Lift mechanism for a jigsaw and jigsaw

Abstract

The embodiment of the present disclosure relates to the technical field of electric tools, and provides a blade lifting mechanism of a jigsaw and the jigsaw, the blade lifting mechanism of the jigsaw comprises: a driving assembly; a first pushing part and a second pushing part, the driving assembly is used for driving the first pushing part and the second pushing part to alternately move at least in a vertical direction; and an abutting assembly, the first pushing part or the second pushing part pushes the abutting assembly to move at least in a horizontal direction. At least the cutting efficiency can be improved while the cutting quality is improved.

Description

Technical Field

[0001] This disclosure relates to the field of power tool technology, and in particular to a lifting mechanism for a jigsaw and the jigsaw itself. Background Technology

[0002] A jigsaw is a reciprocating tool used to cut materials such as wood and plastic, and it is widely used in furniture and decoration industries. When processing a workpiece, the jigsaw's transmission assembly converts the rotational motion of the motor assembly into the reciprocating motion of the reciprocating rod, driving the saw blade to be guided along a defined trajectory curve in order to process the preset workpiece contour.

[0003] Many jigsaws on the market now feature a blade-lifting function. Due to the lifting force that drives the blade to oscillate, a force is applied to the saw blade pointing towards the workpiece, allowing the blade to oscillate slightly in a direction perpendicular to its reciprocating cutting motion, significantly improving cutting efficiency. However, jigsaws using the blade-lifting function experience significant blade-lifting problems. Currently, there is a trade-off between improving efficiency and reducing edge chipping in the use of jigsaws. Summary of the Invention

[0004] This disclosure provides a lifting mechanism for a jigsaw and a jigsaw, which can improve cutting efficiency and cutting quality at the same time.

[0005] According to some embodiments of this disclosure, one aspect of this disclosure provides a lifting mechanism for a jigsaw, including: a driving component; a first pushing part and a second pushing part, the driving component being used to drive the first pushing part and the second pushing part to move alternately at least in the vertical direction; and a stop component, the first pushing part or the second pushing part pushing the stop component to move at least in the horizontal direction.

[0006] In some embodiments, the drive assembly includes a power unit and a transmission unit connected to the power unit, wherein the power unit drives the transmission unit to rotate, and the transmission unit drives the first push unit and the second push unit to move.

[0007] In some embodiments, the transmission unit includes: a central gear, which is driven by the power unit to rotate; and a gear, one side of which is provided with an eccentric protrusion, the rotation axis of which passes through the eccentric protrusion, and the center of the eccentric protrusion is offset from the rotation axis of the gear, wherein the central gear drives the gear to rotate.

[0008] In some embodiments, the first pushing part moves in the opposite direction to the second pushing part in the vertical direction.

[0009] In some embodiments, the first pushing part has a first rotating hole, the eccentric protrusion is located in the first rotating hole, and the gear and the eccentric protrusion drive the first pushing part to rotate around the first fixing pin, and the first pushing part reciprocates at least in the vertical direction; the second pushing part has a second rotating hole, the eccentric protrusion is located in the second rotating hole, and the gear and the eccentric protrusion drive the second pushing part to rotate around the second fixing pin, and the second pushing part reciprocates at least in the vertical direction.

[0010] In some embodiments, the first pushing part and the second pushing part are located between the power part and the gear, the first pushing part has a first through hole, the second pushing part has a second through hole, and the central gear passes through the first through hole and the second through hole.

[0011] In some embodiments, the abutment component includes: a roller frame, one end of which is opposite to the first pusher or the second pusher, and the first pusher or the second pusher pushes the roller frame to rotate around the third fixing pin; and a roller, which is fixed to the other end of the roller frame, and when the roller frame rotates around the third fixing pin, the roller moves at least in the horizontal direction.

[0012] In some embodiments, it further includes a stop pin, the stop pin controlling the position of the top surface of the abutment component to be adjustable in the vertical direction.

[0013] In some embodiments, the device further includes a lifting pin, wherein the first pushing portion and the second pushing portion push the lifting pin to move in a vertical direction, and the lifting pin pushes the abutting component to move at least in a horizontal direction.

[0014] According to some embodiments of this disclosure, another aspect of this disclosure also provides a jigsaw, including: a blade lifting mechanism as described in any of the above embodiments; a jigsaw body, the blade lifting mechanism being located within the jigsaw body; a base for supporting the jigsaw body; and a saw blade mounted on the jigsaw body and protruding beyond the base to cut a workpiece, the saw blade having opposing front and back sides, the front side having serrations, and the abutment component being located on the back side of the saw blade.

[0015] The technical solutions provided in this disclosure have at least the following advantages:

[0016] The lifting mechanism of the jigsaw provided in this embodiment includes: a driving assembly, a first pushing part, a second pushing part, and a stop assembly. The driving assembly drives the first pushing part and the second pushing part to move alternately at least vertically, and the first pushing part or the second pushing part pushes the stop assembly to move at least horizontally. During use, the jigsaw blade reciprocates in two opposite directions. When the blade moves in one direction, it cuts the workpiece; this is the cutting stroke. When the blade moves in the other direction, it does not cut the workpiece; this is the idle stroke. In related technologies, the lifting mechanism of a jigsaw has only one pushing part, which moves alternately at least vertically. Specifically, the pushing part moves upward when the saw blade is in its idle stroke, without pushing the abutment component to move horizontally along the direction close to the workpiece; the pushing part moves downward when the saw blade is in its cutting stroke, pushing the abutment component to move horizontally along the direction close to the workpiece. The horizontal movement of the abutment component can continuously push the saw blade along the direction of cutting the workpiece, thereby completing the lifting action of the jigsaw and improving the cutting efficiency of the jigsaw during the cutting stroke. However, although this lifting mechanism can improve the cutting efficiency of the jigsaw, it will reduce the cutting quality of the jigsaw and cause a relatively serious chipping problem. In the lifting mechanism provided in the embodiments of this disclosure, the first pushing part and the second pushing part move alternately at least vertically, and the lower one of the first pushing part and the second pushing part can push the abutment component to move at least horizontally. Thus, during the reciprocating cutting stroke and idle stroke of the saw blade, either the first pushing part or the second pushing part can push the abutment component downwards, causing the abutment component to move horizontally and push the saw blade to achieve the lifting action. Lifting the blade during the cutting stroke improves the cutting efficiency of the jigsaw, while lifting the blade during the idle stroke reduces edge chipping on the workpiece surface, improving cutting quality. Therefore, it is possible to improve cutting efficiency while reducing edge chipping and improving cutting quality. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the lifting mechanism of a jigsaw;

[0019] Figure 2This is a schematic diagram of the internal structure of a jigsaw;

[0020] Figure 3 A schematic diagram of the lifting mechanism of a jigsaw provided in an embodiment of this disclosure;

[0021] Figure 4 A side view of the lifting mechanism of a jigsaw provided in an embodiment of this disclosure;

[0022] Figure 5 Another side view of the lifting mechanism of a jigsaw provided in an embodiment of this disclosure;

[0023] Figure 6 This is a side view of the lifting mechanism of a jigsaw provided in an embodiment of the present disclosure.

[0024] Figure 7 A top view schematic diagram of the lifting mechanism of a jigsaw provided in an embodiment of the present disclosure;

[0025] Figure 8 Another top view schematic diagram of the lifting mechanism of a jigsaw provided in an embodiment of this disclosure;

[0026] Figure 9 This is a schematic diagram of the structure of a jigsaw provided in an embodiment of the present disclosure;

[0027] Figure 10 A schematic diagram of a side view of a jigsaw provided in an embodiment of this disclosure;

[0028] Figure 11 This is a schematic diagram of another side view of a jigsaw provided in an embodiment of the present disclosure;

[0029] Figure 12 This is a schematic diagram of another side view of a jigsaw provided in an embodiment of the present disclosure;

[0030] Figure 13 This is a schematic diagram of the internal structure of a jigsaw provided in an embodiment of the present disclosure;

[0031] Figure 14 A schematic diagram of the motion trajectory of an internal component of a jigsaw provided in an embodiment of this disclosure;

[0032] Figure 15 This is a schematic diagram of another motion trajectory of an internal component of a jigsaw provided in one embodiment of the present disclosure. Detailed Implementation

[0033] As can be seen from the background technology, the current jigsaw's blade lifting mechanism has the problem of not being able to balance cutting efficiency and cutting quality.

[0034] Figure 1This is a schematic diagram of the lifting mechanism of a jigsaw. Figure 2 This is a schematic diagram of the internal structure of a jigsaw.

[0035] refer to Figures 1 to 2 It should be noted that, since the saw teeth of the jigsaw blade 4 have a directional orientation, the saw blade 4 will reciprocate in the vertical direction when the jigsaw is cutting the workpiece. Figure 2 In a jigsaw, the saw teeth of the saw blade 4 face upwards. When the saw blade 4 moves upwards, it cuts the workpiece; that is, the upward stroke of the saw blade 4 is the cutting stroke of the jigsaw. When the saw blade 4 moves downwards, it does not cut the workpiece; that is, the downward stroke of the saw blade 4 is the idle stroke of the jigsaw. During the cutting stroke, the jigsaw will produce a large number of chipped edges on the cut surface of the workpiece.

[0036] Continue to refer to Figures 1 to 2 In related technologies, the lifting mechanism of a jigsaw includes a drive assembly 1, a pushing part 2, and a stop assembly 3. The drive assembly 1 drives the pushing part 2 to move at least in the vertical direction, and the pushing part 2 pushes the stop assembly 3 to move at least in the horizontal direction. When the saw blade 4 moves upward to cut the workpiece, the drive assembly 1 drives the pusher 2 downward. The pusher 2 pushes the abutment assembly 3 downward in the vertical direction and moves horizontally towards the saw blade 4. The abutment assembly 3 pushes the saw blade 4 closer to the workpiece, realizing the lifting action, which can improve the cutting efficiency of the jigsaw. When the saw blade 4 moves downward for the idle stroke, the drive assembly 1 drives the pusher 2 upward. The pusher 2 does not push the abutment assembly 3 downward. The abutment assembly 3 is subjected to a load force from the workpiece and moves in the direction away from the workpiece. The abutment assembly 3 moves horizontally towards the direction away from the workpiece and moves vertically upward. At this time, the abutment assembly 3 cannot push the saw blade 4 closer to the workpiece, cannot realize the lifting action, and cannot correct the edge breakage caused by the cutting stroke. After the saw blade 4 finishes cutting, there are still a lot of edge breakage on the surface of the workpiece, and the cutting quality is poor.

[0037] Analysis revealed that while the lifting mechanism of the jigsaw, comprising the drive component 1, the pusher 2, and the abutment component 3, can improve the cutting efficiency of the jigsaw, it leaves a large amount of chipping on the cut surface of the workpiece, reducing cutting efficiency. If a lifting mechanism for a jigsaw could be provided that both improves cutting efficiency and prevents chipping on the cut surface of the workpiece, the aforementioned problems could be mitigated.

[0038] This disclosure provides a blade lifting mechanism for a jigsaw, including: a driving assembly, a first pushing part, a second pushing part, and a stop assembly. The driving assembly drives the first and second pushing parts to move alternately at least vertically, and the first and second pushing parts push the stop assembly to move at least horizontally. Thus, blade lifting can be performed during the saw blade's cutting stroke to improve cutting efficiency, and blade lifting can be performed during the saw blade's idle stroke to correct edge chipping on the workpiece. This improves both cutting efficiency and reduces edge chipping, thereby enhancing the cutting quality of the jigsaw.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the various embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been presented in the various embodiments of the present disclosure to enable the reader to better understand the present disclosure. However, the technical solutions claimed in the present disclosure can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0040] Figure 3 This is a three-dimensional structural diagram of the lifting mechanism of a jigsaw according to an embodiment of the present disclosure. Figures 4 to 6 This is a schematic diagram of the test structure of the lifting mechanism of the jigsaw provided in the embodiments of this disclosure along different directions. Figures 7 to 8 The diagram shows the curved structure of the lifting mechanism of the jigsaw provided in the embodiments of this disclosure along different directions.

[0041] refer to Figures 3 to 8 The lifting mechanism of the jigsaw includes: a drive assembly 110; a first pusher 120 and a second pusher 130, wherein the drive assembly 110 is used to drive the first pusher 120 and the second pusher 130 to move alternately at least in the vertical direction; and an abutment assembly 140, wherein the first pusher 120 or the second pusher 130 pushes the abutment assembly 140 to move at least in the horizontal direction.

[0042] It should be noted that the saw teeth of a jigsaw blade have an orientation direction. When a jigsaw cuts a workpiece, the saw blade reciprocates in the vertical direction. In some embodiments, the saw teeth of the saw blade face upwards, and the workpiece is cut when the saw blade moves upwards; that is, the upward stroke of the saw blade is the cutting stroke of the jigsaw. The workpiece is not cut when the saw blade moves downwards; that is, the downward stroke of the saw blade is the idle stroke of the jigsaw.

[0043] In other embodiments, the saw teeth of the saw blade may also face downwards. When the saw blade moves downwards, it cuts the workpiece; this is the cutting stroke of the jigsaw. When the saw blade moves upwards, it does not cut the workpiece; this is the idle stroke of the jigsaw. The following description uses an example where the saw teeth of the jigsaw blade face upwards. If the saw teeth of the jigsaw face downwards, the movement directions of the components in the lifting mechanism of the jigsaw described below can be reversed.

[0044] The lifting mechanism of the jigsaw provided in this embodiment allows the first pushing part 120 and the second pushing part 130 to move alternately in the vertical direction during jigsaw operation. When the saw blade moves upward to cut the workpiece, the lower of the first pushing part 120 and the second pushing part 130 can push the abutment component 140 downward, causing the abutment component 140 to move horizontally and push the saw blade closer to the workpiece to achieve the lifting action. Lifting the blade during the saw blade's cutting stroke improves the cutting efficiency of the jigsaw. When the saw blade moves downward for its idle stroke without cutting the workpiece, the lower of the first pushing part 120 and the second pushing part 130 can still push the abutment component 140 downward, causing the abutment component 140 to move horizontally and push the saw blade closer to the workpiece to achieve the lifting action. Lifting the blade during the saw blade's idle stroke can correct edge chipping on the workpiece's cut surface, thereby reducing edge chipping and improving cutting quality. Therefore, the lifting mechanism of the jigsaw with the first pushing part 120 and the second pushing part 130 provided in this embodiment can improve the cutting efficiency of the jigsaw, reduce edge bursting, and improve the cutting quality of the jigsaw.

[0045] In some embodiments, the drive assembly 110 may include a power unit 210 and a transmission unit 310 connected to the power unit 210. The power unit 210 drives the transmission unit 310 to rotate, and the transmission unit 310 drives the first push unit 120 and the second push unit 130 to move. The power unit 210 provides power to the lifting mechanism of the jigsaw and drives the entire lifting mechanism of the jigsaw to operate. The transmission unit 310 transmits the power provided by the power unit 210 and drives the first push unit 120 and the second push unit 130 to move. In the entire lifting mechanism of the jigsaw, the drive assembly 110 drives the first push unit 120 and the second push unit 130 to move at least in the vertical direction. Specifically, the power unit 210 generates driving power, and the transmission unit 310 transmits the driving power generated by the power unit 210 to drive the first push unit 120 and the second push unit 130 to move.

[0046] In some embodiments, the power unit 210 can be a drive motor. When the power unit 210 is started, the drive motor can rotate, and the rotation of the drive motor can drive the transmission unit 310 to rotate, thereby enabling the transmission unit 310 to drive the first push unit 120 and the second push unit 130 to move.

[0047] In some embodiments, the transmission unit 310 may include: a central gear 311, which is driven to rotate by the power unit 210. The central gear 311 may be connected to the power unit 210, and the rotation of the power unit 210 may directly drive the central gear 311 to rotate synchronously with the power unit 210. A gear 312 may also be included, with an eccentric protrusion 3121 on one side. The rotation axis of the gear 312 passes through the eccentric protrusion 3121, and the center of the eccentric protrusion 3121 is offset from the rotation axis of the gear 312. The central gear 311 drives the gear 312 to rotate. The gear 312 may mesh with the central gear 311. When the power unit 210 drives the central gear 311 to rotate, the central gear 311 can drive the gear 312 to rotate around its rotation axis, which passes through the center of the gear 312. The eccentric protrusion 3121 located on one side of the gear 312 can rotate together with the gear 312. The rotation axis of the eccentric protrusion 3121 is the same as the rotation axis of the gear 312, but the center of the eccentric protrusion 3121 is different from the rotation axis.

[0048] In some embodiments, the eccentric protrusion 3121 and the gear 312 can be an integrally formed structure.

[0049] In some embodiments, the side of the gear 312 with the eccentric protrusion 3121 may face the power unit 210, that is, the eccentric protrusion 3121 may be located between the gear 312 and the power unit 210. In other embodiments, the side of the gear 312 with the eccentric protrusion 3121 may face away from the power unit 210, that is, the gear 312 may be located between the eccentric protrusion 3121 and the power unit 210.

[0050] In some embodiments, both the central gear 311 and the gear 312 can be helical gears. That is, the extension direction of the teeth of the central gear 311 can form an acute angle with the rotation axis of the central gear 311, and the extension direction of the teeth of the gear 312 can form an acute angle with the rotation axis of the gear 312. In this way, the transmission accuracy between the central gear 311 and the gear 312 can be improved, resulting in smoother transmission and reduced noise.

[0051] In some embodiments, the movement directions of the first pushing part 120 and the second pushing part 130 in the vertical direction can be opposite. That is, in the vertical direction, when the first pushing part 120 rises, the second pushing part 130 can fall; when the first pushing part 120 falls, the second pushing part 130 can rise. Except when the first pushing part 120 and the second pushing part 130 are in the same position in the vertical direction, one pushing part is always above and the other pushing part is always below. The pushing part below can push the abutment component 140 downward, so that the abutment component 140 can lift the blade. In this way, compared with a blade lifting mechanism with only one pushing part, a blade lifting mechanism with two blade lifting parts, the first pushing part 120 and the second pushing part 130, moving alternately in the vertical direction can significantly increase the frequency and duration of blade lifting. This allows the jigsaw to lift the blade when the saw blade rises and falls. Lifting the blade when the saw blade rises can improve cutting efficiency, and lifting the blade when the saw blade falls can repair chipped edges and improve cutting quality.

[0052] In some embodiments, the lifting mechanism may further include a bearing housing (not shown) and a first fixing pin 151 and a second fixing pin 152 fixedly connected to the bearing housing. The rotating disk 150 can rotate about the rotation axis of the central gear 311, and the first fixing pin 151 and the second fixing pin 152 can be located on the side of the rotating disk 150 away from the power unit 210.

[0053] In some embodiments, the first pushing part 120 may have a first rotating hole 121, with an eccentric protrusion 3121 located within the first rotating hole 121. The gear 312 and the eccentric protrusion 3121 drive the first pushing part 120 to rotate around the first fixing pin 151, allowing the first pushing part 120 to reciprocate at least in the vertical direction. When the gear 312 rotates, it drives the eccentric protrusion 3121 to rotate around the rotation axis. The distance between the upper edge of the eccentric protrusion 3121 and the rotation axis continuously changes, thereby causing the position of the first pushing part 120 to continuously change in the vertical direction. The first pushing part 120 can rotate around the first fixing pin 151 within a certain angle range.

[0054] The second pushing part 130 may have a second rotating hole 131, and an eccentric protrusion 3121 is located in the second rotating hole 131. The gear 312 and the eccentric protrusion 3121 drive the second pushing part 130 to rotate around the second fixing pin 152. The second pushing part 130 can reciprocate at least in the vertical direction. When the gear 312 rotates, the gear 312 drives the eccentric protrusion 3121 to rotate around the rotation axis. The distance between the upper edge of the eccentric protrusion 3121 and the rotation axis changes continuously, thereby driving the position of the second pushing part 130 to change continuously in the vertical direction. The second pushing part 130 can rotate around the second fixing pin 152 within a certain angle range.

[0055] In some embodiments, the first rotating hole 121 and the second rotating hole 131 can be elliptical in shape, having a major axis and a minor axis. As the gear 312 rotates about its axis of rotation, the position of the eccentric protrusion 3121 in the first rotating hole 121 and the position of the eccentric protrusion 3121 in the second rotating hole 131 continuously change. When the eccentric protrusion 3121 is above the first rotating hole 121 and below the second rotating hole 131, the first pushing part 120 is positioned below the second pushing part 130, and the first pushing part 120 can push downwards against the assembly 140. When the eccentric protrusion 3121 is above the second rotating hole 131 and above the first rotating hole 121, the first pushing part 120 is positioned above the second pushing part 130, and the second pushing part 130 can push downwards against the assembly 140.

[0056] It is understandable that the maximum distance between the outer edge of the eccentric protrusion 3121 and the rotation center of the gear 312 is the major radius, and the minimum distance is the minor radius. The difference between the major and minor radii is the eccentricity of the eccentric protrusion 3121. The magnitude of the eccentricity is the amount by which the first pushing part 120 can move vertically, and the magnitude of the eccentricity is also the amount by which the second pushing part 130 can move vertically.

[0057] In some embodiments, the first pushing part 120 and the second pushing part 130 may be located between the power part 210 and the gear 312. The first pushing part 120 may have a first through hole 122, and the second pushing part 130 may have a second through hole 132. The central gear 311 may pass through the first through hole 122 and the second through hole 132. If the first pushing part 120 and the second pushing part 130 are located between the power part 210 and the gear 312, then the eccentric protrusion 3121 is located between the power part 210 and the gear 312. The central gear 311 connected to the power part 210 meshes with the gear 312, and the central gear 311 may pass through the first pushing part 120 and the second pushing part 130. Therefore, the first pushing part 120 may have a first through hole 122, the second pushing part 130 may have a second through hole 132, and the central gear 311 may pass through the first through hole 122 and the second through hole 132 to mesh with the gear 312.

[0058] In other embodiments, the first pushing part 120 and the second pushing part 130 may also be located on the side of the gear 312 away from the power part 210. In this case, the eccentric protrusion 3121 is located on the side of the gear 312 away from the power part 210, and the gear 312 is located between the power part 210 and the eccentric protrusion 3121. In this case, the central gear 311 connected to the power part 210 can directly mesh with the gear 312. The central gear 311 does not need to pass through the first pushing part 120 and the second pushing part 130. The first pushing part 130 does not need to have a first through hole 122, and the second pushing part 132 does not need to have a second through hole 132 (not shown in the figure).

[0059] In some embodiments, the abutment assembly 140 may include: a roller frame 240, one end of which faces the first pusher 120 or the second pusher 130, and the first pusher 120 or the second pusher 130 pushes the roller frame 240 to rotate about the third fixing pin 160; and a roller 340, fixed to the other end of the roller frame 240, which moves at least horizontally when the roller frame 240 rotates about the third fixing pin 160. One end of the roller frame 240 is directly opposite the first pusher 120 or the second pusher 130, that is, the top surface of the roller frame 240 is directly opposite the first pusher 120 or the second pusher 130. The first pusher 120 and the second pusher 130 can push the top surface of the roller frame 240, causing the roller frame 240 to rotate about the third fixing pin 160. When the top surface of the roller frame 240 moves downward in the vertical direction, the roller 340 moves in the horizontal direction toward the saw blade. The roller 340 can apply force to the saw blade to bring it closer to the workpiece, thus achieving the lifting action. When the top surface of the roller frame 240 moves downward in the vertical direction, the roller 340 moves in the horizontal direction away from the saw blade and does not perform the lifting action.

[0060] In some embodiments, the jigsaw's blade-lifting mechanism may further include a stop pin 170, which can control the vertical position adjustment of the top surface of the abutment component 140. The jigsaw's blade-lifting mechanism may include multiple blade-lifting positions and non-blade-lifting positions. When the user adjusts the jigsaw's blade-lifting position to the non-blade-lifting position, the stop pin 170 can press the abutment component 140 downwards, causing the top surface of the abutment component 140 to descend vertically. Even when the first pushing part 120 and the second pushing part 130 reach their lowest position, they still cannot contact the top surface of the abutment component 140, and the jigsaw's blade-lifting mechanism cannot perform a blade-lifting action. When the user adjusts the jigsaw's blade lifting position from the non-blade lifting position to the blade lifting position, the position pin 170 can move upward a certain distance, causing the top surface of the abutment component 140 to move upward a certain distance. When the first push part 120 and the second push part 130 move downward, they can contact the top surface of the abutment component 140 and push the abutment component 140 downward to achieve the blade lifting action.

[0061] Understandably, the higher the knife-lifting gear, the higher the gear pin 170 is vertically, the higher the top surface of the abutment component 140 is vertically, the greater the distance the first pusher 120 and the second pusher 130 can push the abutment component 140 to move vertically, the greater the distance the abutment component 140 can move horizontally, and the greater the degree of knife lifting. Conversely, the lower the knife-lifting gear, the lower the gear pin 170 is vertically, the lower the top surface of the abutment component 140 is vertically, the smaller the distance the first pusher 120 and the second pusher 130 can push the abutment component 140 to move vertically, the smaller the distance the abutment component 140 can move horizontally, and the smaller the degree of knife lifting.

[0062] In some embodiments, the lifting mechanism of the jigsaw may further include a lifting pin 180, wherein a first pushing part 120 and a second pushing part 130 can push the lifting pin 180 to move vertically, and the lifting pin 180 can push the abutment component 140 to move at least horizontally. When the lower of the first pushing part 120 and the second pushing part 130 pushes the lifting pin 180 downward, the lifting pin 180 can push the abutment component 140 downward, thereby causing the abutment component 140 to move horizontally toward the saw blade, pushing the saw blade toward the workpiece, and realizing the lifting action. When the lower of the first pushing part 120 and the second pushing part 130 moves upward, the pushing part cannot push the lifting pin 180 downward, and the abutment component 140 will be subjected to the load force from the workpiece transmitted through the saw blade. The abutment component 140 moves horizontally toward the direction away from the saw blade, and the abutment component 140 moves vertically upward, pushing the lifting pin 180 to also move upward.

[0063] It should be noted that the lifting pin 180 is not fixed to the first pushing part 120 or the second pushing part 130, and the lifting pin 180 is not fixed to the top surface of the abutment component 140. In the vertical direction, the lifting pin 180 can move independently. When the lifting pin 180 moves upward, it is subjected to an upward workpiece load force transmitted from the abutment component 140. When the lifting pin 180 moves downward, it is subjected to a downward pressing force from the first pushing part 120 or the second pushing part 130.

[0064] When the jigsaw's blade-lifting mechanism is in operation, the power unit 210 first rotates, driving the central gear 311 to rotate. The central gear 311 drives the gear 312, which meshes with it, to rotate around its axis. The rotation of the gear 312 around its axis drives the eccentric protrusion 3121 to rotate around its axis. The rotation of the eccentric protrusion 3121 around its axis drives the first pushing part 120 and the second pushing part 130 to move alternately in the vertical direction, thus realizing the movement of the first pushing part 120 and the second pushing part 130 driven by the drive assembly 110. When the lower of the first pushing part 120 and the second pushing part 130 moves downward, it pushes the blade-lifting pin 180 downward. The downward movement of the blade-lifting pin 180 pushes the top surface of the roller frame 240 downward, thereby pushing the roller frame 240 to rotate around the third fixing pin 160, causing the roller 340 to move horizontally towards the saw blade, thus realizing the blade-lifting action. Since the first pushing part 120 and the second pushing part 130 move alternately in the vertical direction, the blade can be lifted both when the saw blade is in the cutting stroke and when the saw blade is in the idle stroke. This can improve cutting efficiency, reduce edge breakage, and improve the quality of blade lifting.

[0065] This disclosure provides a lifting mechanism for a jigsaw, including a driving assembly, a first pushing part, a second pushing part, and a stop assembly. The driving assembly drives the first and second pushing parts to move alternately at least vertically, and the first or second pushing part pushes the stop assembly to move at least horizontally. Thus, the first and second pushing parts can alternately push the stop assembly downwards, allowing the stop assembly to lift the blade during both the cutting stroke in one direction and the idle stroke in the other direction. This improves the cutting efficiency of the jigsaw while reducing edge chipping and enhancing the cutting quality.

[0066] Accordingly, another embodiment of this disclosure also provides a jigsaw. The semiconductor structure provided in another embodiment of this disclosure will be described in detail below with reference to the accompanying drawings. For parts that are the same as or corresponding to the previous embodiment, please refer to the corresponding descriptions of the foregoing embodiments; detailed descriptions will not be repeated below.

[0067] Figure 9 This is a three-dimensional structural diagram of the jigsaw provided in an embodiment of the present disclosure. Figures 10 to 12 This is a side view of the jigsaw structure in various directions provided in the embodiments of this disclosure. Figure 13 This is a schematic diagram of the internal structure of a jigsaw provided in an embodiment of this disclosure.

[0068] refer to Figures 9 to 13 The jigsaw includes: a blade lifting mechanism 10 as described in any of the above embodiments; a jigsaw body 20, with the blade lifting mechanism 10 located within the jigsaw body 20; a base 30 for supporting the jigsaw body 20; and a saw blade 40 mounted on the jigsaw body 20 and protruding beyond the base 30 to cut the workpiece. The saw blade 40 has opposing front and back sides, with serrations on the front side, and abuts against assembly 140 (see reference). Figure 3 It is located on the back of the saw blade.

[0069] The lifting mechanism 10 is located inside the jigsaw body 20, and when the jigsaw is operating, the roller 340 in the lifting mechanism 10 (reference) Figure 3 The roller 340 can reciprocate in the horizontal direction. When the roller 340 moves in the horizontal direction toward the saw blade 40 and applies a force toward the workpiece to the saw blade 40, it can lift the blade. In the above embodiment, the blade lifting mechanism 10 can lift the blade both during the cutting stroke and during the idle stroke. Lifting the blade during the cutting stroke can improve the cutting efficiency of the jigsaw, and lifting the blade during the idle stroke can correct the chipping on the workpiece and improve the cutting quality of the jigsaw.

[0070] It should be noted that the saw teeth of the jigsaw blade 40 have an orientation direction. When the jigsaw cuts the workpiece, the saw blade 40 reciprocates in the vertical direction. In some embodiments, the saw teeth of the saw blade 40 face upwards. When the saw blade 40 moves upwards, it cuts the workpiece; that is, the upward stroke of the saw blade 40 is the cutting stroke of the jigsaw. When the saw blade 40 moves downwards, it does not cut the workpiece; that is, the downward stroke of the saw blade 40 is the idle stroke of the jigsaw.

[0071] In other embodiments, the saw teeth of the saw blade 40 may also face downwards. When the saw blade 40 moves downwards, it cuts the workpiece, which is the cutting stroke of the jigsaw; when the saw blade 40 moves upwards, it does not cut the workpiece, which is the idle stroke of the jigsaw. The following description uses the example of the jigsaw blade 40 facing upwards. If the jigsaw teeth face downwards, the movement directions of the components in the lifting mechanism of the jigsaw described below can be reversed.

[0072] In some embodiments, when the jigsaw is cutting with the blade lifting function activated, the correspondence between the operation of the first pushing part 120 and the second pushing part 130 and the operation of the saw blade 40 is adjustable, and this disclosure does not limit this. The following will describe the blade lifting at 45° in advance as an example. Lifting the blade at 45° in advance means that when the gear is at the 0° position, the saw blade begins to move downwards; when the gear is at -45°, the first pushing part begins to push downwards against the assembly 140 to lift the blade; when the gear rotates to the 0° position, that is, when the saw blade 40 begins to move downwards, the blade lifting has already begun and a certain amount of lifting has been achieved.

[0073] Figure 14 This is a schematic diagram showing the lifting trajectories of the first pushing unit 120 and the second pushing unit 130 during operation of the jigsaw provided in this embodiment of the disclosure. Figure 15 This is a schematic diagram of the lifting trajectory of the first pushing part 120 and the second pushing part 130 operating together during the operation of the jigsaw provided in this embodiment of the disclosure.

[0074] refer to Figure 14 Curve a represents the operating curve of the first push unit 120 operating alone, and curve b represents the operating curve of the second push unit 130 operating alone. The vertical axis represents the position of the saw blade 40 in the vertical direction. When the vertical axis is 0mm, the saw blade 40 is at its lowest position; when the vertical axis is 26mm, the saw blade 40 is at its highest position. The saw blade 40 reciprocates between 0mm and 26mm. When the vertical axis moves from 0mm to 26mm, the saw blade 40 moves upward and performs the cutting stroke; when the vertical axis moves from 26mm to 0mm, the saw blade 40 moves downward and performs the idle stroke. The horizontal axis represents the lifting amount, which is the horizontal distance that the roller 340 in the abutment assembly 140 moves. When the horizontal axis moves from 0mm to 2.5mm, the roller 340 moves closer to the saw blade 40, and the lifting amount increases. When the horizontal axis moves from 2.5mm to 0mm, the roller 340 moves further away from the saw blade 40, and the lifting amount decreases.

[0075] Curve a represents the operating curve of the first pushing unit 120 operating alone. When the first pushing unit 120 operates alone, with the saw blade 40 at its lowest point, the gear 312 rotates 180°. As the saw blade 40 moves upward for the cutting stroke, the gear 312 begins to rotate, driving the first pushing unit 120 upward. However, it cannot push the roller 340 in the abutment assembly 140 towards the saw blade 40. The abutment assembly 140 is subjected to load forces from the workpiece and the saw blade, causing the roller 340 to move away from the saw blade, gradually reducing the lifting amount. When the gear 312 rotates to the -45° position, the lifting amount reaches its minimum, the first pushing unit 120 reaches its highest point, and then begins to move downward. When gear 312 rotates to the 0° position, saw blade 40 reaches its highest point. The first pushing part 120 moves downward a certain distance, and the lifting amount increases relative to the minimum value. Saw blade 40 begins to descend, entering its idle stroke. At this time, the first pushing part 120 continues to move downward, pushing the roller 340 in the abutment assembly 140 towards the direction closer to saw blade 40, and the lifting amount continues to increase. When gear 312 rotates to the 135° position, the first pushing part 120 reaches its lowest point, and the lifting amount reaches its maximum value of 2.5mm. The first pushing part 120 begins to move upward, the lifting amount begins to decrease, and saw blade 40 continues to move downward for its idle stroke.

[0076] It can be seen that when the first pushing unit 120 operates alone, before the saw blade 40 moves downward from its highest point to perform the cutting stroke, the first pushing unit 120 has already begun to move upward, and the lifting amount has already begun to increase. That is to say, when the gear 312 is at a position of -45° to 135°, the roller 340 pushes the saw blade 40 towards the direction closer to the saw blade 40, increasing the lifting amount and realizing the lifting action. Lifting the blade during the idle stroke of the saw blade's downward movement can correct the chipping on the workpiece cutting surface and improve the cutting quality.

[0077] Similarly, curve b represents the operating curve of the second push unit 130 operating alone. It can be seen that when the second push unit 130 operates alone, when the saw blade 40 is at its lowest point, the rotation position of gear 312 is 0°. When the saw blade 40 moves upward for the cutting stroke, gear 312 begins to rotate, driving the second push unit 130 upward, and the lifting amount gradually decreases. When gear 312 rotates to the 45° position, the lifting amount reaches its minimum, the second push unit 130 reaches its highest point, and the second push unit 130 begins to move downward. When gear 312 is in a position between 45° and 225°, the second push unit 130 continues to move downward, pushing the roller 340 in the abutment assembly 140 towards the direction closer to the saw blade 40, and the lifting amount gradually increases. During this period, when gear 312 is in a position between 45° and 180°, the saw blade 40 continues to move upward for the cutting stroke; when gear 312 is in a position between 180° and 225°, the saw blade 40 begins to move downward for the idle stroke. When gear 312 is positioned between 225° and 0°, the saw blade 40 moves downwards for its idle stroke, while the second pusher 130 moves upwards, gradually reducing the blade lifting amount. Lifting the blade during the upward cutting stroke of the saw blade 40 improves the cutting efficiency of the jigsaw.

[0078] refer to Figure 15 , Figure 15 The graph shows the running curve of the first pusher 120 and the second pusher 130 operating together. The vertical axis represents the rotational position of the gear, and the horizontal axis represents the lifting amount of the jigsaw. The operation of the first pusher 120 and the second pusher 130 is the same as when they operate alone. The lower one of the first pusher 120 and the second pusher 130 can contact the lifting pin 180, while the upper one of the first pusher 120 and the second pusher 130 cannot contact the lifting pin 180.

[0079] As can be seen, when the first pushing unit 120 and the second pushing unit 130 operate together, the jigsaw can lift its blade during the entire rotation of the gear 312 from 0° to 360°, which is also the entire process of the saw blade 40 moving upwards for the cutting stroke and downwards for the idle stroke. Lifting the blade during the upward cutting stroke of the saw blade 40 allows the roller 340 in the abutment assembly 140 to push the saw blade closer to the workpiece, improving the cutting efficiency of the jigsaw; lifting the blade during the downward idle stroke of the saw blade 40 can correct the chipping on the cut surface of the workpiece, improving the cutting quality.

[0080] This disclosure provides a jigsaw, including: a lifting mechanism as described in any of the above embodiments; a jigsaw body, with the lifting mechanism located within the jigsaw body; a base for supporting the jigsaw body; and a saw blade, mounted on the jigsaw body and protruding beyond the base for cutting the workpiece. The saw blade has a front and a back side, the front side having serrations, and an abutment component located on the back side of the saw blade. Thus, the first and second pushing parts in the jigsaw lifting mechanism can alternately push the abutment component downwards, allowing the abutment component to lift the saw blade during both the cutting motion in one direction and the idle stroke in another direction. This improves the cutting efficiency of the jigsaw while reducing edge chipping and enhancing the cutting quality.

[0081] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of this disclosure. Any person skilled in the art can make their own modifications and alterations without departing from the spirit and scope of this disclosure; therefore, the scope of protection of this disclosure should be determined by the scope defined in the claims.

Claims

1. A lifting mechanism for a jigsaw, characterized in that, include: Jigsaw body; A saw blade, which is mounted to the jigsaw body to cut the workpiece. A drive assembly is mounted on the jigsaw body and drives the saw blade to reciprocate. The first and second pushing parts are driven by the driving assembly, which drives the first and second pushing parts to move alternately at least in the vertical direction. The abutting assembly, wherein the first pushing part and the second pushing part alternately push the abutting assembly to move at least in the horizontal direction, so as to push the saw blade closer to the workpiece during the cutting stroke and the idle stroke.

2. The lifting mechanism of the jigsaw according to claim 1, characterized in that, The driving component includes: The power unit and the transmission unit connected to the power unit, wherein the power unit drives the transmission unit to rotate, and the transmission unit drives the first push unit and the second push unit to move.

3. The lifting mechanism of the jigsaw according to claim 2, characterized in that, The transmission unit includes: The power unit drives the central gear to rotate; A gear, wherein an eccentric protrusion is provided on one side of the gear, the rotation axis of the gear passes through the eccentric protrusion, and the center of the eccentric protrusion is offset from the rotation axis of the gear, and the central gear drives the gear to rotate.

4. The lifting mechanism of the jigsaw according to claim 3, characterized in that, In the vertical direction, the first pushing part moves in the opposite direction to the second pushing part.

5. The lifting mechanism of the jigsaw according to claim 3, characterized in that, The first pushing part has a first rotating hole, the eccentric protrusion is located in the first rotating hole, and the gear and the eccentric protrusion drive the first pushing part to rotate around the first fixed pin. The first pushing part reciprocates at least in the vertical direction. The second pushing part has a second rotating hole, the eccentric protrusion is located in the second rotating hole, and the gear and the eccentric protrusion drive the second pushing part to rotate around the second fixed pin. The second pushing part reciprocates at least in the vertical direction.

6. The lifting mechanism of the jigsaw according to claim 5, characterized in that, The first pushing part and the second pushing part are located between the power part and the gear. The first pushing part has a first through hole, and the second pushing part has a second through hole. The central gear passes through the first through hole and the second through hole.

7. The lifting mechanism of the jigsaw according to claim 1, characterized in that, The contact component includes: A roller frame, one end of which is opposite to the first pushing part or the second pushing part, and the first pushing part or the second pushing part pushes the roller frame to rotate around the third fixing pin; A roller is fixed to the other end of the roller frame, and when the roller frame rotates about the third fixing pin, the roller moves at least in the horizontal direction.

8. The lifting mechanism of the jigsaw according to claim 1, characterized in that, Also includes: A shift pin, wherein the shift pin controls the position of the top surface of the abutment component to be adjustable in the vertical direction.

9. The lifting mechanism of the jigsaw according to claim 1, characterized in that, Also includes: The lifting pin is pushed vertically by the first pushing part and the second pushing part, and the lifting pin pushes the abutting component to move at least horizontally.

10. A jigsaw, characterized in that, include: A knife-lifting mechanism, comprising: a driving component, a first pushing part, a second pushing part, and a supporting component; the driving component drives the first pushing part to rotate around a first fixed pin, and the driving component drives the second pushing part to rotate around a second fixed pin; The driving component is used to drive the first pushing part and the second pushing part to move alternately at least in the vertical direction; The jigsaw body has the blade lifting mechanism located inside it. A base for supporting the jigsaw body; A saw blade, which is mounted on the body of the jigsaw and protrudes beyond the base to cut the workpiece, the saw blade having opposing front and back sides, the front side having serrations, and the abutment assembly located on the back side of the saw blade; The first and second pushing parts alternately push the abutting assembly to move at least horizontally, so as to push the saw blade closer to the workpiece during the cutting stroke and the idle stroke.

Images