer body is provided with the fluting in the position that corresponds with the cutting region of backup plate and dodges the district.

9. A mortise mechanism according to claim 6, characterised in that: the back of the backer body is also provided with a sliding chute in the left-right direction; an L-shaped fixing piece is arranged on the rear side of the backer body; a sliding strip in the front-back direction is fixed at the horizontal bottom end of the L-shaped fixing piece; the vertical front end of the L-shaped fixing piece is assembled with the sliding groove in the back of the backer body through the adjustable sliding block locking piece, so that the backer body can slide left and right and can be locked and positioned relative to the L-shaped fixing piece.

10. A mortise mechanism according to claim 9, characterised in that: the sliding strip is assembled with a T-shaped track groove embedded in the front and back directions of the workbench; a plurality of clamping rings are fixed on the bottom side of the sliding strip, the clamping rings and the sliding strip form a T-shaped structure to be matched with the T-shaped track groove for use, and the tightness degree of the sliding strip and the T-shaped track groove in the vertical direction is controlled by adjusting the height of the clamping rings relative to the sliding strip; the top side of the sliding strip is also provided with a plurality of tensioning rings, and the tightness degree of the sliding strip and the T-shaped track groove in the left and right directions is controlled by adjusting the tensioning rings; the milling head upwards passes through the workbench and is exposed in front of the backer; the backer is close to or is far away from the milling head forward along T-shaped track groove through the draw runner.