Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
  • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
  • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
  • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
  • B26D1/26—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
  • B26D1/30—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut with limited pivotal movement to effect cut
  • B26D1/305—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut with limited pivotal movement to effect cut for thin material, e.g. for sheets, strips or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
  • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
  • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
  • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
  • B26D1/26—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
  • B26D1/30—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut with limited pivotal movement to effect cut
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D17/00—Shearing machines or shearing devices cutting by blades pivoted on a single axis
  • B23D17/02—Shearing machines or shearing devices cutting by blades pivoted on a single axis characterised by drives or gearings therefor
  • B23D17/08—Shearing machines or shearing devices cutting by blades pivoted on a single axis characterised by drives or gearings therefor actuated by hand or foot operated lever mechanism
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D5/08—Means for actuating the cutting member to effect the cut
  • B26D5/10—Hand or foot actuated means

Definitions

• the invention relates to a cutting device with a frame, egg nem it pivotally mounted about a first pivot axis cutting knife and a reduction gear, which each carries the pivoting movement of several consecutive back and forth pivoting movements egg nes drive arm in a cutting pivoting movement of the cutting knife, wherein the cutting knife (3) pivoted from an initial position into an end cutting position can be brought back into the initial position with a cutting knife pivoting device (20, 21, 22, 23).
• a cutting device of the generic type is described in DE 3191174.
• the cutting device described there has a fixed jaw and a movable jaw which is pivotable about an axis of rotation relative to the fixed jaw and which has a toothed arch into which a pawl with a Drive arm engages non-rotatably coupled gear.
• a pawl can hold the movable jaw in a pivoted position after a pivoting movement of the drive arm. By operating a foot lever, the pawl can be released so that the movable jaw can pivot back into a starting position under its own weight.
• the US 4,055,891 describes a cable cutter with a latching pawl that can engage in a circumferential toothing of a movable cutting jaw.
• Lifting cylinder with which a movable cutting jaw can be pivoted relative to a fixed cutting jaw.
• a tension spring is provided to return the cutting jaw to its starting position.
• Lever-translated cutting devices in which a drive arm under the interposition of a pawl gear rotates a first wheel of a reduction gear, which has a toothing which engages in a counter toothing of a cutting knife, are from DE 947218, DE 363 991, DE 36 31 162 and DE 319 174 previously known.
• WO 2010/010169 A1 and CN 203993976 U describe cutting devices in which a cutting wheel can be rotated step by step by pivoting a drive arm.
• the invention is based on the object of developing a cutting device of the generic type in an advantageous manner.
• the object is achieved by the invention specified in the claims, the subclaims not only representing advantageous developments of the invention specified in claim 1, but also independent solutions to the problem.
• the invention proposes that the cutting knife pivoting back device couples the drive arm with the cutting knife.
• the cutting knife can be brought back into the starting position by pivoting the drive arm back.
• the coupling takes place in such a way that the cutting knife is dragged along by the drive arm when the drive arm is swiveled back.
• the cutting knife-back pivoting device With this cutting knife-back pivoting device, the cutting knife, which has been brought from a starting position into a cutting end position during the cutting movement, can be brought back into the starting position by preferably a single pivoting back movement.
• a cutting device with a frame, a cutting knife attached to it so as to be pivotable about a first pivot axis, with a reduction gear, which transmits the pivoting movement of multiple back and forth pivoting movements of a drive arm into a cutting pivoting movement of the cutting knife, such as a cutting device handle with the drive arm attached directly to the cutting knife. Nevertheless, a greater cutting force can be applied to the cutting knife by means of the reduction gear.
• the cutting device can be designed as a laminate cutter and have a frame which has the properties described in DE 10 2009 003 490 A1.
• the frame consists of two carriers running parallel to one another, which are preferably designed as hollow bodies. It can be box-shaped extrusion parts. Feet with which the frame can be attached to a surface are attached to the two ends. Between the two parallel beams on which the un- Reduction gear is attached, a gap extends into which the cutting knife, which preferably has a blunt cutting edge, can enter in order to punch out a strip of material from a laminate plate or the like that has been placed on a support. The gap width of the gap is given only slightly wider than the material thickness of the cutting knife made of sheet metal.
• the reduction gear can have a diameter primary gear that engages in a toothing.
• This toothing is preferably formed by a second wheel, which can have a larger diameter than the first wheel.
• the rotational movement of the first wheel is transmitted to a toothing of the cutting knife, which extends on an arc whose radius is larger than the radius of the toothing of the first wheel.
• the reduction gear preferably has an odd number of gears, so that the direction of rotation of the first gear matches the direction of rotation of the cutting knife.
• a type of blade lock is provided which transmits a pivoting movement of the drive arm to the reduction gear, but not a pivoting movement back.
• a coupling member is provided in particular with which the drive arm is coupled to the cutting knife.
• the coupling member is preferably a pulling element with which a train can be exerted on the cutting knife when the drive arm is swiveled back against the swinging movement.
• a swivel clearance is provided.
• the drive lever can with a first, in particular low amplitude swiveled back and forth to swivel the cutting knife in the cutting direction. After the cutting process, the cutting knife can be moved back into an initial position with an in particular special greater amplitude or a greater pivoting back path.
• the coupling member, with which the drive arm is coupled to the cutting knife has in particular a swiveling freedom that comes into effect when the cutting knife is shifted when cutting.
• the swivel clearance can be formed by a first elongated hole in which a driver can move. The elongated hole can be arranged in the coupling member.
• the elongated hole can also be arranged in the cutting blade or in the first wheel or in a drive wheel.
• a driver that engages in the elongated hole can move back and forth during the cutting movement carried out with a lower amplitude.
• a locking element can be provided, which it fills the function of a pawl in a pawl gear. This locking element is preferably assigned to the drive arm.
• the drive arm can have a second slot in which the locking element can move back and forth between a power transmission position and a release position. In the power transmission position, the locking element rests on a drive toothing of a drive tooth.
• the drive tooth is preferably part of a drive wheel having a plurality of drive teeth.
• the drive wheel can be rotatably connected to the first gear of the reduction gear.
• the drive tooth During a pivoting movement, the drive tooth is in the power transmission position.
• the drive tooth has a remindicar term flank, which can form a curved control curve with which the locking element is shifted during the backward pivoting movement from the power transmission position into a release position in which the locking element can overrun one or more drive teeth during the backward pivoting movement, so that with two or more strokes of the drive arm the cutting knife is pivoted step by step from its starting position into its cutting end position can.
• the locking element is at the same time a fastening element with which the coupling element, which is preferably a tension element, is fastened to the drive arm.
• the fastening member with which the coupling member is fastened to the drive arm is preferably arranged at a first end of the coupling member.
• the second end of the coupling member can be formed by a first end of the first elongated hole in which a second fastening member can move, with which the coupling member is fastened to the cutting knife.
• the second fastening member can move back and forth between the first end of the first elongated hole and a second end of the first elongated hole when the cutting knife is rotated in the cutting direction by way of the reciprocating movement of the drive arm.
• the drive arm In order to pivot the cutting knife back from the cutting end position or an intermediate position between the starting position and the cutting end position in the starting position, the drive arm is shifted in the pivoting back direction until the driver engaging in the first elongated hole, preferably formed by a fastening member, at the first end of the Elongated hole. Then a train can be exerted on the cutting knife when pivoting the drive arm on the Kop pel link, which the
• the fastening member is formed by the locking element or can move together with the locking element in the second elongated hole, which is arranged in the drive arm.
• the second elongated hole can extend in such a direction, preferably even at an angle to the direction of extent of the drive arm, that the force transmitted to the coupling member holds the locking element in the release position.
• the drive teeth of the drive wheel can rotate freely under the locking element when the cutting knife is pivoted back. It is therefore not necessary that when pivoting the drive arm back to move the cutting knife into the starting position, a drive wheel has to be decoupled from the reduction gear.
• the first Coverage direction of the second elongated hole is selected such that the locking member is only shifted from the release position back into the power transmission position when the cutting knife is completely moved back into the starting position or the pivoting direction is changed.
• the locking element in the second elongated hole moves back into its power transmission position.
• the locking element can also be displaced from the force transmission position into the release position, so that the drive arm can be brought into a parallel position to the carrier formed by the frame.
• the cutting device reaches a compact storage position in which the cutting knife also assumes its cutting end position.
• means for limiting the swiveling of the cutting knife can be provided. It can be slings.
• the cutting knife preferably has an arc slot into which a stop pin attached to the frame engages. The stop pin is in the starting position and in the pivoting end position in each case at one end of the arc slot.
• the toothing of the first wheel engages in the same toothing of the second wheel that also engages a toothing of the cutting knife.
• the cutting knife can be formed mechanically by a two-armed lever, the lever arms being essentially diametrically opposite one another.
• a lever arm forms the curved cutting edge, which forms an intersection moving along the slot during the cutting movement.
• the other lever arm forms a toothing that is part of the Unterschge gearbox and that preferably meshes with the teeth of the second wheel, which also meshes with the teeth of the first wheel.
• the cutting knife, the second wheel and the first wheel are preferably in a common plane.
• the second wheel can turn in the gap into which the cutting knife plunges during the cutting movement.
• the first wheel can be connected non-rotatably to two drive wheels, the first wheel being arranged between the two drive wheels. net is.
• the drive arm can have two linear strips, between which the two drive wheels are arranged. In the space between the two bars there can also be two coupling links that are attached to the two opposite broad sides of the cutting knife.
• a handle can be arranged at the free end of the two strips.
• the pulling element can be formed by two straight pull rods or links.
• the pivot axis of the Antriebsar mes can be carried by a bearing block, which also supports the first gear of the reduction gear.
• a stop can be provided which is attached to the frame. The cutting knife dips into the stop in some areas so that a laminate plate lying on the support and supported on the stop can be divided by the cutting knife. An intersection point moves from a position remote from the stop in the direction of the stop.
• Fig. 1 is a first perspective view of a Schneidvorrich device in which the cutting knife is in a Schneidendstel development, Fig. La the section Ia in Figure 1,
• Fig. 2 is a second perspective view of the Schneidvorrich device in which the cutting knife 3 is in a starting position in which a plate to be cut, for example laminate or PVC plate, can be placed on a support 11, 2a enlarges the section Ha in FIG. 2,
• a plate to be cut for example laminate or PVC plate
• FIG. 4a enlarges the detail IVa in FIG. 4,
• Fig. 7 shows a subsequent representation in which the drive arm via this
• Pivot position has been pivoted out into a pivot end position in which the locking element 24 has shifted back into the power transmission position
• Fig. 8 shows a subsequent representation after a first pivot stroke of the drive arm 8 in a forward pivoting direction H, in which the first wheel 5 of a reduction gear is driven in rotation has been and the reduction gear has shifted the cutting knife 3 in the cutting direction,
• Fig. 9 is a subsequent representation, according to which the drive arm in back
• Fig. 10 shows a subsequent representation after a second pivot stroke in the
• Swiveling movement H in which the cutting knife 3 has been pivoted into egg ne pivoting end position; the drive arm 6 can be pivoted from this position further into the storage position shown in Figure 4,
• FIG. 10a enlarges the detail Xa in FIG. 10.
• the cutting device has a frame 1, which has essentially two carriers formed as hollow bodies, which run parallel to one another and form a support 11 for a workpiece.
• a gap 10 extends between the two carriers, into which a cutting knife 3 with a
• the carriers are connected to one another by means of end pieces.
• the two end pieces are formed by feet 13 with which the frame can be supported on a base in such a way that the two carriers float freely over the base so that the cutting edge 3 'of the cutting knife 3 can penetrate through the carrier.
• the bearing block 14 supports two drive wheels 29, between which there is a first wheel 5 of a reduction gear, which is fastened in a rotationally fixed manner to the drive wheels 29.
• the drive wheels 29 can be pivoted together with the first wheel 5 about a pivot axis 15.
• the bearing block 14 preferably consists of a plurality of plates resting against one another, with two outer bearing plates 35 supporting the pivot axis 15 and a plurality of spacer plates 36 are arranged between the bearing plates 35.
• the two drive wheels 29 form drive teeth 26 which each have a drive flank 27 and a rear flank 28.
• the drive arm 6 has an elongated hole 25 into which a locking element 24 can move.
• the locking element 24 can assume a power transmission position in which it rests against the drive flank 27 so that a pivoting movement of the drive arm can be transferred to a rotary movement of the first wheel 5.
• the locking element 24 can also assume a release position in which the drive wheel 29 can rotate freely.
• a toothing 7 of the gear 5 engages in a toothing 8 of a second wheel 4 rotatable about an axis of rotation 16.
• the same toothing 8 also engages a toothing 9 of the cutting knife 3, which is mounted pivotably about a pivot axis 2 on the frame 1.
• a stop pin 32 engaging in an arcuate slot 31 of the cutting knife 3, the pivoting movement of the cutting knife 3 between two end positions is restricted.
• a coupling member 20 is formed by two tie rods, each of which has an elongated, in particular straight shape.
• the coupling member 20 is, in particular, a tension element with an elongated hole 21 extending in its direction of extent, in which a driver engages which is formed by a fastening element 22 with which the two tension elements 20 are attached to the two broad sides of the cutting knife 3 facing away from one another .
• the driver can move in the elongated hole 21 with the formation of a clearance.
• the long hole 21 has a first end 21 ', which limits the clearance in one direction be.
• the elongated hole 21 has an enlarged diameter area that forms an assembly opening.
• the first fastening member 22 does not come into the area of the end 21 ', so that the clearance is slightly smaller than the distance between the both ends 21 ', 21 ".
• a further fastening member 23 is provided, which is formed in the exemplary embodiment by the locking element 24 formed as a round bolt.
• the coupling member 20 is fastened to the locking element 24 on this fastening member 23, so that the coupling member 20 is able, depending on the pivoting position of the drive arm 6, to exert a force which points in a different direction in relation to the direction in which the elongated hole 25 extends, so that the Locking element 24 can be shifted either into its power transmission position or into its release position depending on the pivot angle of the drive arm 6. The force also depends on the pivoting direction of the drive arm 6.
• the operation of the cutting device is as follows:
• the cutting knife 3 In a safekeeping position shown in FIG. 4, the cutting knife 3 assumes its cutting end position, in which the stop pin 32 is at the end of the arcuate slot 31. The cutting edge 3 ′ is completely immersed in the space between the two carriers 33. The locking element 24 can be brought out of engagement with the drive teeth 26. It is in its release position. A stop pin 34 is supported on the cutting knife 3, so that the drive arm 6 runs parallel to the carrier 33. If the drive arm 6 is brought from this safe-keeping position in the pivoting movement R back into the position shown in FIG. 5, the fastening member 22 migrates through the elongated hole 21 until it has reached the end 21 '. During this pivot movement, only the drive arm 6 is pivoted, but not the cutting knife 3.
• the end 21 'of the elongated hole 21 engages the fastening member 22 and exerts a torque on the cutting knife 3, so that this in the course the pivoting movement of the drive arm 6 is pivoted into the pivot position shown in FIG. In this position the cutting knife 3 assumes its starting position.
• the stop pin 32 is at the other end of the arcuate slot 31.
• the slot 25 has an obtuse angle to the direction of extension of the coupling member 20 during this pivoting movement, so that the coupling member 20 to the Locking element 24 applied tensile force holds the locking element 24 in the release position. It proves to be advantageous if the direction of extent of the elongated hole 25 runs obliquely to the direction of extent of the drive arm 6 ver.
• the power transmission position can, however, also be achieved in that, starting from the open position shown in FIG. 6, the drive arm 6 is displaced in a pivoting movement H. The acute angle in FIG. 6 then becomes the obtuse angle again.
• the locking element 24 overflows the rear flank 28 of the drive tooth 26.
• the driver formed by the fastening member 22 wanders in the elongated hole 21 again Hike to the end of 21 '.
• the elongated hole 21 thus forms a swivel movement clearance for the drive arm 6 during the cutting operation.
• the drive arm 6 can be pivoted again in a pivoting movement H to perform a second cutting stroke.
• the locking element 24 moves back into the power transmission position and can transmit the pivoting movement of the drive arm 6 to the first wheel 5 and via the reduction gear to the cutting knife 3 until it has reached the cutting end position shown in FIG.
• a pivoting movement R the drive arm can be brought back into the open position shown in Figure 3, the cutting knife 3 is pivoted from the cutting knife remindschwenkein direction according to the invention, which is essentially formed by the coupling member 20, into the starting position.
• the drive arm 6 can also be moved from the operating position shown in FIG. 10 into the safekeeping position shown in FIG. 1.
• the reference number 30 shows an edge of a bearing plate 35.
• a cutting device which is characterized by a cutting knife-back pivoting device 20, 21, 22, 23, with which the pivoted from an initial position in a cutting end position cutting knife 3 can be brought back into the initial position by a pivoting movement.
• a cutting device which is characterized in that the
• Cutting knife-back pivoting device has a coupling member 20 with which the drive arm 6 is coupled to the cutting knife 3 with the formation of a pivot clearance.
• a cutting device which is characterized in that the coupling member 20 is a tension element which is fastened with a first fastening member 22 on the cutting knife 3 and a second fastening member 23 on the drive arm 6.
• a cutting device which is characterized in that the pivot clearance is formed by a fastening member 22, 23 movable in a first elongated hole 21 of the coupling member 20.
• a cutting device which is characterized in that the coupling member 20 is attached to a locking element 24 which couples the drive arm 6 during the pivoting movement H to a first wheel 5 of the reduction gear.
• a cutting device which is characterized in that the locking element 24 can be displaced in a second elongated hole 25 of the drive arm 6 between a power transmission position on a drive flank 27 of a drive gear wheel 26 and a release position.
• a cutting device which is characterized in that a rear flank 28 of the drive tooth 26 shifts the locking element 24 during a backward pivoting movement R from its power transmission position into its release position, in which it is in the backward pivoting movement R of the cutting knife 3 by means of the coupling member 20 remains dragging from the cutting end position to the starting position.
• a cutting device which is characterized in that the cutting knife 3 has, based on its pivot axis 2, a first arm, which has a cutting edge 3 'which dips into a gap 10 of the frame 1 during the cutting pivoting movement, and a second arm, the first arm has essentially diametrically opposite arm, which has a toothing 9, in which a toothing 8 of a second wheel 4 of the reduction gear engages.
• a cutting device which is characterized in that an output toothing of the first wheel 5 engages the same toothing 8 of the second wheel 4, which meshes with the toothing 9 of the cutting knife 3 and / or that the first wheel 5 is arranged between two drive wheels 29 and / or that the swivel angle of the cutting knife 3 is swivel-limited by swivel limiting elements 31, 32 and / or that the locking element 24 can be displaced from the power transmission position into a release position so that the drive arm 6 can be brought into a parallel position to a carrier formed by the frame 1. All of the features disclosed are essential to the invention (individually, but also in combination with one another).
• the disclosure of the application hereby also includes the full content of the disclosure content of the associated / attached priority documents (copy of the previous application), also for the purpose of including features of these documents in the claims of the present application.
• the subclaims characterize, even without the features of a referenced claim, with their features independent inventive developments of the prior art, in particular in order to make divisional applications on the basis of these claims.
• the invention specified in each claim can additionally have one or more of the features provided in the above description, in particular provided with reference numbers and / or specified in the list of reference numbers.
• the invention also relates to design forms in which some of the features mentioned in the above description are not implemented, in particular if they are recognizable for the respective purpose or can be replaced by other technically equivalent means.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Knives (AREA)
• Control Of Cutting Processes (AREA)
• Nonmetal Cutting Devices (AREA)
• Shearing Machines (AREA)
• Harvester Elements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=70228015

Family Applications (1)

Country Status (6)

Families Citing this family (1)

Family Cites Families (24)

• 2019
  • 2019-04-02 DE DE102019108632.9A patent/DE102019108632A1/de active Pending
• 2020
  • 2020-04-02 WO PCT/EP2020/059335 patent/WO2020201397A1/de unknown
  • 2020-04-02 CA CA3141411A patent/CA3141411A1/en active Pending
  • 2020-04-02 EP EP20717810.4A patent/EP3946787A1/de active Pending
  • 2020-04-02 CN CN202080027344.5A patent/CN114206531B/zh active Active
  • 2020-04-02 US US17/623,827 patent/US11731301B2/en active Active

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