CN107186822B - The plank hacking device for preventing plank from sliding - Google Patents

The plank hacking device for preventing plank from sliding Download PDF

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Publication number
CN107186822B
CN107186822B CN201710289802.2A CN201710289802A CN107186822B CN 107186822 B CN107186822 B CN 107186822B CN 201710289802 A CN201710289802 A CN 201710289802A CN 107186822 B CN107186822 B CN 107186822B
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CN
China
Prior art keywords
plank
clamping piece
saw blade
conveyer belt
clamping
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CN201710289802.2A
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Chinese (zh)
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CN107186822A (en
Inventor
黄昭和
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CHONGQING YIJU DOOR Co Ltd
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CHONGQING YIJU DOOR Co Ltd
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Priority to CN201710289802.2A priority Critical patent/CN107186822B/en
Publication of CN107186822A publication Critical patent/CN107186822A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27BSAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/16Saw benches
    • B27B5/22Saw benches with non-feedable circular saw blade
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27BSAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B29/00Gripping, clamping, or holding devices for the trunk or log in saw mills or sawing machines; Travelling trunk or log carriages
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27BSAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B31/00Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines
    • B27B31/006Arrangements for conveying, loading, turning, adjusting, or discharging the log or timber, specially designed for saw mills or sawing machines with chains or belts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27BSAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29Details; Component parts; Accessories

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacture Of Wood Veneers (AREA)

Abstract

The present invention relates to a kind of timber processing apparatus, and in particular to a kind of timber hacking device.Including rack, saw blade, multiple clamping pieces, saw blade is fixed in the rack, rack is equipped with conveyer belt, clamping piece is fixed on a moving belt, clamping piece includes being separately positioned on conveyor belt two sides and the first clamping member being oppositely arranged and the second clamping piece, clamping piece is equipped with adsorbing mechanism, and adsorbing mechanism includes two suckers, extractor fan and cylinder, and two suckers are separately fixed in first clamping member and the second clamping piece;Extractor fan connecting sucker and cylinder slidably connect piston in cylinder, the piston rod for pushing clamping piece to be displaced outwardly are connected on the outside of piston, and piston rod is connected between first clamping member and the second clamping piece;Extractor fan is connected with stepper motor, and stepper motor is equipped with the control switch of control stepper motor rotation direction.This programme can effectively prevent saw blade to block and prevent plank from sliding.

Description

The plank hacking device for preventing plank from sliding
Technical field
The present invention relates to a kind of timber processing apparatus, and in particular to a kind of timber hacking device.
Background technique
Solid wood board currently on the market is usually to be classified according to the size of timber, and clamping plate then has different specifications, However when making door, the size and thickness of the plank needed on door all with the specification for the plank sold in the market difference, So needing according to actual needs to process plank, wherein just including that thicker plank is processed into relatively thin plank.
Existing slicer generally comprises motor, saw blade, fixing piece, and plank is fixed on fixing piece, is driven by motor Saw blade is mobile, and saw blade carries out hacking to plank.
As disclosed on January 21st, 2015 application No. is the Chinese patent of CN201410540227.5 disclose it is a kind of novel Plank Slicer structure, including workbench, workbench are equipped with baffle and the delivery wheel opposite with baffle, and delivery wheel is in vertical side To rotation axis is connected with, rotation axis is connected with motor, and the region between baffle and delivery wheel forms a plank feed track, Workbench is equipped with cooperation plank feed track and is used for the cutter device of cutting panels of wood, and baffle is located on workbench back to delivery wheel The region of side is equipped with stabilizing reinforcing plate arranged in parallel with baffle and with baffle interval setting, and baffle and stabilizing reinforcing plate are in Rectangular-shaped or square shape and by the opposite position of four corner areas be arranged fixed connecting rod be fixedly connected on one It rises, motor is laterally vacantly arranged and its machine shaft is horizontally disposed and is located at by vertical duction device with rotation axis Position above delivery wheel is attached, and casing is fixed equipped with installation in the outside of machine shaft, vertical duction device and rotation axis, Machine shaft and the conveying direction of plank feed track form an angle less than 90 degree, and it is defeated away from plank to install fixed casing Side and one end far from motor is sent to be fixed with suspension plate, horizontal direction, which is hinged with to be located at, in suspension plate installs fixed casing Away from plank feed track side and towards the connection buffer bar of motor, connects buffer bar and be equipped with close to the position of motor and delayed Flushing device is hinged on buffer unit across installing fixed casing and extend to the fixed casing of installation towards plank feed track side Bridging plate, one end towards plank feed track side of bridging plate is hinged on column, and column is fixed on the table.
When carrying out hacking to plank, plank is placed on the table, baffle and the fixed plank of delivery wheel, motor driven Delivery wheel rotation, delivery wheel move plank to saw blade side, and saw blade carries out hacking to plank.But this plank hacking knot Structure, baffle and delivery wheel are respectively positioned on charging side, furthermore without the device of other fixed planks, so working as the non-hacking portion of plank When point being shorter in length than the distance between delivery wheel and saw blade, plank can not be fixed, and can not continue to process plank at this time, One piece of plank can not be cut open completely.In addition, delivery wheel transmits plank to saw blade side by the stiction between plank, However delivery wheel is cylinder, the contact between delivery wheel and plank contacts for line, and contact area is small, so delivery wheel and plank Between can occur it is opposite slide, influence the charging of plank.In addition, in saw blade cutting panels of wood, delivery wheel squeezes plank, plank by It deforms after to extruding, the gap cut narrows, and the frictional force between plank and saw blade increases, so the resistance of saw blade motion Power increases, and the space of saw blade motion becomes smaller, and saw blade can be blocked by plank, and saw blade can not continue cutting panels of wood.
Summary of the invention
The purpose of the present invention is to provide a kind of plank hacking devices for preventing saw blade from blocking, preventing plank from sliding.
In order to achieve the above objectives, the technical scheme is that preventing the plank hacking device of plank sliding, including machine Frame, saw blade, multiple clamping pieces, saw blade are arranged in the rack, and rack is equipped with conveyer belt, and clamping piece is fixed on conveyer belt On, clamping piece includes being separately positioned on conveyor belt two sides and the first clamping member being oppositely arranged and the second clamping piece, on clamping piece Equipped with adsorbing mechanism, adsorbing mechanism includes two suckers, extractor fan, cylinders, and two suckers are separately fixed at first clamping member On the second clamping piece;Extractor fan connecting sucker and cylinder slidably connect piston in cylinder, are fixedly connected on the outside of piston Piston rod for pushing clamping piece to be displaced outwardly, piston rod are connected between first clamping member and the second clamping piece;Exhausting dress It sets and is connected with stepper motor, stepper motor is equipped with the control switch of control stepper motor rotation direction.
When carrying out hacking processing to plank, plank is placed between first clamping member and the second clamping piece, sucker paster In plank two sides, stepper motor is opened, when stepper motor rotates forward, stepper motor drives extractor fan, and extractor fan will be in sucker Air be sucked out, sucker is inhaled on plank, and extractor fan will be sent into cylinder from the air that is sucked out in sucker, and inner pressure of air cylinder increases Greatly, piston moves outward, and the piston rod being connected between piston and clamping piece pushes clamping piece in the direction away from each other, The sucker for being adsorbed on plank two sides pulls plank two sides towards two sides.When saw blade cuts plank, sucker will be into two pieces Wood chip is pulled to conveyor belt two sides, and between wood chip, the space of saw blade cut place becomes larger.
After completing the hacking of plank, control switch, stepper motor reversion are pressed, air extractor takes out the air in cylinder It is sent in sucker out, sucker inflation falls off from plank, and clamping piece loosens the fixation to plank, can be by plank from conveyer belt On remove, that is, complete hacking to plank.Air in cylinder is extracted, and air pressure becomes smaller in cylinder, and piston uses inwardly, with The clamping piece of piston rod connection is pulled to direction close to each other, and clamping piece is kept in the center.Later, clamping piece is brought back to transmission Initial position is returned to, is repeated the above steps.
Since clamping piece is clamped in always as plank moves on plank, so during entire hacking, plank quilt Clamping piece is fixed, and plank will not move, and plank can be cut open completely.In addition, sucker is adsorbed on plank completely, inhale Contact area between disk and plank is big, and it is seamless between sucker and plank will not be mutually shifted, so sucker can Fix plank completely.In addition, piston rod pushes first clamping member and the second clamping piece to direction is located remotely from each other, the first folder The distance between gripping member and the second clamping piece increase, and sucker also pulls plank to two sides, make the sky between the two panels wood chip opened Gap increases, and saw blade can be effectively prevented and be stuck, and can also reduce two panels plank to the extruding force of saw blade, can reduce saw blade with Frictional force between wood chip, it is possible to which the abrasion for reducing saw blade extends the service life of saw blade.And when the air quilt in sucker When exhaustion, then stop inflating into cylinder, so the limited length that piston rod stretches out, can be effectively prevented first clamping member and the Two clamping pieces deform wood chip.
Preferred embodiment one, as the further improvement to base case, rack both ends, which are equipped with, presses the control switch Protrusion.When plank is cut open completely, clamping piece moves to raised position, and protrusion presses control switch, stepper motor Driving direction inverts, and air extractor is inflated into sucker, and sucker decontrols plank, can take plank from conveyer belt at this time Under.At the same time, air extractor extracts cylinder air out, and piston rod drives first clamping member and the second clamping piece to opposite side To movement, the distance between first clamping member and the second clamping piece reduce, and clamping piece sets back.Protrusion can be to avoid artificial hand Dynamic presses control switch, on the one hand reduces the workload of operator, on the other hand can also realize Automatic-clamping and loosen, Avoid operator from judging inaccuracy and caused by it is too early or excessively complete loosen plank.
Preferred embodiment two, as the further improvement to preferred embodiment one, sucker outer rim is equipped with soft rubber layer.It is inhaling When disk is attached on plank, rubber layer can make do not have gap between sucker and plank, guarantee extractor fan by the air in sucker There is no extraneous air to enter in sucker when extraction by gap, it is possible to which the normal use for guaranteeing sucker enables plank It is fixed, saw blade is more enough to carry out hacking to plank.
Preferred embodiment three, as the further improvement to preferred embodiment two, piston outer rim is equipped with sealing ring.Entirely processing In the process, air extractor can guarantee the air-tightness of cylinder, prevent air extractor from inflating to cylinder charge and pumping, sealing ring Or gas leakage when pumping, guarantee that first clamping member and the second clamping piece can be strutted normally and it made to restore former by piston rod Position makes first clamping member and the second clamping piece can be realized the working space for increasing saw blade, extends the effect of the service life of saw blade Fruit.
Preferred embodiment four, as the further improvement to preferred embodiment three, saw blade is saw blade.The volume of saw blade and thickness compared with It is small, first clamping member and the second clamping piece only need to pull open lesser gap i.e. and can guarantee plank will not clamping saw blade, so can To avoid wood chip from deforming completely.
Preferred embodiment five, as the further improvement to preferred embodiment four, conveyer belt includes that the first conveyer belt and second pass Band is sent, there are the gaps that the receiving saw blade passes through between first conveyer belt and the second conveyer belt.Saw blade is in vertical direction Movement, there are the gaps of saw blade motion to hurt conveyer belt to avoid saw blade for transmission belt.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is the structural schematic diagram of embodiment 1;
Fig. 2 is the structural schematic diagram of embodiment 2;
Fig. 3 is the partial sectional view of Fig. 2.
Specific embodiment
Appended drawing reference: rack 1, the second clamping piece 3, cylinder 4, the first cylinder 41, the second cylinder 42, is taken out at first clamping member 2 Wind apparatus 5, the first blower 51, stepper motor 6, the first stepper motor 61, sucker 7, rubber layer 8, sliding slot 9, sliding block 10, piston 11, first piston 111, sealing ring 12, piston rod 13, First piston bar 131, second piston bar 132, conveyer belt 14, first pass Send band 141, the second conveyer belt 142, upper belt-wheel 15, lower belt wheel 16, saw blade 17.
Embodiment 1
Such as Fig. 1, the plank hacking device for preventing plank from sliding, including rack 1, saw blade 17, clamping piece, saw blade 17 is along plank Feedstock direction is vertically arranged in rack 1, and first motor drives saw blade 17 to rotate.It is additionally provided with conveyer belt 14 in rack 1, transmits Band 14 is located at 17 downside of saw blade, and the second motor is stepper motor, and the second motor driven conveyer belt 14,1 both ends of rack are respectively equipped with The reversal switch of the second direction of motor rotation is controlled, first clamping member 2 can press reversal switch, 14 counter motion of conveyer belt. It is set on conveyer belt 14 there are three clamping piece, clamping piece is fixed is welded with sliding block 10 on a conveyor belt 14, on clamping piece, in rack 1 It is provided with the sliding slot 9 for the clamping piece that is slidably connected, sliding block 10 is slidably connected in sliding slot 9.Clamping piece includes being located at 14 left side of conveyer belt First clamping member 2 of side and the second clamping piece 3 on the right side of conveyer belt, first clamping member 2 and 3 upper end of the second clamping piece are opposite Direction is provided with sucker 7, and it is the rubber layer 8 of soft rubber that being glued on the outside of sucker 7, which has material,;First clamping member 2 and the second folder Hollow pipeline is equipped in gripping member 3, hollow pipeline is connected to space in sucker 7;Cylinder 4 is additionally provided on the downside of conveyer belt 14, cylinder 4 is left Right two sides are equipped with piston 11, and the splicing of 11 outer rim of piston has sealing ring 12, piston rod 13, piston rod are respectively connected on the outside of piston 11 13 weld with the lower end of first clamping member 2 and the second clamping piece 3 respectively, and 4 upside of cylinder is fixed with blower 5 and stepping electricity with bolt Machine 6, stepper motor 6 drive blower 5, and 5 one end of blower is connected to the hollow pipeline of clamping piece, between the other end and two-piston 11 4 side wall of cylinder is connected to, and the control switch of control stepper motor driving direction is provided on the upside of stepper motor 6,1 both ends of rack are leaned on Nearly stepper motor side is equipped with the protrusion for pressing control switch.
In use, opening stepper motor 6, stepper motor 6 drives blower 5;Open first motor and the second motor, the first electricity Machine drives saw blade 17 to rotate, the movement of the second motor driven conveyer belt 14.Plank is placed on first clamping member 2 and the second clamping piece Between 3, sucker 7 is attached to plank two sides, and plank travels forward with conveyer belt 14, and control switch is pressed by protrusion, and blower 5 is by sucker Air in 7 is sucked out, and sucker 7 is inhaled on plank, and blower 5 will be sent into cylinder 4 from the air being sucked out in sucker 7,4 internal pressure of cylinder Power increases, and two sides move two-piston 11 to the left and right respectively, and the piston rod 13 in left side pushes first clamping member 2 to the left, right side Piston rod 13 second clamping piece 3 is pushed to the right, so being adsorbed on the suckers 7 of plank two sides for plank two sides to the left and right Two sides pull.When saw blade 17 cuts plank, sucker 7 pulls wood chip into two pieces to 14 two sides of conveyer belt, between wood chip, The space of 17 cut place of saw blade becomes larger.After completing the hacking of plank, control switch encounters the protrusion of 1 discharge end of rack, protrusion Control switch is pressed, the driving direction of stepper motor 6 inverts, and the air extraction in cylinder 4 is sent to sucker 7 by blower 5 In, the inflation of sucker 7 falls off from plank, and clamping piece loosens the fixation to plank, can take plank from conveyer belt 14 at this time Under, then complete the hacking to plank.At the same time, the air in cylinder 4 is extracted, and air pressure becomes smaller in cylinder 4, and piston 11 is inside Side uses, and the clamping piece connecting with piston rod 13 is pulled to direction close to each other, and clamping piece is kept in the center.Then, the first folder Gripping member 2 presses reversal switch, 14 counter motion of conveyer belt, and clamping piece is moved to conveyer belt 14 from plank position is decontroled again Fixed plank position, repeats the above steps.
Embodiment 2
Such as Fig. 2, Fig. 3, difference from Example 1 is, saw blade 17 is saw blade, and conveyer belt is respectively equipped with two sides up and down Belt wheel 15 and lower belt wheel 16, saw blade 17 are arranged between upper lower belt wheel, drive saw blade 17 to move by upper lower belt wheel, first motor is driven Dynamic lower belt wheel 16 rotates.Conveyer belt is divided into first conveyer belt 141 in left side and second conveyer belt 142 on right side, the first conveyer belt 141 and second there are the gaps for accommodating saw blade 17 and moving between conveyer belt 142.The first folder is provided on the left of first conveyer belt 141 Gripping member 2 is provided with the second clamping piece 3 on the right side of second conveyer belt 142.On the downside of first conveyer belt 141 be equipped with the first cylinder 41, first It is welded on the right side of cylinder 41 in rack 1, first piston 111 is slidably connected in the first cylinder 41, is welded on the left of first piston 111 There is a First piston bar 131, First piston bar 131 is welded on 2 lower end of first clamping member, is fixed with bolt on the first cylinder 41 One stepper motor 61 and the first blower 51, the first blower 51 connect the sucker 7 of the first cylinder 41 and 2 upper end of first clamping member, the One stepper motor 61 drives the first blower 51, and control 61 driving direction of the first stepper motor is equipped on the upside of the first stepper motor 61 Control switch.It is equipped with the second cylinder 42 on the downside of second conveyer belt 142, is welded in rack 1 on the left of the second cylinder 42, second Second piston is slidably connected in cylinder 42, second piston bar 132 is welded on the right side of second piston, and second piston bar 132 is welded Second stepper motor and the second blower, the connection of the second blower are fixed with bolt on 3 lower end of the second clamping piece, the second cylinder 42 The sucker 7 of second cylinder and the second clamping piece upper end, second stepper motor drive the second blower, are equipped on the upside of second stepper motor Control the control switch of second stepper motor driving direction.Side frame blowing and discharge end under first conveyer belt and the second conveyer belt Close stepper motor side be equipped with the protrusion for pressing control switch.
In use, difference from Example 1 is, the first stepper motor and second stepper motor respectively drive the first wind Air in sucker 7 in first clamping member 2 is pumped into the first cylinder 41 by machine 51 and the second blower, the first blower 51, and first Piston rod 131 pushes first clamping member 2 to the left;Air in sucker 7 on second clamping piece 3 is pumped into second by the second blower In cylinder 42, second piston bar push to the right the second clamping piece 3, such first clamping member 2 and the second clamping piece 3 by plank to The left and right sides pulls.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those skilled in the art, Without departing from the inventive concept of the premise, several modifications and improvements can also be made, these also should be considered as guarantor of the invention Range is protected, these all will not influence the effect and patent practicability that the present invention is implemented.The present invention omits the technology of description, shape Shape, construction portion are well-known technique.

Claims (6)

1. the plank hacking device for preventing plank from sliding, including rack (1), saw blade (17), multiple clamping pieces, which is characterized in that The saw blade (17) is arranged on the rack (1), and the rack (1) is equipped with conveyer belt (14), and the clamping piece is fixed on On conveyer belt (14), the clamping piece includes the first clamping member (2) for being separately positioned on conveyer belt (14) two sides and being oppositely arranged With the second clamping piece (3), the clamping piece is equipped with adsorbing mechanism, and the adsorbing mechanism includes two suckers (7), extractor fans (5), cylinder (4), described two suckers (7) are separately fixed in described first clamping member (2) and the second clamping piece (3);It is described Extractor fan (5) connecting sucker (7) and cylinder (4), sucker paster is in plank two sides and inhales on plank;It is sliding in the cylinder (4) It is dynamic to be connected with piston (11), the piston rod for pushing clamping piece to be displaced outwardly is fixedly connected on the outside of the piston (11) (13), the piston rod (13) is connected between described first clamping member (2) and the second clamping piece (3), and piston rod will be for that will press from both sides Gripping member pushes in the direction away from each other, and sucker pulls plank two sides towards two sides, between wood chip, the space of saw blade cut place Become larger;The extractor fan (5) is connected with stepper motor (6), and the stepper motor (6), which is equipped with, controls the stepper motor (6) control switch of rotation direction.
2. the plank hacking device according to claim 1 for preventing plank from sliding, it is characterised in that: the rack (1) two End is equipped with the protrusion for pressing the control switch.
3. the plank hacking device according to claim 2 for preventing plank from sliding, it is characterised in that: the sucker (7) is outside Edge is equipped with soft rubber layer (8).
4. the plank hacking device according to claim 3 for preventing plank from sliding, it is characterised in that: the piston (11) is outside Edge is equipped with sealing ring (12).
5. the plank hacking device according to claim 4 for preventing plank from sliding, it is characterised in that: the saw blade (17) is Saw blade.
6. the plank hacking device according to claim 5 for preventing plank from sliding, it is characterised in that: the conveyer belt (14) Including the first conveyer belt (141) and the second conveyer belt (142), between first conveyer belt (141) and the second conveyer belt (142) There are the gaps that the receiving saw blade passes through.
CN201710289802.2A 2017-04-27 2017-04-27 The plank hacking device for preventing plank from sliding Active CN107186822B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710289802.2A CN107186822B (en) 2017-04-27 2017-04-27 The plank hacking device for preventing plank from sliding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710289802.2A CN107186822B (en) 2017-04-27 2017-04-27 The plank hacking device for preventing plank from sliding

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CN107186822A CN107186822A (en) 2017-09-22
CN107186822B true CN107186822B (en) 2019-10-11

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109318305B (en) * 2018-09-12 2021-04-13 南京理工大学 Cutting device convenient to wood working

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2261956A1 (en) * 1974-02-27 1975-09-19 Joulin Michel Automatic sorting of sawn planks from same log - conveyed to storage area, lined up for stacking in sequence
DE19637954A1 (en) * 1996-09-18 1998-03-19 Ima Maschinenfabriken Klessmann Gmbh Machine tool with sawing device
CN102615682A (en) * 2012-03-30 2012-08-01 苏州凯尔博精密机械有限公司 Hollow plate edge bonding machine workbench
CN104290143B (en) * 2014-10-14 2016-03-02 浙江安吉双虎竹木业有限公司 A kind of novel plank Slicer structure
CN204624066U (en) * 2015-03-18 2015-09-09 安徽泰诺塑胶有限公司 A kind of device for labeling of plastic cup
CN104708701A (en) * 2015-03-24 2015-06-17 河北联合大学 Cutting edge-sealing all-in-one machine
CN205167100U (en) * 2015-12-08 2016-04-20 重庆美雅门业有限公司 Suit pupil produce with machine of saw cutting

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