CN107097291B - A kind of paper perforating mold piercing knife - Google Patents
A kind of paper perforating mold piercing knife Download PDFInfo
- Publication number
- CN107097291B CN107097291B CN201710528253.XA CN201710528253A CN107097291B CN 107097291 B CN107097291 B CN 107097291B CN 201710528253 A CN201710528253 A CN 201710528253A CN 107097291 B CN107097291 B CN 107097291B
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- Prior art keywords
- cutter
- head
- punching
- cutter head
- spring
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
- B26F1/02—Perforating by punching, e.g. with relatively-reciprocating punch and bed
- B26F1/14—Punching tools; Punching dies
-
- 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
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/18—Means for removing cut-out material or waste
- B26D7/1845—Means for removing cut-out material or waste by non mechanical means
- B26D7/1854—Means for removing cut-out material or waste by non mechanical means by air under pressure
-
- 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
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
- B26D7/2614—Means for mounting the cutting member
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- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
Abstract
The invention discloses a kind of paper perforating mold piercing knifes, including punching cutter ontology, groove, cutter head, increment, bits blower, pressing plate, second spring, baffle, tight screw rod, mounting head, installation thread head, limit hole, cutter head mounting screw end and cutter head to install nut groove；The bits blower is mounted in punching cutter main body and for blowing away paper scrap waste material in the middle part of punching cutter main body.Meanwhile the present invention can also make cutter Rapid reset, while while also can be reduced punching makes an uproar sonic propagation, the interior design of cutter head makes staff be convenient for changing cutter head, and the design is not only simple in structure, easy to use, energy conservation and environmental protection, and improve the efficiency of workpiece processing tool.
Description
Technical field
The present invention relates to piercing knife technical field of structures, specially a kind of paper perforating mold piercing knife.
Background technique
Stamping die is that material (metal or nonmetallic) is processed into part (or semi-finished product) in Cold Press Working
A kind of special process equipment, referred to as cold punching die (being commonly called as cold-punching mould), punching press are at room temperature using being mounted on press machine
Mold to material apply pressure, make its generate separation or plastic deformation, thus obtain needed for part a kind of pressure processing side
Method, manufacture stamping die material have steel, hard alloy, steel bonded carbide, zinc-containing alloy, low-melting alloy, aluminium bronze,
High molecular material etc., existing paper hole class formation is processed in the market, now needs first to analyze product structure, listing needs processing department
Position, selective positioning and empty avoiding position, select the punching machine of Reasonable Parameters, are designed stamping die, punching die is that one kind is used to
To the stamping die that workpiece is punched out, existing stamping die, including upper mold group and lower die group, wherein upper mold group includes upper mold
Seat and punching cutter, lower die holder include lower die holder and cavity plate, and upper die holder downlink drives punching cutter punching press to be placed on recessed when work
Workpiece on mould upper surface, to complete punching press.
But not only structure is complicated for piercing knife structure currently on the market, but also has a single function, and is not provided with pressing plate, no
It can give workpieces processing one elastic force by pressing plate, make cutter Rapid reset, sonic propagation of making an uproar when not can be reduced punching, meanwhile,
Some paper sheets punching die in the market does not have paper scrap cleaning mechanism, is easy to be stuck in cutter interior in punching paper scrap waste material, influences
Punching quality and efficiency, and Some paper sheets piercing die has paper scrap cleaning mechanism, but need external dust catcher and air blower etc.
Device more consumes energy and occupied area is larger；The feature that existing cutter does not have replacement cutter head simultaneously needs if tool wear
More fall entire cutter, results in waste of resources.
Summary of the invention
The present invention provides a kind of paper perforating mold piercing knife, can effectively solve mentioned above in the background art ask
Topic.
To achieve the above object, the invention provides the following technical scheme: a kind of paper perforating mold piercing knife, including punching
Spot facing cutter ontology, groove, cutter head, increment, bits blower, pressing plate, second spring, baffle, tight screw rod, mounting head, installation spiral shell
Line head, limit hole, cutter head mounting screw end and cutter head install nut groove；Being internally provided with for punching cutter ontology puts rod cavity
With put blister cavities, put blister cavities and be located at punching cutter body upper part, put rod cavity and be located at punching cutter body lower part, put and rod cavity and put blister cavities
Between be provided with every position plate, it is described every being provided with cylindrical rodding eye on the plate of position.
Punching cutter ontology upper end is provided with mounting head, and the lower end of punching cutter ontology is provided with cutter head, the punching
The side wall setting of cutter body is fluted, and the junction of punching cutter ontology and cutter head is provided with cutter head mounting screw end, institute
That states mounting head is internally provided with installation thread head, and one end insertion of mounting head is provided with tight screw rod, the installation thread head
It is internally provided with limit hole, the inside of the cutter head is provided with cutter head installation nut at the external position of cutter head mounting screw end
Slot, and the lower end of cutter head is provided with increment, the baffle weldering is connected in punching cutter body exterior at one end position of mounting head,
Baffle puts blister cavities for closing, and after following air bags are placed into blister cavities by staff, baffle be can weld in punching cutter
Blister cavities is put with closing on ontology, and the lower end of baffle is provided with second spring, one end of the second spring is provided with pressing plate.
The bits blower includes push rod, pressing lever, the first spring, air bag and steam hose, and the push rod can be slided
Dynamic insertion punching cutter ontology is put in rod cavity, push rod include long right cylindrical upper pushed section and flat-disk shape under
Pushed section, multiple ventholes are evenly arranged on lower pushed section, and upper pushed section is provided through the perpendicular through-hole for being connected to the lower each venthole in pushed section；
The design of push rod is so that paper scrap waste material is not easily accessible punching cutter body interior；Meanwhile the design of the lower multiple ventholes in pushed section, make
It of the invention can must reversely be dried, will not be designed because of venthole very few with the paper scrap waste material that more large area crosses meeting to punching
And the case where paper scrap waste material can not being blown away, blowing design is so that waste material is more not easily accessible punching cutter body interior.
The pressing lever upper end is slidably run through every position plate, and pressing lever lower end is fixedly connected with push rod, and described first
Spring surrounds on pressing lever, and the first spring one end is fixedly connected with every position plate, and the first spring other end is fixedly connected with push rod, and first
The design of spring enables push rod Rapid reset unde the action of the restoring force of the spring；The air bag is mounted on punching cutter ontology
Put in blister cavities, when the first spring is in relaxed state, pressing lever top is in contact with air bag；Described steam hose one end
Communicated air bags, the steam hose other end are connected to the perpendicular through-hole of push rod；When work, when the objects such as paper scrap waste material are in punching cutter ontology
Aggregation in the middle part of lower end and when push rod is moved upwards, then extruding gasbag due to moving upwards for push rod, so that in air bag
Gas from the venthole that steam hose is passed to lower pushed section, paper scrap waste material to be blowed, so that paper scrap waste material be blown
It walks, when being punched out to paper, paper scrap waste material can be blown away the present invention by the mechanism of punching cutter body interior, and nothing
It needs separately to set the power-equipments such as dust catcher, air blower and other external large and medium-sized mechanisms again, to greatly save external dynamic
Power loss, has saved the energy, and reduce the occupied space of paper perforating mold.
Preferably, give pressing plate one downward elastic force by second spring to realize, thus make cutter Rapid reset,
Baffle is fixedly connected with pressing plate by second spring.
Preferably, in order to avoid there are vacuum between cutter and workpiece, punching difficulty is reduced, the present invention is designed by recessed
Slot, and there are three groove is arranged altogether.
Preferably, the air bag upper end, which is connected in, puts blister cavities side wall, and air bag lower end is connected on pressing lever, thus when pressing
Compression bar under the action of the spring Rapid reset when, air bag can pressing lever pulling under Fast Restoration, convenient in next step blowing work
Development.
Preferably, in order to keep cutter head more hard, service life is more long, and cutter head is a kind of component of wolfram steel material.
Compared with prior art, beneficial effects of the present invention:
(1) structure of the invention is scientific and reasonable, safe and convenient to use, is provided with pressing plate, can be by pressing plate to processing
One elastic force of workpiece, sonic propagation of making an uproar when making cutter Rapid reset, while also can be reduced punching.
(2) bottom end of cutter of the present invention is provided with cutter head mounting screw end, and cutter head is internally provided with cutter head installation nut
Slot, staff are convenient for changing cutter head, avoid because of tool bit abrasion, need replacing entire cutter, and what is resulted in waste of resources asks
Topic.
(3) top of cutter of the present invention is provided with installation thread head and tight screw rod, easy for removal and installation.
(4) bits blower of the invention is designed in the inside of cutter, and without using external dust collection equipment and air blast
Equipment need to only can be realized by the movement of push rod itself and blow bits, and waste material is easy to be stuck in cutter when on the one hand solving punching
Portion and the problem of influence punching quality and efficiency, on the other hand greatly saved external impetus loss, saved the energy, and
Reduce the occupied space of paper perforating mold.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.
In the accompanying drawings:
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is cross-sectional view of the invention；
Fig. 3 is the structural schematic diagram at cutter head mounting screw of the present invention end；
Fig. 4 is the structural schematic diagram of cutter head of the present invention；
Figure label: 1, punching cutter ontology；2, groove；3, cutter head；4, increment；5, bits blower；7, pressing plate；8,
Two springs；9, baffle；10, tight screw rod；11, mounting head；12, thread head is installed；13, limit hole；16, cutter head mounting screw end；
17, cutter head installs nut groove；101, rod cavity is put；102, blister cavities is put；103, every position plate；51, push rod；52, pressing lever；53, first
Spring；54, air bag；55, steam hose；511, upper pushed section；512, lower pushed section.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Embodiment: as shown in Figs 1-4, the present invention provides a kind of technical solution, a kind of paper perforating mold piercing knife, packet
Include punching cutter ontology 1, groove 2, cutter head 3, increment 4, bits blower 5, pressing plate 7, second spring 8, baffle 9, tight screw rod 10,
Mounting head 11, installation thread head 12, limit hole 13, cutter head mounting screw end 16 and cutter head install nut groove 17；
Being internally provided with for the punching cutter ontology 1 puts rod cavity 101 and puts blister cavities 102, puts blister cavities 102 and is located at piercing knife
Have 1 top of ontology, put rod cavity 101 and be located at punching cutter body lower part 1, puts rod cavity 101 and put and be provided between blister cavities 102 every position
Plate 103, it is described every being provided with cylindrical rodding eye on position plate 103.
Punching cutter ontology upper end is provided with mounting head 11, and the lower end of punching cutter ontology 1 is provided with cutter head 3, described
The side wall setting fluted 2 of punching cutter ontology 1, and the junction of punching cutter ontology 1 and cutter head 3 is provided with cutter head installation spiral shell
End 16 is followed closely, the mounting head 11 is internally provided with installation thread head 12, and one end insertion of mounting head 11 is provided with tight screw rod
10, the installation thread head 12 is internally provided with limit hole 13, and the inside of the cutter head 3 is outside cutter head mounting screw end 16
Cutter head installation nut groove 17 is provided at position, and the lower end of cutter head 3 is provided with increment 4, the weldering of baffle 9 is connected in punching cutter
For 1 outside of ontology at 11 1 end position of mounting head, baffle 9 puts blister cavities 102 for closing, and puts following air bags in staff
It sets after putting blister cavities 102, baffle 9, which can weld, puts blister cavities 102 on punching cutter ontology 1 with closing, and the lower end of baffle 9 is set
It is equipped with second spring 8, one end of the second spring 8 is provided with pressing plate 7.
The bits blower 5 includes push rod 51, pressing lever 52, the first spring 53, air bag 54 and steam hose 55, described
Push rod 51 slidably insertion punching cutter ontology 1 is put in rod cavity 101, push rod 51 includes the upper pushed section of long right cylindrical
511 and flat-disk shape lower pushed section 512, be evenly arranged with multiple ventholes on lower pushed section 512, upper pushed section 511 is through setting
It is equipped with the perpendicular through-hole for being connected to the lower each venthole in pushed section 512；The design of push rod 51 is so that paper scrap waste material is not easily accessible punching cutter sheet
Inside body 1；Meanwhile the design of a venthole in lower pushed section more than 512, allow the invention to the paper for crossing meeting to punching with more large area
Bits waste material is reversely dried, will not be designed because of venthole it is very few and the case where paper scrap waste material can not be blown away, blowing designs
So that waste material is more not easily accessible inside punching cutter ontology 1.
52 upper end of pressing lever is slidably run through every position plate 103, and 52 lower end of pressing lever is fixedly connected with push rod 51, institute
The first spring 53 stated surrounds on pressing lever 52, and 53 one end of the first spring is fixedly connected with every position plate 103, and the first spring 53 is another
End is fixedly connected with push rod 51, and the design of the first spring enables push rod Rapid reset unde the action of the restoring force of the spring；Described
Air bag 54 is mounted on the putting in blister cavities 102 of punching cutter ontology, when the first spring 53 is in relaxed state, 52 top of pressing lever
It is in contact with air bag 54；55 one end communicated air bags 54 of steam hose, 55 other end of steam hose are connected to the perpendicular of push rod 51
Through-hole；When work, when the objects such as paper scrap waste material are assembled in the middle part of 1 lower end of punching cutter ontology push rod 51 is moved upwards
When, then moving upwards due to extruding gasbag 54 because of push rod 51, so that the gas in air bag 54 is passed to from steam hose 55
At the venthole of lower pushed section 512, paper scrap waste material to be blowed, so that paper scrap waste material be blown away, the present invention to paper into
When row punching, paper scrap waste material can be blown away by the mechanism inside punching cutter ontology 1, without separately setting dust catcher, drum again
The power-equipments such as blower and other external large and medium-sized mechanisms have saved the energy to greatly save external impetus loss,
And reduce the occupied space of paper perforating mold.
Preferably, in order to realize through second spring 8 to 7 one downward elastic force of pressing plate, so that cutter be made to reply immediately fastly
Position, baffle 9 are fixedly connected with pressing plate 7 by second spring 8.
Preferably, in order to avoid there are vacuum between cutter and workpiece, punching difficulty is reduced, the present invention is designed by recessed
Slot, and there are three the total settings of groove 2.
Preferably, 54 upper end of air bag, which is connected in, puts 102 side wall of blister cavities, and 54 lower end of air bag is connected in pressing lever 52
On, thus when pressing lever Rapid reset under the action of the spring, air bag can under pressing lever pulling Fast Restoration, convenient for next
The development of step blowing work.
Preferably, in order to keep cutter head 3 more hard, service life is more long, and cutter head 3 is a kind of component of wolfram steel material.
The working principle of the invention and process for using: the upper end of punching cutter ontology 1 is provided with mounting head 11, and piercing knife
The lower end of tool ontology 1 is provided with cutter head 3, and cutter head 3 is that a kind of component of wolfram steel material in order to keep cutter head 3 more hard uses the longevity
It orders more long；The side wall setting fluted 2 of punching cutter ontology 1, there are three the total settings of groove 2, in order to avoid cutter and workpiece
Between there are vacuum, reduce punching difficulty；And the junction of punching cutter ontology 1 and cutter head 3 is provided with cutter head mounting screw end
16, thread head 12 is installed in being internally provided with for mounting head 11, easy for removal and installation, and one end insertion of mounting head 11 is provided with
Tight screw rod 10, installation thread head 12 are internally provided with limit hole 13, can be consolidated by the inside that tight screw rod 10 is inserted into limit hole 13
Fixed, baffle 9 is wrapped in 1 outside of punching cutter ontology at 11 1 end position of mounting head, and the lower end of baffle 9 is provided with second
Spring 8, one end of second spring 8 are provided with pressing plate 7, and the bottom end of the design cutter is provided with cutter head mounting screw end 16, knife
First 3 cutter head that is internally provided with installs nut groove 17, and staff is convenient for changing cutter head 3, avoids because cutter head 3 is worn, needs
Entire cutter is replaced, the problem of resulting in waste of resources, is provided with pressing plate 7, workpieces processing one can be given by pressing plate 7
Elastic force makes cutter Rapid reset, while while also can be reduced punching makes an uproar sonic propagation.When the objects such as paper scrap waste material are in punching cutter sheet
Aggregation in the middle part of 1 lower end of body and when push rod 51 is moved upwards, then moving upwards due to extruding gasbag 54 because of push rod 51, to make
The gas in air bag 54 is obtained from the venthole that steam hose 55 is passed to lower pushed section 512, paper scrap waste material to be blowed, from
And paper scrap waste material is blown away.The design is not only simple in structure, easy to use, energy conservation and environmental protection, and improves workpiece processing tool
Efficiency.
Finally, it should be noted that being not intended to restrict the invention the foregoing is merely preferred embodiment of the invention, to the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, for those skilled in the art, still can be with
It modifies the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.It is all
Within the spirit and principles in the present invention, any modification, equivalent replacement, improvement and so on should be included in guarantor of the invention
Within the scope of shield.
Claims (5)
1. a kind of paper perforating mold piercing knife, it is characterised in that: including punching cutter ontology (1), groove (2), cutter head
(3), increment (4), bits blower (5), pressing plate (7), second spring (8), baffle (9), tight screw rod (10), mounting head (11),
Thread head (12), limit hole (13), cutter head mounting screw end (16) and cutter head installation nut groove (17) are installed；
Being internally provided with for the punching cutter ontology (1) is put rod cavity (101) and is put blister cavities (102), puts blister cavities (102) and is located at punching
Spot facing cutter ontology (1) top puts rod cavity (101) and is located at punching cutter ontology (1) lower part, puts rod cavity (101) and puts blister cavities (102)
Between be provided with every position plate (103), it is described every being provided with cylindrical rodding eye on position plate (103)；
Punching cutter ontology upper end is provided with mounting head (11), and the lower end of punching cutter ontology (1) is provided with cutter head (3), institute
Fluted (2) are arranged in the side wall for stating punching cutter ontology (1), and punching cutter ontology (1) and the junction of cutter head (3) are provided with
Cutter head mounting screw end (16), the mounting head (11) are internally provided with installation thread head (12), and the one of mounting head (11)
End insertion be provided with tight screw rod (10), the installation thread head (12) is internally provided with limit hole (13), the cutter head (3) it is interior
Portion is provided with cutter head installation nut groove (17) at cutter head mounting screw end (16) external position, and the lower end of cutter head (3) is set
It is equipped with increment (4), it is external at (11) one end position of mounting head that baffle (9) weldering is connected in punching cutter ontology (1), and keeps off
The lower end of plate (9) is provided with second spring (8), and one end of the second spring (8) is provided with pressing plate (7)；
The bits blower (5) includes push rod (51), pressing lever (52), the first spring (53), air bag (54) and steam hose
(55), the push rod (51) slidably put in rod cavity (101) by insertion punching cutter ontology (1), and push rod (51) includes length
The upper pushed section (511) of right cylindrical and the lower pushed section (512) of flat-disk shape are evenly arranged on lower pushed section (512) multiple
Venthole, upper pushed section (511) are provided through the perpendicular through-hole for being connected to lower pushed section (512) each venthole；
Described pressing lever (52) upper end is slidably run through every position plate (103), and pressing lever (52) lower end is mutually solid with push rod (51)
Even, first spring (53) surrounds on pressing lever (52), and the first spring (53) one end is fixedly connected with every position plate (103),
First spring (53) other end is fixedly connected with push rod (51)；What the air bag (54) was mounted on punching cutter ontology puts blister cavities
(102) in, when the first spring (53) is in relaxed state, pressing lever (52) top is in contact with air bag (54)；Described is logical
Gas hose (55) one end communicated air bags (54), steam hose (55) other end are connected to the perpendicular through-hole of push rod (51).
2. a kind of paper perforating mold piercing knife according to claim 1, it is characterised in that: the baffle (9) with press
Pressing plate (7) is fixedly connected by second spring (8).
3. a kind of paper perforating mold piercing knife according to claim 1, it is characterised in that: the groove (2) sets altogether
There are three setting.
4. a kind of paper perforating mold piercing knife according to claim 1, it is characterised in that: on the air bag (54)
End, which is connected in, puts blister cavities (102) side wall, and air bag (54) lower end is connected on pressing lever (52).
5. a kind of paper perforating mold piercing knife according to claim 1, it is characterised in that: the cutter head (3) is one
The component of kind wolfram steel material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710528253.XA CN107097291B (en) | 2017-07-01 | 2017-07-01 | A kind of paper perforating mold piercing knife |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710528253.XA CN107097291B (en) | 2017-07-01 | 2017-07-01 | A kind of paper perforating mold piercing knife |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107097291A CN107097291A (en) | 2017-08-29 |
| CN107097291B true CN107097291B (en) | 2018-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710528253.XA Active CN107097291B (en) | 2017-07-01 | 2017-07-01 | A kind of paper perforating mold piercing knife |
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| Country | Link |
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| CN (1) | CN107097291B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108544575A (en) * | 2018-06-15 | 2018-09-18 | 重庆草衣木食文化传播有限公司 | A kind of plank positioning-cutting device |
| CN111618946A (en) * | 2020-06-04 | 2020-09-04 | 钱文 | Bill perforating device |
| CN114589748A (en) * | 2022-03-03 | 2022-06-07 | 江苏奇纳新材料科技有限公司 | Cotton punching device of refractory material heat preservation |
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| US5699707A (en) * | 1995-02-01 | 1997-12-23 | Automated Solutions, Llc | High speed sheet material cutter and method of using same |
| US5699708A (en) * | 1995-08-28 | 1997-12-23 | Unittool Punch & Die Company | Punch press device |
| US5697278A (en) * | 1995-09-28 | 1997-12-16 | Shun-Yi; Wang | Apparatus for shape cutting |
| US5901598A (en) * | 1996-05-30 | 1999-05-11 | Afon Haar Maschinenbau Gmbh & Co. | Method and apparatus for ejecting sheet metal parts from a press |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107097291A (en) | 2017-08-29 |
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Effective date of registration: 20181105 Address after: 402660 block D25-4/02, North District of Tongnan Industrial Park, Chongqing Applicant after: Chongqing run min Paper Co., Ltd. Address before: Electrical and Mechanical Department of Career Technical College, Sufu Road, Suzhou, Anhui Applicant before: Zhang Di |
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