Band sawing machine

Abstract

A band-sawing machine comprises a machine frame, a conveying unit, a sawing unit, a main limiting unit and at least one limiting device. The conveying unit comprises a conveying belt and a support assembly. The saw cutting unit comprises a saw blade capable of rotating around the conveying belt. The main limiting unit comprises two main pressing pieces. The at least one limiting device comprises a plurality of auxiliary limiting units, a driving rod and a pushing unit. Each auxiliary limiting unit is provided with an auxiliary wheel frame and an auxiliary pressing piece, and the driving rod is connected to the auxiliary wheel frame in a pivoted mode. The pushing unit generates first bias force for driving the driving rod, and the driving rod drives the auxiliary wheel carriers, so that each auxiliary wheel carrier generates second bias force for driving the corresponding auxiliary pressing piece to move downwards. The main pressing piece and the auxiliary pressing piece can provide a plurality of pressing and abutting points for the batten, so that the batten is pressed and abutted indeed, and the position of the batten cannot deviate when the batten is cut.

Description

Technical Field

[0001] The present invention relates to a cutting device, in particular to a band saw machine for cutting wood strips. Background Art

[0002] A conventional band saw is used to cut multiple wood strips. The band saw comprises a base, a conveyor belt mounted on the base, a saw blade rotatably surrounding the conveyor belt, and two pressure wheels mounted on the base and located on opposite sides of the saw blade. When the conveyor belt transports the wood strips to the saw blade, the pressure wheels press downward against the wood strips to secure them in place.

[0003] However, due to the wide spacing between the pressure wheels, the position of the shorter wood strips is easily offset when passing through the saw blade, resulting in uneven thickness of the cut wood strips and unstable cutting quality. Summary of the Invention

[0004] The object of the present invention is to provide a band saw machine which ameliorates at least one of the aforementioned disadvantages.

[0005] The band saw machine of the present invention is used for cutting at least one wooden strip, and the band saw machine includes a frame, a conveying unit, a sawing unit, a main limiting unit, and at least one limiting device. The conveying unit includes a conveying seat arranged on the frame, a conveyor belt arranged on the conveying seat, and a bracket assembly arranged on the conveying seat. The conveyor belt and the conveying seat jointly define a conveying space extending along the conveying direction, and the conveying space has a feeding area and a discharging area in sequence along the conveying direction. The sawing unit includes a housing arranged on the frame and defining an installation space, and a saw blade arranged in the installation space and rotatably surrounding the conveyor belt, with a portion of the saw blade located between the feeding area and the discharging area. The main limiting unit includes two main pressure members respectively located in the feeding area and the discharging area and used to elastically press downward against the wooden strip. The at least one limiting device is arranged in one of the feeding area and the discharging area, and the at least one limiting device includes a plurality of auxiliary limiting units arranged at intervals on the bracket assembly along the conveying direction, a driving rod pivotally connected to the auxiliary limiting unit, and a pushing unit arranged between the bracket assembly and the driving rod, each of the auxiliary limiting units has a auxiliary wheel frame pivotally connected to the bracket assembly, and an auxiliary pressure piece arranged on the lower side of the auxiliary wheel frame, the driving rod is pivotally connected to the upper side of the auxiliary wheel frame, the pushing unit generates a first biasing force that drives the driving rod along the conveying direction, and the driving rod drives the auxiliary wheel frame, so that each of the auxiliary wheel frames generates a second biasing force that drives the corresponding auxiliary pressure piece to move downward.

[0006] In the band saw machine described in the present invention, each of the auxiliary wheel frames has a pivotal portion pivotally connected to the bracket assembly, an upper plate portion extending upward from the pivotal portion and toward the conveying direction, and a lower plate portion extending downward from the pivotal portion and toward the conveying direction, each of the upper plate portions is pivotally connected to the drive rod at one end away from the pivotal portion, and each of the lower plate portions is provided with a corresponding auxiliary pressure piece at one end away from the pivotal portion.

[0007] In the band saw machine of the present invention, the pushing unit comprises a moving rod movably disposed on the bracket assembly and pivotally connected to the driving rod, and a compression spring elastically supported between the moving rod and the bracket assembly.

[0008] In the band saw machine described in the present invention, the movable rod extends along the conveying direction, and the movable rod has a pivotal end portion pivotally connected to the end of the driving rod away from the saw blade, a rod body portion extending from the pivotal end portion in a direction away from the saw blade, and a stop portion arranged on the rod body portion and located on the side of the bracket assembly opposite to the compression spring.

[0009] The band saw machine of the present invention comprises two limiting devices respectively arranged at the feeding area and the discharging area.

[0010] The band saw machine described in the present invention, the main limiting unit also includes a feed wheel frame pivotally connected to the bracket assembly and located in the feed area, and a feed shock absorber pivotally connected between the upper end of the feed wheel frame and the bracket assembly, one of the main pressure members is arranged at the lower end of the feed wheel frame, the feed wheel frame extends upward from the feed area and in a direction away from the saw blade, the pivotal connection between the feed wheel frame and the feed shock absorber is higher than the pivotal connection between the feed wheel frame and the bracket assembly, the pivotal connection between the feed shock absorber and the bracket assembly is farther away from the saw blade than the pivotal connection between the feed wheel frame and the bracket assembly, the feed shock absorber has a retractable damping rod, and a retractable shock-absorbing elastic member that bounces against the feed wheel frame.

[0011] The band saw machine described in the present invention, the main limiting unit also includes a discharging wheel frame whose upper end is pivotally connected to the bracket assembly and located in the discharging area, and a discharging shock absorber pivotally connected between the discharging wheel frame and the bracket assembly, one of the main pressure members is arranged at the lower end of the discharging wheel frame, the discharging wheel frame extends upward from the discharging area and toward the direction adjacent to the saw blade, the pivotal connection between the discharging shock absorber and the bracket assembly is farther away from the saw blade than the pivotal connection between the discharging wheel frame and the bracket assembly, the pivotal connection between the discharging shock absorber and the discharging wheel frame is lower than the pivotal connection between the discharging wheel frame and the bracket assembly, the discharging shock absorber has a retractable damping rod, and a retractable shock-absorbing elastic member that bounces against the discharging wheel frame.

[0012] The band saw machine described in the present invention has a first side wall and a second side wall located on two opposite sides of the conveying space along a lateral direction perpendicular to the conveying direction, and the second side wall has a side opening connected to the feeding area. The band saw machine also includes a side limiting unit, and the side limiting unit includes a pivot seat, a V-shaped plate, a baffle, a tension spring, and a side pressure wheel. The pivot seat is arranged on the second side wall, and the V-shaped plate has a first end adjacent to the feeding area, a second end farther away from the feeding area than the first end, and a side pressure wheel located at the bending part of the V-shaped plate and moving up and down. The extended axis is the connecting end portion pivotally connected to the pivot seat, and the connecting end portion is farther away from the saw blade than the first end portion and the second end portion. The baffle is arranged on the V-shaped plate and is located between the first end portion and the connecting end portion. The baffle is located in the feeding area and can be movably pressed against the second side wall. The tension spring is arranged between the second end portion and the second side wall. The side pressure wheel is arranged at the first end portion and adjacent to the side opening. The tension spring drives the V-shaped plate to generate a biasing force that constantly causes the side pressure wheel to move toward the feeding area.

[0013] The band saw machine described in the present invention, the sawing unit also includes two disc wheels arranged at intervals along the side direction perpendicular to the conveying direction and used to drive the saw blade to rotate, the saw blade surrounds the disc wheels, each of the disc wheels has an axial centerline extending along the conveying direction, and the distance between the axial centerlines is slightly larger than the outer diameter of each of the disc wheels.

[0014] The band saw machine described in the present invention further includes a chip removal unit, which includes a dust collection hood and an exhaust duct connected to the dust collection hood, the dust collection hood has four guide plates and four side plates staggered with the guide plates, the guide plates and the side plates define a dust collection channel, the dust collection channel has an air inlet and an air outlet, and the dust collection channel gradually shrinks from the air inlet to the air outlet, each of the side plates is roughly triangular and has a bottom edge portion adjacent to the air inlet, and a top edge portion adjacent to the air outlet and with a width smaller than the bottom edge portion, each of the guide plates has a wide side adjacent to the air outlet, and a narrow side adjacent to the air inlet and with a width smaller than the wide side, each of the wide sides and each of the narrow sides are roughly arc-shaped, the bottom edge portion and the narrow side jointly define the air inlet, the wide side and the top edge portion jointly define the air outlet, and the outline of the air outlet is roughly circular.

[0015] The beneficial effect of the present invention is that: through the main pressure member and the auxiliary pressure member, multiple pressure points can be provided for the at least one wooden strip. When the length of the at least one wooden strip is short, the auxiliary pressure member cooperates with the main pressure member to accurately press the at least one wooden strip and maintain its position during cutting without deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional combined diagram of an embodiment of a band saw machine of the present invention;

[0017] Figure 2 yes Figure 1 A partial enlarged view showing one of the limiting devices of the embodiment;

[0018] Figure 3 yes Figure 1 A partial enlarged view showing another limiting device of the embodiment;

[0019] Figure 4 is a cross-sectional view of the sawing unit of the embodiment;

[0020] Figure 5 is a top view of the side limiting unit of the embodiment;

[0021] Figure 6 is a perspective view of a dust collecting cover of a chip removal unit of the embodiment;

[0022] Figure 7 is a cross-sectional view of a dust collecting cover of a chip removal unit of the embodiment;

[0023] Figure 8 It is along Figure 7 A sectional view taken along line VIII-VIII;

[0024] Figure 9 is a fragmentary cross-sectional view of the embodiment;

[0025] Figure 10 is similar Figure 5 A view showing that a side pressure wheel of the side limiting unit presses against the wooden strip. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0027] See Figure 1 , an embodiment of the band saw machine of the present invention comprises a frame 1 (see Figure 4 ), a conveying unit 2, a sawing unit 3, two limiting devices 4, a main limiting unit 5, a side limiting unit 6, and a chip removal unit 7.

[0028] See Figure 1 ,and Figure 2The conveying unit 2 includes a conveying seat 21 arranged on the frame 1, a conveyor belt 22 arranged on the conveying seat 21, and a bracket assembly 23. The conveying seat 21 has a first side wall 211 and a second side wall 212 arranged at intervals along a lateral direction D. The first side wall 211, the second side wall 212 and the conveyor belt 22 jointly define a conveying space 24. The conveying space 24, the first side wall 211 and the second side wall 212 extend along a conveying direction X perpendicular to the lateral direction D. The conveying space 24 has a feeding area 241 and a discharging area 242 in sequence along the conveying direction X. The second side wall 212 has a side opening 213 connected to the feeding area 241.

[0029] See Figure 2 ,and Figure 3 The support assembly 23 includes a first outer support 231, three first intermediate supports 232, a first inner support 233, a second inner support 234, two second intermediate supports 235, and a second outer support 236, which are arranged on the first side wall 211 in sequence along the conveying direction X.

[0030] The first outer bracket 231 , the first middle bracket 232 , and the first inner bracket 233 are adjacent to the infeed area 241 and are located on one side of the sawing unit 3 along the conveying direction X. The second outer bracket 236 and the second middle bracket 235 are adjacent to the outfeed area 242 and are located on the other side of the sawing unit 3 along the conveying direction X.

[0031] See Figure 1 、 Figure 2 ,and Figure 4 The sawing unit 3 includes a housing 31 arranged on the frame 1 and defining an installation space 311, two disc wheels 32 arranged at intervals along the side direction D, and a saw blade 33 arranged in the installation space 311 and surrounding the disc wheel 32.

[0032] Each of the disc wheels 32 has an axis 321 extending along the conveying direction X. The distance between the axis 321 is slightly greater than the outer diameter of each disc wheel 32. In other words, the disc wheels 32 are adjacent to each other. The saw blade 33 is located between the infeed area 241 and the outfeed area 242. The disc wheels 32 can drive the saw blade 33 to rotate around the conveyor belt 22.

[0033] See Figure 2 ,and Figure 3 The limiting devices 4 are respectively arranged in the feeding area 241 and the discharging area 242.

[0034] Each of the limiting devices 4 has three auxiliary limiting units 41 respectively arranged on the bracket assembly 23 along the conveying direction X, a driving rod 42 pivotally connected to the auxiliary limiting unit 41, and a pushing unit 43 arranged between the bracket assembly 23 and the driving rod 42.

[0035] See Figure 2 , the structure of the limiting device 4 located in the feeding area 241 is first described below.

[0036] The auxiliary limiting units 41 of the limiting device 4 are spaced apart from each other. Each of the auxiliary limiting units 41 has a secondary wheel frame 411 pivotally connected to the corresponding first intermediate bracket 232, and a secondary pressure piece 412 arranged on the lower side of the secondary wheel frame 411. Each of the secondary wheel frames 411 is roughly V-shaped. Each of the secondary wheel frames 411 has a pivoting portion 413 pivotally connected to the corresponding first intermediate bracket 232, an upper plate portion 414 extending upward from the pivoting portion 413 and toward the conveying direction X, and a lower plate portion 415 extending downward from the pivoting portion 413 and toward the conveying direction X. One end of each of the lower plate portions 415 away from the corresponding pivoting portion 413 is provided for the corresponding auxiliary pressure piece 412 to be set. In this embodiment, the auxiliary pressure piece 412 is a roller. In other variations of this embodiment, the auxiliary pressure piece 412 may also be other types of pressure pieces, and is not limited thereto.

[0037] The driving rod 42 is pivotally connected to the upper side of the secondary wheel frame 411. One end of each upper plate portion 414 away from the corresponding pivoting portion 413 is pivotally connected to the driving rod 42.

[0038] The pushing unit 43 includes a moving rod 431 movably mounted on the first outer bracket 231 and pivotally connected to the driving rod 42, and a compression spring 432 that is elastically supported between the moving rod 431 and the first outer bracket 231. The moving rod 431 extends along the conveying direction X. The moving rod 431 includes a pivotal end 433 pivotally connected to an end of the driving rod 42 away from the saw blade 33, a shaft 434 extending from the pivotal end 433 in a direction away from the saw blade 33, and a stopper 435 disposed on the shaft 434 and located on a side of the first outer bracket 231 opposite the compression spring 432. The compression spring 432 is elastically supported between the pivotal end 433 and the first outer bracket 231.

[0039] The compression spring 432 generates a first biasing force that drives the drive rod 42 along the conveying direction X, causing the drive rod 42 to rotate the secondary wheel frame 411, causing each secondary wheel frame 411 to generate a second biasing force that drives its corresponding secondary pressure member 412 to move downward. In this embodiment, the rod body 434 has an external thread, and the stopper 435 is a nut that is screwed onto the rod body 434. By rotating the stopper 435, the distance between the pivot end 433 and the first outer bracket 231 can be changed to adjust the force of the compression spring 432 against the moving rod 431. In this embodiment, the pushing unit 43 uses a coil spring to generate elastic force. In other variations of this embodiment, the pushing unit 43 can also use other types of devices such as cylinders and magnetic springs to generate elastic force, but the present invention is not limited to this.

[0040] See Figure 2 ,and Figure 3 Compared with the limiting device 4 located in the feeding area 241 , the structural differences of the limiting device 4 located in the discharging area 242 will be described below.

[0041] See Figure 3 The pivoting portion 413 of the secondary wheel frame 411 is pivotally connected to the second inner bracket 234 and the second middle bracket 235 respectively.

[0042] The movable rod 431 is movably mounted on the second outer bracket 236. One end of the compression spring 432 springs against the second outer bracket 236, while the other end springs against the end of the movable rod 431 opposite the pivot end 433. The stopper 435 is located on the side of the second outer bracket 236 opposite the compression spring 432. By rotating the stopper 435, the distance between the pivot end 433 and the second outer bracket 236 can be changed.

[0043] See Figure 2 ,and Figure 3 , the main limiting unit 5 is located between the limiting devices 4. The main limiting unit 5 includes an infeed wheel frame 51, an infeed shock absorber 52, a discharging wheel frame 53, a discharging shock absorber 54, and two main pressure members 55 respectively provided at the lower ends of the infeed wheel frame 51 and the discharging wheel frame 53. In this embodiment, the main pressure members 55 are rollers. In other variations of this embodiment, the main pressure members 55 can also be other types of pressure members, and the present invention is not limited to this.

[0044] See Figure 2 The feed wheel frame 51 extends upward from the feed area 241 and away from the saw blade 33 . The middle portion of the feed wheel frame 51 is pivotally connected to the first inner bracket 233 .

[0045] The feed shock absorber 52 is pivotally connected between the upper end of the feed wheel frame 51 and the first intermediate bracket 232 adjacent to the saw blade 33 .

[0046] The pivotal connection between the feed wheel frame 51 and the feed shock absorber 52 is higher than the pivotal connection between the feed wheel frame 51 and the first inner bracket 233. The pivotal connection between the feed shock absorber 52 and the first intermediate bracket 232 adjacent to the saw blade 33 is further away from the saw blade 33 than the pivotal connection between the feed wheel frame 51 and the first inner bracket 233. The feed shock absorber 52 includes a retractable damping rod 521 and a retractable shock-absorbing elastic member 522 that springs against the feed wheel frame 51.

[0047] When the main pressure member 55 located on the feed wheel frame 51 is forced to move upward, the upper end of the feed wheel frame 51 compresses the shock-absorbing elastic member 522 and the damping rod 521 of the feed shock absorber 52. The shock-absorbing elastic member 522 of the feed shock absorber 52 generates a biasing force that pushes the upper end of the feed wheel frame 51, causing the corresponding main pressure member 55 to move downward.

[0048] See Figure 3 The upper end of the discharging wheel frame 53 is pivotally connected to the second inner bracket 234. The discharging wheel frame 53 extends upward from the discharging area 242 and toward the direction adjacent to the saw blade 33.

[0049] The discharge shock absorber 54 is pivotally connected between the discharge wheel frame 53 and the second inner bracket 234. The pivotal connection between the discharge shock absorber 54 and the second inner bracket 234 is farther from the saw blade 33 than the pivotal connection between the discharge wheel frame 53 and the second inner bracket 234. The pivotal connection between the discharge wheel frame 53 and the discharge shock absorber 54 is lower than the pivotal connection between the discharge wheel frame 53 and the second inner bracket 234. The discharge shock absorber 54 has a retractable damping rod 541 and a retractable shock-absorbing elastic member 542 that is elastically supported against the discharge wheel frame 53.

[0050] When the main pressure member 55 located on the discharging wheel frame 53 is forced to move upward, the middle portion of the discharging wheel frame 53 compresses the shock-absorbing elastic member 542 and the damping rod 541 of the discharging shock absorber 54. The shock-absorbing elastic member 542 of the discharging shock absorber 54 generates a biasing force that pushes the middle portion of the discharging wheel frame 53, causing the corresponding main pressure member 55 to move downward.

[0051] See Figure 2 、 5 ,and Figure 10The side limiting unit 6 includes a pivot seat 61, a V-shaped plate 62, a baffle 63, a tension spring 64, and a side pressure wheel 65.

[0052] The pivot seat 61 is disposed on the second sidewall 212 and is farther from the saw blade 33 than the side opening 213 .

[0053] The V-shaped plate 62 has a first end 621 adjacent to the feed area 241, a second end 622 farther from the feed area 241 than the first end 621, and a connecting end 623 located at a bend of the V-shaped plate 62 and pivotally connected to the pivot base 61 about an axis extending vertically (not shown). The connecting end 623 is farther from the saw blade 33 than the first end 621 and the second end 622.

[0054] The baffle 63 is disposed on the V-shaped plate 62 and is located between the first end 621 and the connecting end 623. The baffle 63 is located in the feeding area 241 and is movably pressed against the second side wall 212.

[0055] The tension spring 64 is disposed between the second end portion 622 and the second side wall 212. The side pressure wheel 65 is disposed at the first end portion 621 and adjacent to the side opening 213. The tension spring 64 drives the V-shaped plate 62 to generate a biasing force that constantly forces the side pressure wheel 65 to move toward the feeding area 241.

[0056] See Figure 1 ,and Figure 6 The chip removal unit 7 includes a dust collecting hood 71 disposed on the frame 1 and defining a dust collecting channel 711, an exhaust pipe 72 connected to the dust collecting hood 71, and an exhaust fan (not shown) connected to the exhaust pipe 72.

[0057] See Figures 6 to 8 The dust collecting cover 71 has four guide plates 712 and four side plates 713 connected to the guide plates 712 in an alternating manner.

[0058] The side panels 713 and the guide plates 712 jointly define the dust collection channel 711. The dust collection channel 711 has an air inlet 714 and an air outlet 715. The dust collection channel 711 tapers from the air inlet 714 toward the air outlet 715. Each of the guide plates 712 is generally arc-shaped. Each of the guide plates 712 has a wide side 716 adjacent to the air outlet 715, and a narrow side 717 adjacent to the air inlet 714 and having a width smaller than the wide side 716. Each of the wide sides 716 and each of the narrow sides 717 is generally arc-shaped. Each of the side panels 713 is generally triangular in shape and has a base portion 718 adjacent to the air inlet 714, and a top portion 719 adjacent to the air outlet 715 and having a width smaller than the base portion 718. The base portion 718 and the narrow sides 717 jointly define the air inlet 714. The wide side 716 and the top portion 719 together define the air outlet 715 , and the outline of the air outlet 715 is generally circular.

[0059] See also Figure 9 ,and Figure 10 The band saw machine of the present invention is suitable for cutting one wood strip 8 or multiple wood strips 8.

[0060] When the wooden strips 8 are driven by the conveyor belt 22 and move toward the saw blade 33, the side pressure wheels 65 are pushed by the wooden strips 8 and move toward the side opening 213. The tension spring 64 extends, and the elastic force of the tension spring 64 drives the side pressure wheels 65 to press against the wooden strips 8, so that the wooden strips 8 are neatly arranged along the lateral direction D. When the width of the wooden strips 8 is large, the baffle 63 can abut against the second side wall 212 to prevent the side pressure wheels 65 from moving further outward.

[0061] For ease of description, the following description will continue with the state where one of the wooden strips 8 enters the band saw machine.

[0062] See Figure 2 ,and Figure 9 When the wooden strip 8 contacts the auxiliary pressure member 412, the compression spring 432 of the pushing unit 43 located in the feeding area 241 generates a biasing force applied to the corresponding moving rod 431 along the conveying direction X. The biasing force sequentially drives the moving rod 431, the corresponding driving rod 42, and the corresponding auxiliary wheel frame 411, causing the corresponding auxiliary pressure member 412 to press downward against the wooden strip 8. After passing through the auxiliary pressure member 412, the wooden strip 8 is then pressed against the main pressure member 55 located on the feeding wheel frame 51.

[0063] See Figure 3 ,and Figure 9When the wood strip 8 is cut by the saw blade 33 and enters the discharge area 242, the main pressure member 55 located on the discharge wheel frame 53 presses downward against the wood strip 8. The compression spring 432 of the pushing unit 43 located in the discharge area 242 generates a biasing force applied to the corresponding moving rod 431 along the conveying direction X. The biasing force sequentially drives the moving rod 431, the corresponding driving rod 42, and the corresponding auxiliary wheel frame 411, causing the corresponding auxiliary pressure member 412 to press downward against the wood strip 8.

[0064] The advantages of the present invention are described as follows.

[0065] 1. The main pressing member 55 and the auxiliary pressing member 412 can provide the wood strip 8 with multiple pressing points. When the length of the wood strip 8 is short, the auxiliary pressing member 412 cooperates with the main pressing member 55 to firmly press the wood strip 8 and maintain its position during cutting without deviation.

[0066] 2. The damping rod 521 of the infeed shock absorber 52 and the damping rod 541 of the outfeed shock absorber 54 can reduce the impact and vibration generated when the main pressure member 55 is subjected to force during the cutting process, so that the main pressure member 55 can press against the wood strip 8 more stably.

[0067] 3. The disc wheels 32 of the sawing unit 3 are adjacent to each other, which reduces the length of the saw blade 33 extending along the lateral direction D, thereby reducing the shaking generated when the saw blade 33 rotates, further improving the rotation stability of the saw blade 33 and the sawing quality.

[0068] Fourth, the guide plate 712 of the dust collecting hood 71 can make the airflow through the dust collecting hood 71 smoother, thereby improving the dust collecting effect.

[0069] 5. The side limiting unit 6 can make the wood strips 8 entering the machine aligned along the side direction D, so that the positions of the wood strips 8 entering the machine can be aligned with the auxiliary pressure piece 412 and the main pressure piece 55.

[0070] The above descriptions are merely embodiments of the present invention and should not be used to limit the scope of the present invention. Any simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A band saw for cutting at least one wood strip; characterized in that: The band saw machine comprises: frame; A conveying unit, comprising a conveying seat disposed on the frame, a conveying belt disposed on the conveying seat, and a bracket assembly disposed on the conveying seat, wherein the conveying belt and the conveying seat jointly define a conveying space extending along a conveying direction, wherein the conveying space has a feeding area and a discharging area in sequence along the conveying direction; a sawing unit comprising a housing disposed on the frame and defining an installation space, and a saw blade disposed in the installation space and rotatably surrounding the conveyor belt, wherein a portion of the saw blade is located between the feed area and the discharge area; A main limiting unit, comprising two main pressing members respectively located in the feeding area and the discharging area and used for elastically pressing downward against the wood strips; and At least one limiting device is arranged in one of the feeding area and the discharging area, and the at least one limiting device includes a plurality of auxiliary limiting units arranged at intervals on the bracket assembly along the conveying direction, a driving rod pivotally connected to the auxiliary limiting unit, and a pushing unit arranged between the bracket assembly and the driving rod, each of the auxiliary limiting units has a auxiliary wheel frame pivotally connected to the bracket assembly, and an auxiliary pressure piece arranged on the lower side of the auxiliary wheel frame, the driving rod is pivotally connected to the upper side of the auxiliary wheel frame, the pushing unit generates a first biasing force that drives the driving rod along the conveying direction, and the driving rod drives the auxiliary wheel frame, so that each of the auxiliary wheel frames generates a second biasing force that drives the corresponding auxiliary pressure piece to move downward.

2. The band saw machine according to claim 1, wherein: Each of the auxiliary wheel frames has a pivotal portion pivotally connected to the bracket assembly, an upper plate portion extending upward from the pivotal portion and toward the conveying direction, and a lower plate portion extending downward from the pivotal portion and toward the conveying direction. One end of each of the upper plate portions away from the pivotal portion is pivotally connected to the drive rod, and one end of each of the lower plate portions away from the pivotal portion is provided for the respective corresponding auxiliary pressure members to be set.

3. The band saw machine according to claim 1, wherein: The pushing unit comprises a moving rod which is movably arranged on the bracket assembly and pivotally connected to the driving rod, and a compression spring which is elastically supported between the moving rod and the bracket assembly.

4. The band saw machine according to claim 3, characterized in that: The movable rod extends along the conveying direction, and has a pivotal end pivotally connected to an end of the driving rod away from the saw blade, a rod body extending from the pivotal end in a direction away from the saw blade, and a stop portion arranged on the rod body and located on the side of the bracket assembly opposite to the compression spring.

5. The band saw machine according to claim 1, wherein: The band saw machine includes two limiting devices respectively arranged at the feeding area and the discharging area.

6. The band saw machine according to claim 1, wherein: The main limiting unit also includes a feed wheel frame pivotally connected to the bracket assembly and located in the feed area, and a feed shock absorber pivotally connected between the upper end of the feed wheel frame and the bracket assembly, one of the main pressure members is arranged at the lower end of the feed wheel frame, the feed wheel frame extends upward from the feed area and in a direction away from the saw blade, the pivotal connection between the feed wheel frame and the feed shock absorber is higher than the pivotal connection between the feed wheel frame and the bracket assembly, the pivotal connection between the feed shock absorber and the bracket assembly is farther away from the saw blade than the pivotal connection between the feed wheel frame and the bracket assembly, the feed shock absorber has a retractable damping rod, and a retractable shock-absorbing elastic member that bounces against the feed wheel frame.

7. The band saw machine according to claim 1, wherein: The main limiting unit also includes a discharging wheel frame whose upper end is pivotally connected to the bracket assembly and located in the discharging area, and a discharging shock absorber pivotally connected between the discharging wheel frame and the bracket assembly, one of the main pressure members is arranged at the lower end of the discharging wheel frame, the discharging wheel frame extends upward from the discharging area and toward the direction adjacent to the saw blade, the pivotal connection between the discharging shock absorber and the bracket assembly is farther away from the saw blade than the pivotal connection between the discharging wheel frame and the bracket assembly, the pivotal connection between the discharging shock absorber and the discharging wheel frame is lower than the pivotal connection between the discharging wheel frame and the bracket assembly, the discharging shock absorber has a retractable damping rod, and a retractable shock-absorbing elastic member that bounces against the discharging wheel frame.

8. The band saw machine according to claim 1, wherein: The conveying seat has a first side wall and a second side wall located on opposite sides of the conveying space along a lateral direction perpendicular to the conveying direction, the second side wall having a side opening connected to the feeding area, and the band saw machine further includes a side limiting unit, the side limiting unit including a pivot seat, a V-shaped plate, a baffle, a tension spring, and a side pressure wheel, the pivot seat being arranged on the second side wall, the V-shaped plate having a first end adjacent to the feeding area and a second end farther from the feeding area than the first end, and a connecting end located at a bend of the V-shaped plate and pivotally connected to the pivot seat about an axis extending vertically, the connecting end being farther from the saw blade than the first end and the second end, the baffle being arranged on the V-shaped plate and between the first end and the connecting end, the baffle being located in the feeding area and movably leaning against the second side wall, the tension spring being arranged between the second end and the second side wall, the side pressure wheel being arranged at the first end and adjacent to the side opening, the tension spring driving the V-shaped plate to generate a biasing force that constantly forces the side pressure wheel to move toward the feeding area.

9. The band saw machine according to claim 1, wherein: The sawing unit also includes two disc wheels spaced apart along a lateral direction perpendicular to the conveying direction and used to drive the saw blade to rotate. The saw blade surrounds the disc wheels, and each of the disc wheels has an axial centerline extending along the conveying direction. The distance between the axial centerlines is slightly larger than the outer diameter of each of the disc wheels.

10. The band saw machine according to claim 1, wherein: The hood has four guide plates and four side plates staggered with the guide plates, the guide plates and the side plates defining a dust collection channel, the dust collection channel having an air inlet and an air outlet, the dust collection channel gradually narrowing from the air inlet to the air outlet, each of the side plates being roughly triangular in shape and having a bottom edge portion adjacent to the air inlet and a top edge portion adjacent to the air outlet and having a width smaller than the bottom edge portion, each of the guide plates being roughly arc-shaped, each of the guide plates having a wide side adjacent to the air outlet and a narrow side adjacent to the air inlet and having a width smaller than the wide side, each of the wide sides and each of the narrow sides being roughly arc-shaped, the bottom edge portion and the narrow side jointly defining the air inlet, the wide side and the top edge portion jointly defining the air outlet, and the outline of the air outlet being roughly circular.

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