Optimized bench saw blade parallelism adjusting mechanism

Abstract

The invention belongs to the technical field of bench saws, and discloses an optimized bench saw blade parallelism adjusting mechanism which comprises a hanging bracket body, a power head assembly and a hinge assembly. In the adjusting process and after adjustment, no adverse effect is caused on the whole mounting structure, the whole mechanism is in a relatively stable state in the adjusting process, the power head assembly only has a unique degree of freedom in the adjusting direction, and the adjusting process does not generate changes in other directions; fine adjustment can be carried out through feeding of the threads; the previous adjusting position cannot be influenced in the fixing process; compared with the prior art, the hinge rotating shaft reduces and eliminates the fit clearance to the maximum extent through a hinge mode and the interaction of the two rotary knobs, the movable guide rod and the power head assembly achieve matching of a round hole and a round shaft, the fit precision is guaranteed, and meanwhile extra abrasion and deformation caused by long-term use can be avoided; and meanwhile, an adjusting function is realized on the basis of a three-rod structure.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bench saws, and particularly relates to an optimized parallelism adjusting mechanism of a bench saw blade. BACKGROUND

[0002] A traditional bench saw mainly comprises a fence, an angle disc, a workbench assembly, a frame assembly and a hanger assembly. A saw blade is installed on the hanger assembly, the hanger assembly is rotatably suspended below the workbench, and the fence and the angle disc are used to complete the cutting and beveling of wood. The hanger assembly can be further divided into two parts, including a hanger body and a power head assembly installed on the hanger body. The power head assembly is movably installed on the hanger body, the saw blade is installed on the power head assembly and moves up and down with the power head assembly. The power head assembly is guided by the guide rods vertically arranged on both sides of the power head assembly during the lifting process, so as to ensure that the angle of the saw blade remains basically unchanged during the lifting process. Before use, the bench saw needs to be adjusted to ensure the parallelism between the saw blade and the guide groove of the workbench and the fence. The most original and common adjustment method is to adjust the direction of the saw blade by moving the horizontal position of one of the suspension brackets at both ends of the hanger assembly. However, the conventional adjustment method has some defects: (1) moving one of the suspension brackets may cause the rotation centers at both ends to be misaligned, resulting in an angle between the center lines of the shaft and the hole, and then causing friction or even interference during rotation, affecting the smoothness of the machine; (2) when adjusting, tools are needed to loosen and fix the screws of the suspension bracket, and suitable tools need to be found during use, which is difficult to operate; (3) when loosening the screws, the hanger assembly is in a loose state (has degrees of freedom in all directions), and without the guidance of a tooling jig, the adjustment is very difficult, it is difficult to quickly and stably fix the direction of the saw blade at a reasonable position, and the efficiency is very low; (4) non-professionals may cause the precision of the machine to decrease after adjustment; and (5) even if the saw blade has been adjusted to the required direction, the user may still cause the angle to deviate during the screw tightening process.

[0003] According to the search, the parallelism adjusting device of the table tool cutting piece disclosed in the patent with the publication number CN210999132U is proposed by adjusting the relative position of the power head assembly with respect to the hanger body to adjust the position of the saw blade. The wear-resistant sleeve in the patent can be adjusted transversely with respect to the power head assembly. By adjusting the position of the wear-resistant sleeve with respect to the power head assembly, the direction of the saw blade is changed / fine-tuned. However, the patent still has some defects: 1. The cooperation between the wear-resistant sleeve and the guide rod and the cooperation between the wear-resistant sleeve and the adjusting screw are both movable gap cooperation. If the waist-shaped hole and the sliding groove on the wear-resistant sleeve are machined, the cost is relatively high. Therefore, they are usually molded by a mold. However, the problem is that the tolerance is large. The clamping groove on the adjusting screw for connection is turned and processed. The processing method determines that the size tolerance range is large. The guide rod and the waist-shaped groove are in line contact, not in surface contact. During mutual movement, they are more likely to wear or deform after extrusion. The cumulative gap caused by the above reasons will make the entire power head move during work, which affects the precision. 2. The patent adopts a two-rod structure under the premise of sacrificing performance, that is, taking one rod as the center of rotation and adjusting the position of the other rod with respect to the power head assembly. By simplifying the structure, the purpose of adjusting the power head assembly is achieved. The defect of the two-rod structure is low precision. It is a low-price simplified scheme. Therefore, a table saw blade parallelism adjusting mechanism that can improve the operability of the adjusting mechanism, efficiently and accurately fine-tune the angle, and ensure the precision of the machine after adjustment is needed. SUMMARY

[0004] The purpose of the present application is to provide an optimized table saw blade parallelism adjusting mechanism to solve the problems raised in the background art.

[0005] In order to achieve the above-mentioned purpose, the present application provides the following technical scheme: an optimized table saw blade parallelism adjusting mechanism, comprising a hanger body, a power head assembly and a hinge assembly, the power head assembly is arranged on the front side of the hanger body, the hinge assembly is arranged on the front end of the hanger body and located on the left side of the power head assembly, The power head assembly comprises a power motor, a gear box and a saw blade, the hinge assembly comprises a movable guide rod, a hinge rotating shaft, a first connecting block, a second connecting block, an adjusting knob, a fixed knob and a spring, a fixed guide rod is fixedly installed on the right side of the front end of the hanger body, the outer surface of the fixed guide rod is movably sleeved with the right end of the gear box, the hinge rotating shaft is movably installed on the left side of the front end of the hanger body, the upper and lower ends of the hinge rotating shaft are fixedly sleeved with the first connecting block and the second connecting block respectively, the right ends of the first connecting block and the second connecting block are fixedly sleeved with the movable guide rod located in the left end of the gear box, the outer surface of the movable guide rod is movably sleeved with a guide sleeve, the outer surface of the guide sleeve is movably sleeved with the inner surface of the left end of the gear box, the adjusting knob and the fixed knob are connected through the second connecting block and the spring is installed below the connecting position of the second connecting block and the fixed knob, and the other end of the spring is fixedly connected with the front end of the hanger body.

[0006] As preferred, a lifting screw rod is movably installed on the right side of the front end of the hanger body, and the outer surface of the lifting screw rod is threadedly sleeved with a threaded sleeve.

[0007] As preferred, the guide sleeve is sleeved in a transverse machining hole opened in the left end of the gear box, and the transverse machining hole is perpendicular to the movable guide rod.

[0008] As preferred, a circular hole perpendicular to the outer shape axis of the guide sleeve is arranged on the guide sleeve, and the circular hole is in small-gap precise fit with the movable guide rod.

[0009] As preferred, the threaded sleeve is located outside the gear box, and the threaded sleeve is provided with a step feature matched with the right end of the gear box and preventing the threaded sleeve from rotating with the lifting screw rod.

[0010] As preferred, the fixed guide rod, the movable guide rod and the hinge rotating shaft are parallel to each other.

[0011] As preferred, the hinge rotating shaft is rotatably fixed on the hanger body, and the hinge rotating shaft adopts an integrated design or a split type design of several concentric shafts.

[0012] As preferred, trunnions are fixedly installed on the top of the left and right ends of the hanger body respectively, and the number of the trunnions is two and the shapes and sizes of the trunnions are the same.

[0013] As preferred, the other end of the output shaft of the power motor is fixedly installed with the gear box, and the other end of the output shaft of the gear box is fixedly installed with the saw blade located behind the hanger body.

[0014] The beneficial effects of the present application are as follows: The adjusting process and the adjustment do not cause adverse effects on the overall installation structure, the whole mechanism is in a relatively stable state during the adjusting process, the power head assembly has only one degree of freedom in the adjusting direction, and no changes in other directions are caused during the adjusting process; fine adjustment can be performed through the feeding of the thread; the fixing process does not affect the previous adjustment position; compared with the prior art, the hinge rotating shaft is reduced and eliminated by the hinge and the interaction of the two knobs, the movable guide rod and the power head assembly realize the round hole and round shaft matching, which can ensure the matching precision and avoid additional wear and deformation caused by long-term use, and the adjusting function is realized on the basis of the three-bar structure, so as to ensure the guiding precision and realize the dual optimization of operation efficiency and cutting precision. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall explosion structure of the present application; Figure 2 It is a schematic diagram of the structure of the front of the present application; Figure 3 It is a schematic diagram of the cross-sectional structure of the front of the present application; Figure 4 It is a schematic diagram of the structure of the guide sleeve of the present application; Figure 5 It is a schematic diagram of the structure of the thread sleeve of the present application.

[0016] In the figure: 1, hanger body; 11, trunnion; 2, power head assembly; 21, power motor; 22, gear box; 23, saw blade; 3, hinge assembly; 31, movable guide rod; 32, hinge rotating shaft; 33, No. 1 connecting block; 34, No. 2 connecting block; 35, adjusting knob; 36, fixing knob; 37, spring; 4, fixed guide rod; 5, thread sleeve; 6, lifting screw; 7, guide sleeve. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0018] As Figures 1 to 5As shown, the embodiment of the present application provides an optimized parallelism adjusting mechanism of table saw blade, which comprises a hanger body 1, a power head assembly 2 and a hinge assembly 3, the power head assembly 2 is arranged at the front side of the hanger body 1, the hinge assembly 3 is arranged at the front end of the hanger body 1 and located at the left side of the power head assembly 2, Wherein, the power head assembly 2 comprises a power motor 21, a gear box 22 and a saw blade 23, the hinge assembly 3 comprises a movable guide rod 31, a hinge rotating shaft 32, a first connecting block 33, a second connecting block 34, an adjusting knob 35, a fixed knob 36 and a spring 37, a fixed guide rod 4 is fixedly installed at the right side of the front end of the hanger body 1, the outer surface of the fixed guide rod 4 and the right end of the gear box 22 are movably sleeved, the hinge rotating shaft 32 is movably installed at the left side of the front end of the hanger body 1, the upper and lower ends of the hinge rotating shaft 32 are fixedly sleeved with the first connecting block 33 and the second connecting block 34 respectively, the right ends of the first connecting block 33 and the second connecting block 34 are fixedly sleeved with the movable guide rod 31 located in the left end of the gear box 22, the outer surface of the movable guide rod 31 movably sleeved with a guide sleeve 7, the outer surface of the guide sleeve 7 and the inner surface of the left end of the gear box 22 movably sleeved, the adjusting knob 35 and the fixed knob 36 are connected with the second connecting block 34 through threads, and the spring 37 is installed below the connection between the second connecting block 34 and the fixed knob 36, the other end of the spring 37 is fixedly connected with the front end of the hanger body 1.

[0019] The fixed guide rod 4 serves as the rotating shaft or rotating fulcrum of the gear box 22 during parallelism adjustment; when the adjusting knob 35 is rotated, the entire hinge assembly 3 can be rotated relative to the hinge rotating shaft 32 while overcoming the force of the spring 37, so as to adjust the distance between the movable guide rod 31 and the hanger body 1; when the movable guide rod 31 reaches the desired position through adjustment, the fixed knob 36 can be tightened, so as to achieve the mutual fixation through the lever mode and the adjusting knob 35, and at the same time, the entire hinge assembly 3 is stably fixed.

[0020] Wherein, the front end of the hanger body 1 movably sleeved with a lifting screw 6, the outer surface of the lifting screw 6 is threaded with a threaded sleeve 5, and the outer surface of the threaded sleeve 5 is movably connected with the outer surface of the right end of the gear box 22.

[0021] The lifting screw 6 passes through the right end of the gear box 22, but the lifting screw 6 and the right end of the gear box 22 are mutually sleeved without contact; when the lifting screw 6 is driven, the threads on the lifting screw 6 will make the threaded sleeve 5 translate upward or downward, so as to make the gear box 22 translate upward or downward through the threaded sleeve 5.

[0022] Wherein, the guide sleeve 7 is sleeved in the transverse machining hole opened in the left end of the gear box 22 and perpendicular to the movable guide rod 31, and the guide sleeve 7 and the transverse machining hole are precisely matched with small clearance.

[0023] Through the design of the transverse processing hole and the guide sleeve 7, the guide sleeve 7 has the freedom of axial and rotational movement along the processing hole, which is used to adjust the center distance between the two guide rods, and can also support and constrain the up and down movement of the gear box 22, which is more conducive to the stability of the structure. In addition, through this design, the parts contact each other through the matching surface instead of linear contact, and the friction surface and the bearing area are large, so that the wear and deformation can be effectively reduced.

[0024] Among them, the guide sleeve 7 is provided with a circular hole perpendicular to the profile axis of the guide sleeve 7, and the circular hole is in precise fit with the small gap of the movable guide rod 31.

[0025] The guide sleeve 7 is preferably made of steel and is processed by external circular grinding. In addition to automatically adjusting the center distance, the hardness of the guide sleeve 7 also matches the hardness of the movable guide rod 31, thereby playing a wear-resistant role.

[0026] Among them, the threaded sleeve 5 is located outside the gear box 22, and the threaded sleeve 5 is provided with a step feature matched with the right end of the gear box 22 to prevent the threaded sleeve 5 from rotating with the lifting screw 6.

[0027] The threaded sleeve 5 abuts against the right end of the gear box 22 at both ends, but is not fixed on the gear box 22. The entire threaded sleeve 5 has a degree of freedom relative to the gear box 22 in the direction perpendicular to the saw blade 23. When adjusting the parallelism, the threaded sleeve 5 is stationary relative to the lifting screw 6, but has a small displacement relative to the gear box 22, and at the same time, the center of the lifting screw 6 is close to the fixed guide rod 4 as the rotating shaft. Therefore, when adjusting the parallelism, the relative displacement between the threaded sleeve 5 and the gear box 22 is smaller.

[0028] Among them, the fixed guide rod 4, the movable guide rod 31 and the hinge rotating shaft 32 are parallel to each other.

[0029] The fixed guide rod 4, the movable guide rod 31 and the hinge rotating shaft 32 together form a three-bar structure. Through the design of the present application, the mutual interference problem of the three-bar structure during adjustment is solved while the structural precision is improved. In addition, when necessary, such as cost consideration, the fixed guide rod 4 and the lifting screw 6 can be combined into one, thereby simplifying the structure into a two-bar structure.

[0030] Among them, the hinge rotating shaft 32 is rotatably fixed on the hanger body 1, and the hinge rotating shaft 32 adopts an integrated design or a split type design of several concentric shafts.

[0031] The hinge rotating shaft 32 and the movable guide rod 31 are parallel to each other, and the two ends are respectively connected to the first connecting block 33 and the second connecting block 34, and the four parts form a reliable fixed connection.

[0032] The top of the hanger body 1 is fixedly installed with an ear shaft 11 at both ends.

[0033] The hanger body 1 is rotatably hung below the table saw workbench through the two ear shafts 11, and the ear shaft 11 is usually a circular arc-shaped boss.

[0034] The other end of the output shaft of the power motor 21 is fixedly installed with a gear box 22, and the other end of the output shaft of the gear box 22 is fixedly installed with a saw blade 23 located at the rear of the hanger body 1.

[0035] Through the cooperation of the power motor 21 and the gear box 22, the saw blade 23 can be rotated.

[0036] Working principle and use process: When adjusting, the operator rotates the adjusting knob 35, so that the No. 2 connecting block 34 rotates the hinge rotating shaft 32, the No. 1 connecting block 33 and the movable guide rod 31 as the hinge rotating shaft 32 as the axis of rotation while overcoming the force of the spring 37, thereby adjusting the relative distance of the movable guide rod 31 and the hanger body 1. At the same time, since the threaded sleeve 5 has one degree of freedom in the direction perpendicular to the saw blade 23 relative to the gear box 22, under the interaction of the movable guide rod 31 and the guide sleeve 7, the gear box 22 will rotate with the power motor 21 and the saw blade 23 as the fixed guide rod 4 as the axis of rotation. When the movable guide rod 31 is adjusted to the required position, the operator tightens the fixed knob 36, thereby realizing relative fixation through the lever mode, and then realizing the stable fixation of the entire hinge assembly 3.

[0037] It should be noted that in this text, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0038] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An optimized parallelism adjustment mechanism for a table saw blade, characterized by, Including has the hanger body (1), the power head subassembly (2) and the hinge subassembly (3), the power head subassembly (2) is set up in the front side of hanger body (1), the hinge subassembly (3) is set up in the front end of hanger body (1) and is located the left side of power head subassembly (2), Wherein, the power head subassembly (2) includes power motor (21), gear box (22) and saw blade (23), the hinge subassembly (3) includes movable guide rod (31), hinge rotation axis (32), No. 1 connecting block (33), No. 2 connecting block (34), adjusting knob (35), fixed knob (36) and spring (37), the right side of the front end of hanger body (1) is fixedly installed with fixed guide rod (4), the outer surface of fixed guide rod (4) and the right end of gear box (22) are movably sleeved, the left side of the front end of hanger body (1) is movably installed with hinge rotation axis (32), the upper and lower ends of hinge rotation axis (32) are fixedly sleeved with No. 1 connecting block (33) and No. 2 connecting block (34) respectively, the right end of No. 1 connecting block (33) and No. 2 connecting block (34) is movably sleeved with movable guide rod (31) in the left end inside of gear box (22), the outer surface of movable guide rod (31) is movably sleeved with guide sleeve (7), the outer surface of guide sleeve (7) and the inner surface of the left end of gear box (22) are movably sleeved, adjusting knob (35) and fixed knob (36) are connected by thread and No. 2 connecting block (34), and spring (37) is installed below the connecting place of No. 2 connecting block (34) and fixed knob (36), the other end of spring (37) is fixedly connected with the front end of hanger body (1).

2. An optimized table saw blade parallelism adjustment mechanism according to claim 1, wherein: The right side of the front end of hanger body (1) is movably installed with lifting screw (6), the outer surface of lifting screw (6) is threadedly sleeved with threaded sleeve (5), and the outer surface of threaded sleeve (5) is movably connected with the outer surface of the right end of gear box (22).

3. An optimized table saw blade parallelism adjustment mechanism according to claim 1, wherein: The guide sleeve (7) is sleeved in the transverse machining hole opened in the left end of the gear box (22), and the transverse machining hole is perpendicular to the movable guide rod (31), and the guide sleeve (7) and the transverse machining hole are precisely matched with a small gap.

4. An optimized table saw blade parallelism adjustment mechanism according to claim 1, wherein: A circular hole perpendicular to the outer shape axis of the guide sleeve (7) is arranged on the guide sleeve (7), and the circular hole and the movable guide rod (31) are precisely matched with a small gap.

5. An optimized table saw blade parallelism adjustment mechanism according to claim 2, wherein: The threaded sleeve (5) is located outside the gear box (22), and the threaded sleeve (5) is provided with a step feature matched with the right end of the gear box (22) to prevent the threaded sleeve (5) from rotating with the lifting screw (6).

6. An optimized table saw blade parallelism adjustment mechanism according to claim 1, wherein: The fixed guide rod (4), the movable guide rod (31) and the hinge rotation axis (32) are parallel to each other.

7. An improved parallelism adjustment mechanism for a table saw blade as defined in claim 1 wherein: The hinge rotation axis (32) is rotatably fixed on the hanger body (1), and the hinge rotation axis (32) adopts an integrated design or a split type design of several concentric shafts.

8. An optimized table saw blade parallelism adjustment mechanism according to claim 1, wherein: The top of the left and right ends of the hanger body (1) is respectively fixedly installed with trunnion (11), and the number of trunnions (11) is two and the shapes and sizes are the same.

9. An optimized table saw blade parallelism adjustment mechanism according to claim 1, wherein: The other end of the output shaft of the power motor (21) is fixedly installed with a gear box (22), and the other end of the output shaft of the gear box (22) is fixedly installed with a saw blade (23) located at the rear of the hanger body (1).

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