CN1088639C - Material feeder - Google Patents
Material feeder Download PDFInfo
- Publication number
- CN1088639C CN1088639C CN97109636A CN97109636A CN1088639C CN 1088639 C CN1088639 C CN 1088639C CN 97109636 A CN97109636 A CN 97109636A CN 97109636 A CN97109636 A CN 97109636A CN 1088639 C CN1088639 C CN 1088639C
- Authority
- CN
- China
- Prior art keywords
- gear
- transfer member
- feed
- feeding
- clamping device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/30—Feeding material to presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/02—Advancing work in relation to the stroke of the die or tool
- B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Press Drives And Press Lines (AREA)
- Reciprocating Conveyors (AREA)
- Advancing Webs (AREA)
Abstract
A transfer device for the material, by which feed speed and feed length can be easily adjusted. A small gear provided eccentrically at the top end of a drive shaft, is engaged with the internal teeth of a large gear which is on the same shaft to the drive shaft. The diameter of the pitch circle of the small gear and the radius of the pitch circle of the internal teeth, are equal. A first moving part is moved straight in a feed direction. A second moving part is moved along in crossing orthogonally the feed direction. The drive shaft is revolved and the small gear is rolled along the internal teeth of the large gear. The second moving part is reciprocated along the diameter of the large gear. The first moving part and a moving clamping means are moved back and forth straight along the feed direction. The material is sent to a finishing machine.
Description
Technical field
The present invention relates to a kind of material feeder, relate in particular to the material feeder of a kind of linear reciprocal movement of the clamping device by can unclamping the clamping material to machining tool feeding material.
Background technology
Usually, be to finish traditionally to feeding materials such as machining tool such as press by the material feeder that is known as the grip(per) feed machine in this technical field.Material feeder comprises and is suitable for the clamping device of grip(per) feed material releasably, by its linear reciprocal movement material is fed to machining tool.The linear reciprocal movement of clamping device is generally finished by cylinder.Also can finish in addition by any suitable mechanical type linear reciprocal movement mechanism.Can think that linear reciprocal movement mechanism is the combination of various mechanism, as the feed mechanism of ball-screw feed mechanism, belt feed mechanism, slider-crank mechanism, employing restriction cam such as barrel cam or grooved cam or have the similar means of servo motor.
Adopt traditional material feeder of cylinder to control the material amount of feeding by block or the reciprocating scope of like parts adjustment supportive device.Adjusting also needs mobile block.Therefore, the accurate adjustment of feeding is very difficult.In addition, material feeder is to brake clamping device by contacting of clamping device and block.This will produce owing to the inertia of device and material and impact.Regrettably, impact and action of inertia can cause finishing accurately the feeding of material.
In addition, the above-mentioned reciprocating motion in conjunction with the clamping device that forms that utilizes motor and mechanical driving mechanism is to realize by the direction of rotation that changes motor, sets the material amount of feeding according to the revolution of motor simultaneously.Regrettably, in each reciprocating motion process of clamping device, all need to control motor beginning, stop, normally rotation, reverse rotation, acceleration and deceleration or the like, this just causes the control of motor too complicated and difficult.
Summary of the invention
The present invention be directed to that the above-mentioned defective of prior art proposes.
Therefore, the purpose of this invention is to provide a kind of material feeder, it can easily regulate or control material feed speed and material feeding length, and can the simplification device structure.
The invention provides a kind of material feeder to machining tool index(ing) feed material.This material feeder comprises: a gear, and it has internal gear and rotatable; One driving shaft, its axle aligns with described Gear axis and is rotatable; One star gear, its pitch diameter equals the pitch radius of the described internal gear of described gear, with the rotation of described driving shaft, moves rotation simultaneously along described internal gear, and maintenance and the engagement of described internal gear; One drive unit is used to make described drive shaft turns; One first transfer member is used for moving back and forth at the enterprising line linearity of material direction of feed; One removable clamping device is installed on described first transfer member, is used for clamping and decontrols material; And one second transfer member, be positioned on described first transfer member, can move along the direction that is substantially perpendicular to the material feeding, and be connected with described star working gear.Therefore described star gear moves back and forth described second transfer member with respect to the rotation of the described internal gear of described gear on the diametric(al) of described gear, causes described first transfer member and removable clamping device to move back and forth along the material direction of feed.
In the solution of the present invention, material feeder also comprises adjusting device, selectively sets the position of gear thereby be used to make gear to rotate predetermined angle on its direction of rotation, thereby adjusts the reciprocal distance of first transfer member.
In the solution of the present invention, adjusting device comprises the external gear that is arranged on the described gear, with the adjustment gear of external gear engagement and the control member that makes the rotation of adjustment gear.
In the solution of the present invention, material feeder also comprises display unit, is used to show the reciprocating distance of being set by adjusting device of first transfer member.
Description of drawings
By below in conjunction with the accompanying drawing detailed description of the invention, know from experience and the these and other objects that the present invention may be better understood and a plurality of superiority of supervening being easy to, wherein:
Fig. 1 is the elevational sectional view of an embodiment of material feeder of the present invention;
Fig. 2 is the internal structure diagrammatic top view of Fig. 1 material feeder;
Fig. 3 is the right view that the material feeder of Fig. 1 has carried out partial cutaway; And
Fig. 4 (a) and Fig. 4 (b) are the drive principle schematic diagrames of material feeder shown in Figure 1.
The specific embodiment
Material feeder of the present invention is described below with reference to accompanying drawings.
Fig. 1 to 4 (b) has described the embodiment of material feeder of the present invention.The material feeder of this embodiment, in Fig. 1 and Fig. 2, totally represent by label 1, it is suitable on the horizontal direction shown in the arrow of Fig. 1 and 2, in promoting the feeding process the strip material index(ing) feed to right side machining tool (not shown), in pulling feeding process, with material from the machining tool on right side index(ing) feed left.
Material feeder 1 comprises frame 2, and it is positioned at center basically, device inside, and it has can be around its central axis rotation and the driving shaft 3 that vertically extends.Also be provided with servo motor 4 in the frame 2 as drive unit.The output shaft that stretches out straight down is housed on the servo motor 4.The bottom of driving shaft 3 is connected by transmission mechanism 15 work of being made up of belt pulley and belt with the output shaft of servomotor 4.
Also be provided with gear 5 in the frame 2, can on horizontal plane, rotate.The gyroaxis of gear 5 aligns with driving shaft 3 and links to each other with driving shaft 3 tops by bearing.Therefore, even gear 5 also not rotation thereupon when servo motor 4 drives driving shaft 3 rotations.Gear 5 comprises external gear 6 and internal gear 7.External gear 6 can be made of worm gear.
The top of driving shaft 3 also is provided with an outwardly directed flange.By pin 9 star gear 8 is housed on flange, can on horizontal plane, rotates.As the pin 9 of the gyroaxis of star gear 8, the axis of its axis and driving shaft 3 is parallel to each other.Star gear 8 is meshing with each other with the internal gear 7 of gear 5.The pitch diameter of star gear 8 equates with the pitch radius of internal gear 7.The pitch circle sizableness of star gear 8 is in half of the internal gear 7 of gear 5 or rather.Like this, the rotation of driving shaft 3 makes star gear 8 move simultaneously along internal gear 7 to rotate and keep engagement with internal gear 7 under the drive of servo motor 4.
The internal gear 7 of gear 5 meshes with the worm screw 10 that gear is adjusted in conduct.Worm screw 10 is positioned at an end of adjusting axle 11.Adjust axle 11 and be supported in frame 2 rotationally, its other end is protruding from frame 2.Stretch out a handwheel 12 from the other end of frame 2, as control member.Like this, rotate handwheel 12, just can make and adjust axle 11 and worm screw 10 rotations, thereby gear 5 is rotated.This makes and the star gear 8 of gear 5 engagements moves along internal gear 7 when rotating, and gear 5 and star gear 8 intermeshing positions are moved around the driving shaft 3 as pivot.
Gear 5 has the output belt pulley 13 that links to each other with its bottom surface.Output belt pulley 13 is installed in rotation on the driving shaft 3 by bearing.Rotary encoder 14 is set, as the checkout gear that detects corner in the frame 2.The power shaft of belt leather belt wheel (not shown) is housed on the rotary encoder 14.Between power shaft belt pulley and output belt pulley 13, belt 16 is set.Therefore, when hand wheel 12 transmitting gears 5, the star gear is rotatablely moved or the motion while rotating, encoder 14 detects the angle that star gear 8 rotates around driving shaft 3 on gear 5, and this angle is exported with signal form.
Below the mechanism of rotatablely moving of above-mentioned driving mechanism being changed into linear reciprocal movement will be described.
Be provided with a pair of first guide post 20 on the top of frame 2, it is parallel to each other on material feeding or direction of transfer.First guide post 20 is provided with first transfer member 21, can move back and forth at the enterprising line linearity of material direction of feed.First transfer member 21 comprises a pair of slide block 22, can move along guide post 20, also comprises second guide post 23 that is used to connect two slide blocks 22.Second guide post 23 is vertical with first guide post 20.
In conjunction with Fig. 4 (a) and 4 (b), the track of second transfer member 24 in motion process is described now.Shown in Fig. 4 (a), when roundlet along the great circle inner periphery and be in contact with it when rolling, a bit form the hypocycloidal track on the roundlet.The ratio of supposing large and small radius of circle is 2: 1, and then hypocycloidal is formed in reciprocating linear straight line on the axis of great circle.In aforesaid embodiment, the pitch diameter of setting star gear 8 equals the pitch radius of internal gear 7, and therefore, second transfer member 24 trends towards moving along the diameter of gear 5 is linear.
If star gear 8 is decided to be material direction of feed point at first with the initial position of internal gear 7 engagements of gear 5, shown in Fig. 4 (a), the direction of motion of second transfer member 24 is consistent with the diametric(al) of gear 5, promptly is parallel to the material direction of feed.Therefore, first transfer member, 21 edges are corresponding to the stroke reciprocating of the pitch diameter of gear 5.In Fig. 4 (a), stroke is corresponding to the pitch diameter D of gear 5.In addition, when hand wheel 12 comes swing pinion 5, make the initial position of star gear 8 and internal gear 7 engagements of gear 5 on the material direction of feed with respect to putting the θ angle of having advanced, position at first; The direction of motion of the second transfer member 24 still diametric(al) with gear is consistent, with respect to material direction of feed deflection the θ angle.At this moment, first transfer member 21 will be a stroke reciprocating with the respective distance Dcos θ based on the diameter D of gear 5.
As shown in Figure 2, frame 2 arranged outside display unit 30, be used to show first transfer member, 21 reciprocating strokes.Under the situation of Fig. 4 (a), display unit shows D; And under the situation of Fig. 4 (b), show Dcos θ (θ ≠ 0).The signal of above-mentioned rotary encoder 14 output expression angle θ.Signal is transfused to the control assembly (not shown) then, finishes the computing of Dcos θ.The result of computing is shown in display unit 30 with the form of the numeral of any suitable unit.Therefore seeing that the numeral on the display unit 30 shows hand wheel 12, as long as the length that operation just can be adjusted or control the material feed distance or install the material of 1 feeding.
Reciprocating first transfer member 21 has drive rod 31 on the material direction of feed, links to each other with its near-end, and the direction of motion of this bar and first transfer member 21 be arranged in parallel.Drive rod 31 is supported by linear bearing 32, so that can move along its axis.There is a far-end to stretch out the sensing machining tool by linear bearing 32 drive lever supported 31 from frame 2.This end of drive rod 31 is provided with movably clamping device 35, is used for clamping the feeding material with loosening.
The structure of removable clamping device 35 as shown in Figure 3.Terminal fastening installation one substrate 36 of drive rod 31 especially, the upper surface of this substrate is as the material clamping surface, and the feeding material is used to be installed.The upper surface of substrate 36 is fastened with jig 37, and solenoid 38 is housed on it.The central axis of solenoid 38 is vertical.Solenoid 38 comprises coil windings 39 and plunger 40, and iron core 40 can insert coil windings 39 and vertically move.The top of plunger 40 is provided with flange, contacts with magnetic sheet on being installed on coil windings 39 end faces.Bolt shape holder 41 inserts plunger 40 and also passes its center, makes the holder 41 can the material of clamping between holder 41 and clamping surface 33.The top of holder 41 protrudes upward from plunger 40, and adjustable diameter and screw adjusting nut 42 is equipped with at this top.Therefore, handle holder 41 and adjusting nut 42 and just can adjust the distance of holder 41 with respect to plunger 40 bottoms.Be provided with spring 43 in the coil windings 39 as biasing device, between the flange of the bottom of coil 39 flange and plunger 40.When solenoid 38 was not switched on, plunger 40 was upwards pressed and is lifted by spring 43, forms between coil windings 39 and the flange and the gap of the preset distance between holder 41 lower ends and the clamping surface 33.Jig 37 is provided with block 44, is used to limit the tip position of plunger 40.The vertical position of this block can be adjusted.
When coil windings 39 energisings, iron core 40 overcomes the elastic force of spring 43 to pressing down, and holder 41 can be moved to clamping surface 33 directions.Therefore, when the feeding material was positioned on the clamping surface 33, it was held between holder 41 and the clamping surface 33.
Above fixed clamp device 50 and removable clamping device 35, be provided with an openable shield cap 51.Be provided with a pair of first guide roller 52 in frame 2 away from a side of machining tool, be used for the feeding material is led and maintenance contacts with the upper and lower surface of material, also be provided with a pair of second guide roller 53, be used to lead and maintenance contacts with the two sides of material.
The structure of the material feeder of described embodiment will be described below.
The feeding material of material feeder 1 can be for example with the long and thin metal material of shape among the described embodiment.This material can be around close device 1 on the reel and by device 1 feeding or conveying continuously.
When needs carried out the promotion feeding of material, material unclamped from fixed clamp device 50, then by removable clamping device 35 clampings near fixed clamp device 50.Only just can firmly finish with two clamping devices 35 and 50 clamping materials by charging for coil 39.After giving coil 39 chargings, the elastic force that iron core 40 overcomes spring 43 moves down, and makes holder 41 be securely held on material between holder and the clamping surface 33.In the charging of coil, have no progeny, spring 43 iron core 40 that moves up, material just unclamps from holder 41.
The intermittent interruption of device 1 depends on the process operation of machining tool.Or rather, servomotor 4 stops when the feeding material and starts during at the machining tool complete operation, makes removable jig 35 turn back to the feeding initial position and prepares next feeding operation.Therefore, device 1 operation according to machining tool starts repeatedly and ends, only needs 4 of servomotors to rotate by a predetermined direction in this course and interrupts its rotation, and this does not just need servomotor 4 backward rotation.Do not carry out the structure that backward rotation has been simplified control module.
The clutch mechanism that device 1 also can adopt machinery or electromagnetic start starts according to the operation of machining tool, and keeps motor 4 to rotate with constant speed.This structure makes that finishing of the work of device 1 and interrupt operation is consistent with the operation of machining tool.Therefore, motor 4 is not limited to servo motor.
In the device 1 of described embodiment, the feeding of material is finished by servo motor 4, and the clamping operation is finished by solenoid 38.The control of servo motor 4 and solenoid 38 can be finished by electrical control, and both are controlled with required precise time by shared control section (not shown).
Servo motor 4 drives driving shafts 3 rotations, star gear 8 is rotated and moves along the internal gear 7 of gear 5, makes second transfer member 24 that links to each other with star gear 8 move back and forth on the diametric(al) of gear.This motion of second transfer member 24 makes first transfer member 21 and coupled removable clamping device 35 along first guide post, 20 linear reciprocal movements, thereby makes clamping device 35 clamp material and it is fed to machining tool.When by removable clamping device 35 feeding materials through a stroke after, fixed clamp device 50 firm grip are lived material, and removable clamping device 35 is decontroled materials and got back to initial position.Then, machining tool is processed material.
The motion of first transfer member 21 and coupled removable clamping device 35, the point on the track as shown in Figure 4, carry out as follows: the beginning (beginning of stroke) in motion underspeeds or speed, and then makes its increase.Then, when motion ends or arrive the stroke end of close machining tool, underspeed once more.Therefore, when the material feeding begins, underspeed, in feeding, gather way, underspeed at the close Working position place that feeding is reached home then.
In feeding at first, need removable jig 35 to clamp material.Therefore, when feeding begins, underspeed, can increase a period of time, just guaranteed that when feeding began, clamping device 35 clamped material securely for the needs that satisfy the clamping operation.
The material of feeding has inertia, and this just might produce unnecessary situation out of position when material moves with predetermined stroke for processing.The device of described embodiment can be avoided this defective effectively, because reduced speed when material is the stroke end near Working position, accurately locate the position that stroke limited that makes material pass through removable clamping device 35.
Therefore, in the device 1 of described embodiment, the reciprocating mechanism of removable clamping device 35 makes the beginning of feeding and ending phase all carry out under the reduction of speed situation, even also be like this in servo motor 4 controlled speedups at high speed or deceleration.
Device 1 structure makes the material feed speed depend on the rotating speed of servo motor 4, thereby the rotating speed that increases servo motor 4 can cause the increase of feed speed.
In device 1, the length of material feeding can be regulated at an easy rate by handwheel 12 in a movement travel of once-through operation or removable clamping device 35.The setting of material feeding length directly is shown in display unit 30 with digital form, thereby has improved operability.
When carrying out the pulling feeding of material, material unclamps from fixed clamp device 50, is positioned at removable clamping device 35 clampings of machining tool one side then.Then, removable clamping device 35 clampings material and are sent to fixed clamp device 50.When stroke of removable clamping device 35 mobile materials, fixed clamp device 50 clamps material, and removable then clamping device 35 is decontroled material, turns back to initial position.Afterwards, the processed machine tooling of material.
In the material feeder of described embodiment, the conversion that promotes between feeding and the pulling feeding can be regulated the reciprocating motion of removable clamping device 35 and the time relationship between removable clamping device 35 and the fixed clamp device 50 clampings/relieving material realizes by electricity.
Also can realize in addition by the position of engagement between the internal gear 7 that changes meshing relation, especially star gear 8 and gear 5.Especially but hand wheel 12 changes the position of star gear 8 with respect to the internal gear 7 of gear 5, thereby changes the material feeding length.In this example, when the θ angle among Fig. 4 (b) is in 90 ° to 270 ° of scopes, is in 0 ° to 90 ° with angle θ when angle θ is in 90 ° to 120 ° and compares during with 270 ° to 0 ° scope, obviously changed the direction of feed of material.Therefore, suitably set angle θ can not change above-mentioned electric sequential and can change the material direction of feed.When changing angle θ and set the direction of feed of material and stroke, can set 0 ° to 90 ° is a material direction of feed, and 90 ° to 180 ° be another material direction of feed.
The material feeder of described embodiment also can be used for can not or being not easy to adopt the occasion of air pressure effectively, because clamping device and feed mechanism all are electrically driven (operated).In addition, this material feeder is suitable for being applied on any machining tool.But it is more suitable for being applied on the press machine tool of the banded sheet material of punching press etc.
In addition, in described embodiment, servo motor uses as the drive unit of material feeder.The drive unit of device 1 that also can be used for the described embodiment of this lathe with the drive force of press machine tool.For this reason, for example can adopt linkage that driving force is passed to device 1.In this example, the operation of driving force and machining tool synchronously intermittently is delivered to device 1.End material feeding operation like this when the machining tool rapidoprint, driving force is not passed to device 1, and carries out feeding and backhaul operation when rapidoprint not.
In sum, material feeder of the present invention is easy to adjust material feed speed and material feeding length, and simplifies the structure.Therefore, the present invention allows to reduce feed speed, this location that can finish material feeding operation and material satisfactorily in the beginning of material feeding and ending phase.
The preferred embodiment of the present invention has been carried out description to a certain degree with reference to accompanying drawing, can significantly improve or change according to above-mentioned technology.Will be appreciated that within the scope of the appended claims the present invention can implement not according to the mode of specific description.
Claims (4)
1. material feeder is used for off and on comprising to machining tool feeding material:
One gear has internal gear and rotatable;
One driving shaft, its axle aligns with described Gear axis and is rotatable;
One star gear, its pitch diameter equals the pitch radius of the described internal gear of described gear, with the rotation of described driving shaft, moves rotationally along described internal gear, and maintenance and the engagement of described internal gear;
One drive unit is used to make described drive shaft turns;
One first transfer member can move back and forth at the enterprising line linearity of material direction of feed;
One removable clamping device is installed on described first transfer member, is used for clamping and decontrols material; With
One second transfer member is positioned on described first transfer member, can move along the direction that is substantially perpendicular to the material feeding, and be connected with described star working gear;
Described star gear moves back and forth described second transfer member with respect to the rotation of the described internal gear of described gear on the diametric(al) of described gear, cause described first transfer member and removable clamping device to move back and forth along the material direction of feed.
2. material feeder as claimed in claim 1, it is characterized in that, also comprise adjusting device, be used for the described gear of required angular turn, selectively set the position of described gear on its rotation direction, thereby adjust the reciprocating motion length of described first transfer member.
3. material feeder as claimed in claim 2 is characterized in that, described adjusting device comprises an external gear that is positioned on the described gear, an adjustment gear that is meshed with described external gear, and the control member that is used to rotate described adjustment gear.
4. as claim 2 or 3 described material feeders, it is characterized in that, also comprise display unit, be used to show the reciprocating distance of described first transfer member of setting by described adjusting device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8076622A JPH09267143A (en) | 1996-03-29 | 1996-03-29 | Transfer device for material |
| JP076622/96 | 1996-03-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1163179A CN1163179A (en) | 1997-10-29 |
| CN1088639C true CN1088639C (en) | 2002-08-07 |
Family
ID=13610462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97109636A Expired - Fee Related CN1088639C (en) | 1996-03-29 | 1997-03-29 | Material feeder |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH09267143A (en) |
| KR (1) | KR100254535B1 (en) |
| CN (1) | CN1088639C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040043366A (en) * | 2002-11-18 | 2004-05-24 | 효동기계공업 주식회사 | improved apparatus for supplying material in a high-speed precision former |
| CN102491078B (en) * | 2011-12-13 | 2013-08-14 | 中江机电科技江苏有限公司 | Material pulling step transformation mechanism |
| CN103253503B (en) * | 2011-12-13 | 2015-04-22 | 中江机电科技江苏有限公司 | Step pitch changing mechanism |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4452441A (en) * | 1981-09-17 | 1984-06-05 | Rockwell International Corporation | Newspaper stream forming device |
| JPS63108933A (en) * | 1986-10-24 | 1988-05-13 | Futaba Corp | Material feeding device |
| US4926274A (en) * | 1986-12-04 | 1990-05-15 | Kabushiki Kaisha Toshiba | Magnetic head apparatus having surfaces contoured to minimize friction between a magnetic head and a magnetic disk |
-
1996
- 1996-03-29 JP JP8076622A patent/JPH09267143A/en active Pending
-
1997
- 1997-03-29 KR KR1019970011356A patent/KR100254535B1/en not_active IP Right Cessation
- 1997-03-29 CN CN97109636A patent/CN1088639C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4452441A (en) * | 1981-09-17 | 1984-06-05 | Rockwell International Corporation | Newspaper stream forming device |
| JPS63108933A (en) * | 1986-10-24 | 1988-05-13 | Futaba Corp | Material feeding device |
| US4926274A (en) * | 1986-12-04 | 1990-05-15 | Kabushiki Kaisha Toshiba | Magnetic head apparatus having surfaces contoured to minimize friction between a magnetic head and a magnetic disk |
Also Published As
| Publication number | Publication date |
|---|---|
| KR970064897A (en) | 1997-10-13 |
| JPH09267143A (en) | 1997-10-14 |
| CN1163179A (en) | 1997-10-29 |
| KR100254535B1 (en) | 2000-08-01 |
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