CA1269219A - Conveyor in plastic working machine - Google Patents
Conveyor in plastic working machineInfo
- Publication number
- CA1269219A CA1269219A CA000566343A CA566343A CA1269219A CA 1269219 A CA1269219 A CA 1269219A CA 000566343 A CA000566343 A CA 000566343A CA 566343 A CA566343 A CA 566343A CA 1269219 A CA1269219 A CA 1269219A
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- Canada
- Prior art keywords
- arms
- working
- arm
- transfer bars
- stations
- Prior art date
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Abstract
ABSTRACT OF THE DISCLOSURE
A conveyor in a plastic working machine, wherein lower dies and upper dies for plastic working of a work in collaboration are disposed on a plurality of working stations, respectively, the stations being set at intervals along the direction in which the work is conveyed, arms each having a handling mechanism for holding the work are provided on transfer bars disposed sideway of the working stations for conveying the work in sequence among the working stations, the transfer bars are provided on both sides of each working station, the arms are bridged between both the transfer bars with both the ends borne on both the transfer bars movably back and forth in the conveying direction or fixed to both the transfer bars.
A conveyor in a plastic working machine, wherein lower dies and upper dies for plastic working of a work in collaboration are disposed on a plurality of working stations, respectively, the stations being set at intervals along the direction in which the work is conveyed, arms each having a handling mechanism for holding the work are provided on transfer bars disposed sideway of the working stations for conveying the work in sequence among the working stations, the transfer bars are provided on both sides of each working station, the arms are bridged between both the transfer bars with both the ends borne on both the transfer bars movably back and forth in the conveying direction or fixed to both the transfer bars.
Description
9~1~
CONVEYO~ IN PL~STIC WORKING M~CI-IINE
BACKGRO~ND O~ Tl-iE INVENTION
Field o~ the Invention This invention rela-tes to a conveyor in a plas-tic working machine wherein a lower die and an upperdie :Eor cooperatingly per~orming plastic worl<ing oE works are disposed on each of a plurality of workina stations set at intervals alon~ the direction in which the works are conveyed, and an arm provided wi-th a handling mechanism for holding the works is provided on a transEer bar disposed sideway of the working sta-tions for conveying the wor]cs in sequence between the worlcing stations.
Description of the Prior ~rt In conveyors oE the above type, an arm is provided on a trans.Eer bar disposecl on one side of the working stations and is extended toward the working stations, or arms are provided on a pair of transfer bars disposed on both sides of the working stations and are extended toward the interposed stations.
However, in a construction in which the arm is supported one-sidedly on -the transfer bar as de-scribed, vlbrations ma~ be caused to the arm during conveyance, and thus works cannot be held securely or may drop unexpectedly in more undesirable ~9~1~
cases.
Thls Inventlon has been made In vlew of the above problems, and Its obJect Is to provlde a conveyor In a plastlc worklng mac~lne capable of stablJlzlng a holdlng state of works by supportlng an arm double-sldedly.
To attaln such obJect, accordlng to thls Inventlon, transfer bars are provlded on both sldes o~ the worklng statlons, and an arm Is brldged between and borne on both transfer bars wlth both ends thereof movable longltudlnally along the dlrectlon In whlch works are conveyed or flxed to the transfer bars.
Accordlngly, therefore, the present Inventlon provldes In a worklng machlne havlng palrs of lower dles and upper dles dlsposed on a plurall~y of worklng statlons, respectlvely, for cooperatlvely worklng a workplece at the respectlve statlons, the statlons belng set at Intervals In a dlrectlon of conveyance of the workplece, a conveyor whlch comprlses: a palr of transfer bars spaced from one another a predetermlned dlstance and dlsposed on opposlte lateral sldes of the worklng statlons and extendlng parallel to each other In the conveylng dlrectlon, sald palr oF transfer bars belng unltarlly movable In a vertlcal dlrectlon and In sald conveylng dlrectlon by respectlve drlvlng means; a plurallty of arms dlsposed laterally brldglng between the transfer bars so that each arm extends ~he full predetermlned dlstance, sald arms, except for at least one arm, belng fixed to sald transfer bars In a manner non-movable In the conveylng dlrectlon relatlve to sald transfer bars, sald at least one arm belng adJustably movable relatlve to the bars in the conveylng dlrectlon by a drIve mechanlsm; and a handllng mechanIsm provlded for each arm for holdlng the workplece.
Owlng to such constructlon, slnce both ends of the arm are supported by the transfer bars, vlbratlon of the arm Is mlnlmlzed durlng conveylng operatlon of the transfer bars, a work Is held stably by a handlIng mechanlsm, and thus works can be conveyed securely.
The abo~e and other obJects, features and advantages of the Inventlon wlll be elucldated from the followng descrlptlon of preferred embodiments wlth refernece to the accompanylng drawlngs.
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BRIEF DESCRIPTION OF TIIE DRAWINGS
Fig. 1 to Fig. 7 represent a first embodiment of this invention, wherein Fig. 1 is a general sche-matic side sec-tional view, Fig. 2 is an enlarged plan view of a main part of Fig. 1, Fig. 3 is a view taken on line III - III of Fig. 2, Fig. ~ is an en-larged sec-tional view taken on line IV - IV of Fig.
CONVEYO~ IN PL~STIC WORKING M~CI-IINE
BACKGRO~ND O~ Tl-iE INVENTION
Field o~ the Invention This invention rela-tes to a conveyor in a plas-tic working machine wherein a lower die and an upperdie :Eor cooperatingly per~orming plastic worl<ing oE works are disposed on each of a plurality of workina stations set at intervals alon~ the direction in which the works are conveyed, and an arm provided wi-th a handling mechanism for holding the works is provided on a transEer bar disposed sideway of the working sta-tions for conveying the wor]cs in sequence between the worlcing stations.
Description of the Prior ~rt In conveyors oE the above type, an arm is provided on a trans.Eer bar disposecl on one side of the working stations and is extended toward the working stations, or arms are provided on a pair of transfer bars disposed on both sides of the working stations and are extended toward the interposed stations.
However, in a construction in which the arm is supported one-sidedly on -the transfer bar as de-scribed, vlbrations ma~ be caused to the arm during conveyance, and thus works cannot be held securely or may drop unexpectedly in more undesirable ~9~1~
cases.
Thls Inventlon has been made In vlew of the above problems, and Its obJect Is to provlde a conveyor In a plastlc worklng mac~lne capable of stablJlzlng a holdlng state of works by supportlng an arm double-sldedly.
To attaln such obJect, accordlng to thls Inventlon, transfer bars are provlded on both sldes o~ the worklng statlons, and an arm Is brldged between and borne on both transfer bars wlth both ends thereof movable longltudlnally along the dlrectlon In whlch works are conveyed or flxed to the transfer bars.
Accordlngly, therefore, the present Inventlon provldes In a worklng machlne havlng palrs of lower dles and upper dles dlsposed on a plurall~y of worklng statlons, respectlvely, for cooperatlvely worklng a workplece at the respectlve statlons, the statlons belng set at Intervals In a dlrectlon of conveyance of the workplece, a conveyor whlch comprlses: a palr of transfer bars spaced from one another a predetermlned dlstance and dlsposed on opposlte lateral sldes of the worklng statlons and extendlng parallel to each other In the conveylng dlrectlon, sald palr oF transfer bars belng unltarlly movable In a vertlcal dlrectlon and In sald conveylng dlrectlon by respectlve drlvlng means; a plurallty of arms dlsposed laterally brldglng between the transfer bars so that each arm extends ~he full predetermlned dlstance, sald arms, except for at least one arm, belng fixed to sald transfer bars In a manner non-movable In the conveylng dlrectlon relatlve to sald transfer bars, sald at least one arm belng adJustably movable relatlve to the bars in the conveylng dlrectlon by a drIve mechanlsm; and a handllng mechanIsm provlded for each arm for holdlng the workplece.
Owlng to such constructlon, slnce both ends of the arm are supported by the transfer bars, vlbratlon of the arm Is mlnlmlzed durlng conveylng operatlon of the transfer bars, a work Is held stably by a handlIng mechanlsm, and thus works can be conveyed securely.
The abo~e and other obJects, features and advantages of the Inventlon wlll be elucldated from the followng descrlptlon of preferred embodiments wlth refernece to the accompanylng drawlngs.
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BRIEF DESCRIPTION OF TIIE DRAWINGS
Fig. 1 to Fig. 7 represent a first embodiment of this invention, wherein Fig. 1 is a general sche-matic side sec-tional view, Fig. 2 is an enlarged plan view of a main part of Fig. 1, Fig. 3 is a view taken on line III - III of Fig. 2, Fig. ~ is an en-larged sec-tional view taken on line IV - IV of Fig.
2, Fig. 5 is a plan view xepresenting a construction of a driving means, Fig. 6 is a sectional view taken on line VI - VI of Fig. 5, Fig. 7 is an enlarged sec-tional view taken on line VII - VII of Fig. 2; Fig.
8 is a general schematic side sectional view of a second embodiment which corresponds to Fig. l; Fig.
9 to Fig. 11 represent a third embodiment of this invention, wherein Fig. 9 is a general schematic side sectional view, Fig. 10 is an enlarged plan view of a main part oE Fig. 9, Fig. 11 is a sec-tional view ta]cen on line XI - XI of Fig. 10; Fig.
12 to Fig. 16 represent a fourth embodiment of this invention, wherein Fig. 12 is a general schematic side view, Fig. 13 is an enlarged sectional fiew of a main part of Fig. 12, Fig. 14 is an enlarged sec-tional view taken on line XIV - XIV of Fig. 13, Fig.
15 is a sec-tional view taken on line XV - XV of Fig.
14, Fig. 16 is a sectional view taken on line XVI -`:
::
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~VI of Fig. 15; Fig. 17 to Fig. 21 represent a fifth embodiment of this invention, wherein ~ig. 17 is a general schematic side sectional view, Fig. 1~ is an enlarged plan view of a main part of Fig. 17, Fig. 19 is an enlarged sectional view taken on line XIX - XIX of Fig. 18, Fig. 20 is a sectional view taken on line XX - XX of Fig. 19, Fig. 21 is a sec-tional view taken on line XXI - XXI of ~ig. 20.
DE:TAILED DE:SCRIPTION OF PI~EFEI~I<ED EMBODIMEI~TS
Referring now in detail to the drawings, in Fig. 1 which shows a first embodiment of this invention, a plurality oE, for example, first to fiEth working sta-tions Sl to Ss in this embodiment are set at regular intervals alony a direction 2 in which a worlc W is conve~ed on a plastic working machine,for example,on a press 1, and lower dies 31 to 35 and upper dies ~ to 45 for pressing the work W in collaboration are disposed on the working sta-tions Sl to Ss~ respectively. That is, the lower dies 31 to 35 are fixed at regular intervals on a bolster 6 on a pedestal 5 in the conveying direc-tion 2, and the upper dies 41 to 45 are suppor-ted on a holder 3 fixed on an elevator 7 corresponding-ly to the lower dies 31 to 35. A conveyor 9 is provided additionally on the press 1, and after a press working between the lower dies 31 to 35 and the up-per dies ~I to ~5 according -to a descent of the ele-vator 7, the conveyor 9 operates to convey the work W in sequence to the next working sta-tion in the conveying direction 2.
The conveyor 9 has a pair of transfer bars 10, 11 disposed in parallel with the conveying direction 2 on both sides of -the wor]cing sta-tions Sl to S5, and a plurality of arms ~la, Alb ... A5a, A5b laid between the transfer bars 10, 11 and movable longi-tudinally in the conveving direction 2. The work W
is conveyed according to displ~cements of the arms Ala, Alb 5a, ASb and the transfer baxs 10, 11, however, the worlcing stations Sl to Ss are similar to each other in their construction, and hence a description will be given of the Eirst worlcing st~-tion 51 and its neigh-borhood with reference to the drawings.
In also reEerring to Fig. 2, bo-th the transfer bars 10, 11 are provided to extend from the first working station Sl to the fifth work-ing station Ssl and the transfer bars 10, 11 are coupled to each other through stays 12 located among the work-ing stations Sl to Ss. Further, each stay 12 is disposed so as to come at the center among the work-ing stations Sl to Ss~ when both the transfer bars 9~9 10, 11 are kept s-ta-tionary at the time of press working.
In referring further to Fig. 3 and Fig. ~, guide rails 13 extending horizontally in the convey-ing direction 2 are disposed on both outsides of the transfer bars 10, 11, and each guide rail 13 is sup-ported by a strut 14 provided vertically on a floor surface. Travelling plates 16 are placed on both the guide rails 13 through a pair of wheels 15, and a truck 18 is constituted by coupling both the trav-elling plates 16 through a connec-ting rod 17. The truck 18 is capable of running on both -the guide rails 13 longitudinally in the conveying direction 2, and is arranged on the guide rails 13 correspond-ingly at least to both ends of the transfer bars 10, 11. Then, guide rods l9 are provided vertically near bo-th ends oE the connecting rod 17, a cylin-drical coupllng member 20 is inser-ted movably up and down in each guide rod 19, and these coupling members 20 are coupled -to end portions of the trans-fer bars 10, 11. Consequently, both the transfer bars 10, 11 are ~vable longi-tudinally in the convey-ing direction 2 by running and driving the .truclc 18 on the guide rails 13 in the same direction; Both the transfer bars lO, ll are 9;~19 also capable o moving vertically along the guide rods 19.
Next will be describe~ construction of a driv-ing means for driving the transfer bars 10, 11 with reference to Fig. 5 and Fig. 6. Driving means 21 for the transfer bars 10, 11 is provided with a mechan-ism for moving the transfer bars 10, 11 horizontally and another mechanism for moving both the transfer bars 10, 11 vertically. To move the transfer bars 10, 11 horizontally, the driving means 21 is pro-vided with Geneva arms 22, a Geneva plate 24 hav-ing grooves 23 for receiving the Geneva arms 22 therein, and a transfer mechanism 25 for transforming a ro-tational motion of the Geneva plate 24 into a hor-izontal reciprocating motion and transferring it to the transfer bars 10, 11.
A pedestal 29 with a pair of side plates 27, 28 provided vertically at an interval therebetween on a baseplate 26 is fixed on the floor surface on an upper side than both the transfer bars 10, 11 in the conveying direction 2, and a bevel gear 31 is fixed on the end of a first rotating shaft 30 which is ~orne rotatably on the one side plate 27 and projects outward of the side plate 27. On the other hand, a bevel gear 33 is fixed on a transfer shaft 32 extended ~ ~ .3 from a driving source (not shown) for driving the elevator 7, and the bevel gear 33 is engaged with the bevel gear 31. Second and third rotat-ing shafts 34, 35 parallel with the first rotating shaft 30 are borne rotatably between both side plates 27, 2~ of the pedestal 29. ~ first gear 36 is fixed on an end portion of the f.irst rotating shaft 30 projecting inward from the one side plate 27, and this gear 36 is engaged with a second gear 37 fixed on the second rotating shaft 34. Ac-cordingly, a rotation driving force -transferred to the first rotating shaft 30 is transferred further to the second rotating shaft 34.
A pair of disklike rotary plates 38, 39 facing each other with an axial interval therebetween are fixed on mid-way of the second rotating shaft 34. Then, disklike adjusting plates 40, 41 are borne rotatably on the second rotating shaft 34 axially outwardly of respective plates 38, 39 and are rotatable relatively to the rotary plates 38, 39 and the second rotating shaft 34. A cylindrical regulating member 42 is interposed between the second gear 37 and the one adjusting plate 40, and another cylindrical regulat-ing member 44 is interposed between a support plate 1~ ~i9~ ~
43 fixed on ~e second rotating shaft 34 and opposed other ad-justing plate 41. Accordingly, both the adjusting plates 40, 41 are kept from moving axially of the second rotating shaft 3~, and are in sliding contact with the rotary plates 38, 39, respectively.
The Geneva arms 22 are disposed at plural por-tions,for example,at three portions, at regular in-tervals in a circumferential direction of both the rotary plates 38, 39 and both the adjusting plates 40, 41. Roller 45 having an axis of rotation parallel with the axis of the second rotating shaft 34 is journaled in a loose end of each Geneva arm 22. Then, a base end of each Geneva arm 22 is en-gaged with both the rotary plates 38, 39 movably in the radial direction, and a projection 46 is provided on the base end and is engaged with a circular arc slit 47 perforated in each of the adjusting plates 40,41 and trend-ing radially inward at one circumferential end thereof.
Accordingly, when the adjusting plates 40, 41 are displaced angularly relative to the ro~ar,v Plates 38, 39, each Geneva arm 22 is forced to moves radlal Iy of the rotary plates 38, 39 and the adjusting plates 40, 41 and the amount of projec-tion of the roller 45 at its loose end from the second rotating shaft 34 will change.
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To drive and displace the adjusting plates 40, 41 at a relative angle to the rotary plates 38, 39, there is provided a sector gear 48 on one part of the circumfexence of the other adjusting plate 41, and a driving gear 49 engaging with the sector gear 48 is fixed on output shaf-t 50 of a pulse motor PM supported fixedly on the support plate 43. Ac-cordin~ly, upon actuating the pulse motor PM, the other adjusting plate 41 is displaced at a relative angle to the rotary plates 38, 39, each Geneva arm 22 comes near to or apart from the second rotating shaft 34, accompanied by displacement of the one adjusting plate 40 at a relative angle to the rotary plates 38, 39.
The Geneva plate 24 is fixed on midway of the third rotating shaft 35 at a position corresponding to the rotary plates 38, 39. 1~ plurality of, for example, four, grooves 23 are extended radially on the Geneva plate 24 with circumferenti.ally regular intervals therebetween, and each Geneva arm 22 can be fitted in each groove 23. In accordance with the rotation of second rotating shaft 34, the rotary plates 38, 39 are rotated to cause concurrent rotation of each Geneva arm 22 and adjusting plates 40, 41, and then the Geneva arm 22 is fitted in the groove 23, rotating the Geneva plate 24 and the third rotating shaft 35. Further, in accordance as each Geneva arm 22 projects large-ly from -the second rotating shaft 34, t~le roller 45 on the loose end of the Geneva arm 22 comes in con-tact with a side edge of the groove 23 on an upper side of the direction in which the Geneva plate 24 rotates, and the Geneva plate 24 is operated to run counter to a normal direction of rotation. Conse-quently, the third rotating shaft 35 can be delayed for rotational operation from s-tart in actuation of a driving source for the elevator 7, namely from start in operation of the elevator 7, by the time accord-ing to the rate of projection of the Geneva plate 22, and the delay time can be adjusted by control-ling the angular displacement of the adjusting plates 40, 41 relative to the rotary plates 38, 39.
A rotational operation of the Geneva plate 24, or a rotational operation of the third rotating shaft 35 is transferred to both the transfer bars 10, 11 through the transfer mechanism 25. The trans-fer mechanism 25 comprises a third gear 51 fixed on the third rotating shaft 35, a cam shaft 52 disposed rotatably around an axis parallel with the third rotating shaft 35, a fourth gear 53 engaging with the third gear 51 and fixed on the cam shaft 52, a pair of cams 54 fixed on both ends of the cam shaft 52, a link shaft 55 disposed rotatably around an axis parallel with the cam shaft 52, a pair of swing arms 57 each having one end fixed on the link shaft 55 and the other end journaling a cam roller 56 which is in slide con-tact with ~he associated cam 54, a pair of first links 58 each having one end fixed on the link shaft 55, and a pair of second links 60 with one end of each coupled to the other end of the first link 58 through a pin 59 parallel with the link shaft 55 and the other end coupled to the truck 18. The cam shaft 52 and the link shaft 55 are borne rotatably on a support mem-ber 61 fixed on the floor surface, respectively.
In the transfer mechanism 25, the third rotat-ing shaft 35 is driven to rotate from the Geneva arm 22 through the Geneva plate 24 in accordance with an operation of the elevator 7, namely the up-per dies 4I to 4 5, and further the the cam 54 is driven to rotate by engagement of the third gear 51 with the fourth gear 53. Since the cam roller ,.
56 is in sliding contact with the cam 54 rotating along with the cam shaft 52, the swing arm 57 swings and the link shaft 55 rotates reciprocatingly in a certain range, thus shaking the first link shaft 58. Consequently, the second link 60 recip-rocates longitudinally thereof, and both the trans-fer bars 10, 11 reciprocate longitudinally in the conveying direction 2 on the guide rails 13 through the truck 18.
To move the transfer bars 10, 11 vertically, there is provided a hydraulic cylinder (not shown) or the like between the connecting rod 17 of the truck 18 and both the transfer bars 10, 11, and thus the transfer bars 10, 11 are movable vertically according to an operation of the hydraulic cylinder.
Thus, the transfer bars 10, 11 are moved hori-zontally and vertically in the conveying direction 2 by the driving means 21, drawing a rec~angular path within a vertical plane as a whole.
In referring again to Fig. 2, the arms Ala, Alb are laid between the transfer bars 10, 11 cor-respondingly to the first working station Sl in the conveying direction 2, and the remaining arms A2a, A2b ... A5a, A5b are also laid between the transfer bars 10, 11 longitudinally in the conveying direc-tion 2 of the corresponding working stations S 2 to Ss. ~ccordingly, in adjacent working stations, a handling arm on the forward side in the conveying direction 2 and a handling arm on the rear side in ,.... . .
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that direction 2 are disposed on both sides of each stay 12. That is, for example, the arm Ala on the forward side in the conveying direction 2 in the first working station Sl and the arm A2b on the rear side in ~he conveying direction 2 in the sec-ond working station S2 are disposed on both sides of the stay 12.
In also .referring to Fig. 7, a guide slot 52 extending in the conveying direction 2 is perforat.ed in each the transfer bars 10, 11 correspondignly to the working stations Sl to Ss.
Then, a projection 64 projecting downward and hav-ing a locki.g part 63 at the nose is provided on the arms Ala, Alb ... A5a, A5h. ~nd each projection 64 is inserted in the guide slo~ 62 to have the locking part 63 locked on the ~ransfer bars 10, 11.
Accordingly, the~arms Ala, Alb ... A5a, A5b can be mo~ed on the transfer bars 10, 11 through the guide slot 62 in the conveying direction 2.
An arm driving means 65 for driving such arms Ala, Alb ... ~5a,.A5b comprises a pair of driving racks 66 disposed movably in the conveying direc-tion 2 on sides of the transfer bars 10, 11, racks 67 provided on the arms Ala to A5a on the forward side in the conveying direction 2 in the working -- 1~ --stations Sl to Ss and opposite -to the driving racks 66, racks -68 provided on the arms Alb to A5b on the rear siae in the conveying direction 2 in the work-ing stations Sl to Ss and opposite to the driving racks 66, single pinions 69 interposed between the racks 67 and the driving racks 66 and journaled on the transfer bars 10, 11, pairs of pinions 70, 71 interposed between -the racks 68 and the driving racks 66, respectively, and journaled on the transfer bars 10, ll, driving pinions 72 journaled on end por-tions of both the transfer bars 10, 11 and engaging with the driving racks 66, an arm driving source 73 fixed and disposed on the floor surface, and a power transfer mechanism 75 coupling a rotating shaft 74 of-each driving pinion 72 to the arm driving source 73.
The driving rack 66 is provided extendedly in the conveying direction 2 and placed on a guide shelf 76 provided projectingly on ~ sicle wall of each of the transfer bars lO, ll. A guide slot 77 extending in the conveying direction 2 is perforated in side of each clriving rack 66, a locking pin 78 provided on the transfer bars 10, 11 is inserted in the guide slot 77, and a locking part 79 provided on a tip of the locking pin 78 is locked on the driving rack , . - 15 -.:
l~ti9~
66. Accordingly, both the driving racks 66 can be moved longitudinally in the conveying direction 2 while sliding on the sides of the -transfer bars 10, 11 .
The ar~ driving source 73 is, for example, a pulse motor, and the power transfer mechanism 75 coupl-ing an output shaft 80 of the driving source 73 to ~e rotating shaft 74 of the driving pinion 72 comprises a transfer cylinder 82 coupled to the outpu-t shaft 80 through a universal joint 81, and a transfer shaft 84 fitted in and spline~connected to the transfer cylinder 82 while being coupled to the rotating shaft 74 through a univer-sal joint 83. Consequently, the power transfer mechanism 75 is capable of transferring a rotation driving force from the arm driving source 73 to the driving pinion 72 through the rotating shaft 74 ir-respective of horizontal and/or vertical movement of the transfer bars 10, 11.
In the arm driving means 65, the driving racks 66 move forward or backward in the conveying direc-tion 2 according to a rotational operation of the driving pinions 72. Operation of the driving racks 66 is transferred to the arms Ala to A5a through the pinions 69 and the racks 67 and thus the arms Ala to A5a move in a direction counter to the driving racks 66.
~ 3 Also, the operation of the driving racks 66 is transferred to the arms Alb to A5b througn the paired pinions 70,71 and the racks 68, and the arms Alb to A5b move in the same direction as the driving racks 66. Accordingly, the arms, for example, Ala, A2b on both sides of the stay 12 are moved by the driving means 65 ln the directions counter to each other, or in the direction coming near to or apart from each other.
A control means 85 is connected to the arm driving source 73 for controlling the direction of rotation of the arm driving source 73 in such a manner that the arms Ala,Alb ...
A5a,A5b will be on standby among the working stations Sl to S5 at the time of press working by the lower dies 31 to 35 and the upper dies 41 to 45 and also the arms Ala,Alb ... A5a,A5b will move onto the corresponding working stations Sl to S5 at the time of conveyance starting.
Further, suction such as, for example, those employed in the later described fourth and fifth embodlments, are provided on lower portions of the arms Ala,Alb ... A5a,A5b, and the work W
is held on the suctlon means.
Operation of this embodiment will next be described.
After press working by the lower dies 31 to 35 and the upper dies 41 to 45 in the working sta-tions Sl to Ss, the conveyor 9 is actuated and the work W on the working stations Sl to Ss is conveyed to the ne~t working stations S 2 to Ss and a dis-charge position. That is, when the elevator 7 and the upper dies 4I to 45 integral therewith start ascending, first the arm dxiving means 65 is actu-ated and the corresponding arms Ala, Alb ... A5a, A5b are moved onto the working stations Sl to Ss.
Next, when the corresponding works are held on the arms Ala, Alb ... A5a, A5b, both the transfer bars lO, 11 are operated to ascend by the driving means 21, move horizontally forward in the conveying di-rection 2 to convey the works W onto the next work-ing stations and then descend. The works W are thus placed onto the corresponding working stations by releasing each work W from being held on the arms Ala, Alb ... A5a, A5b. Both the transfer bars 10, 11 then move to the rear side in the conveying di-rection 2, and the arms Ala, Alb ... A5a, A5b return to the working stations Sl to S 5 as they were. The arms Ala, Alb ... A5a, A5b are then reset among the working stations Sl to Ss by an operation of the arm driving means 65. Accordingly, there is nothing left to constitute an obstacle on the working sta-tions Sl to Ss~ and the works W are subjected to , 9~
press working according to the descending operation of the elevator 7 and the upper dies 4l to 4s.
Thus, the works W are conveyed in sequence from the first working station Sl to the fifth work-ing station Ss as repeating press work and convey-ance, thereby completing a series of press working.
In such conveyor 9, the arms ~la, Alb ... A5a, A5b move to ~eir standby positions among the working stations Sl to Ss at the time of press working, therefore as compared with the case wherein the arms are to be shunted aside hitherto, the time required for -the move can be shortened considerably, and the press working operation need not be interrupted, thus assuring a smooth press working operation. Further, the work W is held on the paired arms Ala, Alb ... A5a, A5b, therefore the work W can be held stably. In addition, the intervals between the arms Ala and AIb; ... A5a and A5b and between the arms Ala and A2b; ... A4a and A5b on both sides of the stay 12 are adjustable through controlling the arm driving means 65, therefore the work W can be held securely by controlling the holding position of the arms accord-ing to a shape of the work W, and further the inter-vals among the working stations S to Ss can be set relatively small.
Also, the point at which the conveyor 9 starts . , .
:
operating is adjustable through controlling the amount of projection of the Gen~va arms 22 rorrl thc second rotating shaft 34, and hence a conveyance starting point can be adjusted easily in response to a change in shape of the work W, thereby enhancing the rate of operation of the press 1.
, Furthermore, since both the transfer bars lO, 11 are coupled toge~ler through the stays 12 among the work-ing stations Sl to Ss~ the transfer bars 10, ll can move synchronously and a vibration can be pre-vented.
Construction of the part for feeding the works W to the first working station S~ is omitted for simplification of the description in the above embodiment, however, an arm similar in con-struction to those corresponding to the working stations S~ to Ss may be provided for the part.
Further in the above embodiment, the descrip-tion refers to the case where the work W is held on two arms, however, in case the work W can be held on one arm, arms A1 to A5 may be disposed as in the second embodiment shown in Fig. 8. In this case, intervals among the working stations Sl to Ss are not necessarily equalized, and intervals between the second and third working stations S 2 and S 3 and .
: . .
the four~h and fifth working stations S 4, S 5 can be made smaller by, for example, letting the arms A1, A2 and A3, A4 be on standby between the firs~ and second working stations Sl, S 2 and the third and fourth working stations S3, Sl,.
Further, a plurality of arms can be disposed on one side of the stay 12.
Fig. 9 to Fig. 11 represent a third embodiment of this invention, wherein parts corresponding to each embodiment described above are identified by the same reference characters.
In the press 1, the first to third working sta-tions Sl, S 2, S 3 are set at regular intervals in the conveying direction 2 of the worlcs W. For exam-ple, the first working station Sl is for drawing, the second working station S2 is for piercing and finishing, and the third working station S3 is for trimming and splitting.
A carrying-in stand IS is provided in the rear of the pedestal 5 and the bolster 6 in the convey-ing direction 2, and a discharge shoot ES is pro-vided in the front of the pedestal 5 and the bolster 6.
The arms Ala, Alb are laid between both the transfer bars 10, 11 correspondingly to the carrying-in stand IS longitudinally in the conveying dlrec-tion 2, and the remaining arms A2a, A2b ... A4a, A4b are also laid between both the transfer bars 10, 11 longitudinally in the conveying direction 2 of the corresponding first to third working stations Sl to S3.
In Fig. 11, guide plates 88 extending hori-zontally in the conveying direction 2 are supported by struts 89 under the transfer bars 10, 11, and the transfer bars 10, 11 are placed on the guide plates 8a through rollers 87, respectively.
The arms Ala, Alb ... A4a, A4b are provided with sucking means (not shown), and hence are capable of holding the work W on the carrying-in stand IS and -the working stations S~ to S3 after moving in the direction away from the stay 12. How-ever, in the case of arms Ala, Alb, A2a, A2b cor-responding to the carrying-in stand IS and the first working station Sl, a better stability will be ob-tained if the arms are designed to move only a small distance ~l and to hold an end portion of the work W
by the sucking means. But in the case of arms A3a, A3b, A4a, A4b corxesponding to the second and third work-ing stations S2, S3,making the moving distance ~2 rel-atively large may lead to a better stability.
Now, therefore, the arms ~la, Alb, A2a, A2b are moved by an arm driving means 65' for the relatively small distanceQl,and the arms A3a, A3b, A4a, A4b are moved by the arm driving means 65' for the relatively large moving distance Q2.
The arm driving means 65' is provided with a pair of driving racks 66 disposed movably on the transfer bars 10, 11 in the conveying direction 2, racks 67 provided on the arms Ala to A4a on forward side in the conveying direction 2 and opposite to the driving racks 66, racks 68 provided on the arms Alb to A4b on rear side in the conveying direction 2 and opposite to the driving racks 66, pinions 69 interposed between the racks 67 and the driving racks 66 at positions corresponding to the carrying-in stand IS and the first working station S~, pinions 90 interposed between the racks 67 and the driv-ing racks 66 at positions corresponding to the sec-ond and third working stations S2, S3, pairs of pinions 70, 71 interposed between the racks 68 and driving racks 66 at positions corresponding to the carrying-in stand IS and the first working station Sl, pairs of pinions 91, 92 interposed between the racks 68 and the driving racks 66 at positions corresponding to the second and third working stations '' . - 23 -~L~69;~1~
S2, S3, and driving gears 72 journaled on end por-tions of the transfer baxs 10, 11 and engage~ with the driving racks 66. The driving gears 72 are driven to rotate reversib]y by a driving source (not shown) such as pulse motor or the like.
.. . I
The driving racks 66 move forward or bac]cward in the conveying direction 2 according to a rota-tional operation of the driving gears72. Move-ment of the driving racks 66 is transferred to the arms Ala to A4a through the pinions 69, 90 and the racks 67,and the arms Ala to A4a move in a direction counter to the driving racks 66. Further, the movement of the driving racks 66 is transferred to the other arms Alb to A4b through the pinions 70, 71, 91, 92 and the racks 6~, and the arms Alb to A4b move in ..
the same direction as the driving racks 66. Accord-ingly, the arms Ala, A2b, for example, on both sides of the stay 12 are vable by the arm driving means 65' in the direction counter to each other or in the direction coming apart from or coming near to each other.
Furthermore, as shown in Fig. 11, the pinion 90 comprises a gear part 90a engaging with the driving rack 66 and a gear part 90b engaging with the rack 67 and ~: larger in size than the gear part 90a,these parts being formed coaxi-ally and in two stages vertically. The pinion 90 drives the rack 67 in the direction counter to the driving racks 66 at a ving distance larger than that of the latter. Also, one of the paired pinions 91 92 comprises gear parts in two stages vertically likewise in the case of ~e pinion 90 and drives the rack 68 at a moving distance larger than that of the driving racks 66 in the same direction as the driving racks 66.
Accordingly, while the arms Ala, Alb, A2a, A2b can move by the distance ~l in response to the movement of the driving racks 66 by the same distance due to the driving gear 72, the arms A3a, A3b, A4a, A4b can move by the distance Q2 which is larger than the distance ~l.
-According to this third embodiment, tne moving distance is differentiated between the group of arms Ala, Alb, A2a, A2b and the group of arms A3a, A3b, A4a, A4b correspondingly to the shape of work W to be held, therefore the work can be held more stably at an optimum position.
Although in the above embodiment a combined structure of rack and pinion is illustrated as the arm driving means 65', there may alternately be employed a cylinder, link motion or the like.
Fig. 12 to Fig. 16 represent a fourth embodi-ment of this invention, wherein parts corresponding to the preceding embodiments are identified by the same reference characters.
.. ~
.','' ;, _ 25 ~
A conveyor 9' provided additionally on -the press 1 comprises a pair of transfer bars 10, 11 disposed in parallel with the conveying direc~ion 2 on both sides of the first to third working sta-tions Sl to S3, first to fourth arms Al to A4 laid between the transfer bars 10, 11, and handling mechanisms 95mounted on the arms Al to A4.
The first arm Al is provided horizontally to extend at right angles to the conveying direction 2, connecting between rear ends of both the transfer bars 10, 11, and the handling mechanism 95 mounted on the first arm Al functions to convey the work W on the carr~ing-in stand IS
to the first working station Sl. Also, in order to convey the work at the first working station Sl to the second working station S2, the work W at the second working station S2 to the third working sta-tion S3, and the work W at the third working sta- .
tion S3 to the discharge shoot ES,respectively,by the handling mechanism 95 mounted thereon, the sec-ond to fourth arms A2 to A4 are provided between the transfer bars 10, 11 in parallel with the first arm Al. Further, the fifth arm As is provided be-tween front ends of the transfer bars 10, 11, how-ever, the handling mechanism 95 is not mounted on : !
12~:;9Xl~
the fifth arm As.
In Fig. 1~, guide plates 88 extending hor-izontally in the conveying direction 2 are supported by struts 89 under both the transfer bars 10, 11, and the transfer bars 10, 11 are placed on the guide pla-tes 88 through wheels 87.
Each handling mechanism 95 comprises a pair of support rods 96a, 96b pivoted on each of ~e first to fourth arms Al to A4 with an interval therebetween longitudinally,suctlon means 97 provided on both ends of the support rods 96a, 96b as holding means, and turn driving ~eans 98 provided on the arms Al to A4 for turning the support rods 96a, 96b.
A pair o~ turning shafts 99a, 99b with the lower ends projecting downward of the arms Al to A4 are borne at longitudinally spaced portions and rotatably around an axis of the first to fourth arms Al to A4, and longitudinal centers of the support rods 96a, 96b are fixed to lower ends of the turning shafts 99a, 99b. Accordingly, the support rods 96a, 96b are rotatable around the vertical axis. Each of the ... . .
ends of the support rods 96a, 96b has paired'suct lon means 97 provided thereon.
The turn driving means 98 is incorporated in each the arms Al to A4, comprising a hydraulic cyl-':
_ 27 ~
inder 100 adapted for expansive operation in a longitudinal direction of the arms ~, to A", turning arms 101a, 101b fixed to upper portions of the turning shafts 99a, 99b in the arms Al to A4 and extending radially outward of the turning shafts 99a, 99b, and a driv-ing rod 103 coupled coaxially with a piston rod 102 of the hydraulic cylinder 100 and pinned to noses of the turning arms lOla, 101b.
Owing to such turn driving means 98, an expansive operation of the hydraulic cylinder 100 causes both the support rods 96a, 96b to be driven and turned between an enclosed state parallel with the arms Al to A4 and a projecting state orthogonal to the arms A~ to A4 and projecting to both sides of the arms through the driving rod 103, the turning arms 101a, 101b and the turning shafts 99a, 99b.
Referring next to operation of this embodiment, the transfer bars 10, 11 take standby positions and the arms Al to As are located among the carrying-in stand IS, the working stations Sl to S3 and the discharge shoot ES at the time of press working by the lower dies 3I to 3 3 and the upper dies 4 to 4 3 in the working stations Sl to S 3 . That is, the first arm A~ is positioned in the rear of the carrying-in stand IS in the conveying direction 2, the second to fif.th arms A2 to A4 are positioned be-tween the carrying-in stand IS and the first working station Sl, the first and second working stations Sl, S2, the second and third working stations S2, S3, and the third working station S 3 and the discharge shoot ES, respectively. In such state, the handling mechanisms 95mounted on the first to fourth arms A
to A4 each has the support rods 96a, 96b enclosed in parallel with the arms Al to A4.
When the press working by the lower dies 3~ to
8 is a general schematic side sectional view of a second embodiment which corresponds to Fig. l; Fig.
9 to Fig. 11 represent a third embodiment of this invention, wherein Fig. 9 is a general schematic side sectional view, Fig. 10 is an enlarged plan view of a main part oE Fig. 9, Fig. 11 is a sec-tional view ta]cen on line XI - XI of Fig. 10; Fig.
12 to Fig. 16 represent a fourth embodiment of this invention, wherein Fig. 12 is a general schematic side view, Fig. 13 is an enlarged sectional fiew of a main part of Fig. 12, Fig. 14 is an enlarged sec-tional view taken on line XIV - XIV of Fig. 13, Fig.
15 is a sec-tional view taken on line XV - XV of Fig.
14, Fig. 16 is a sectional view taken on line XVI -`:
::
- ;, , l~Y~
~VI of Fig. 15; Fig. 17 to Fig. 21 represent a fifth embodiment of this invention, wherein ~ig. 17 is a general schematic side sectional view, Fig. 1~ is an enlarged plan view of a main part of Fig. 17, Fig. 19 is an enlarged sectional view taken on line XIX - XIX of Fig. 18, Fig. 20 is a sectional view taken on line XX - XX of Fig. 19, Fig. 21 is a sec-tional view taken on line XXI - XXI of ~ig. 20.
DE:TAILED DE:SCRIPTION OF PI~EFEI~I<ED EMBODIMEI~TS
Referring now in detail to the drawings, in Fig. 1 which shows a first embodiment of this invention, a plurality oE, for example, first to fiEth working sta-tions Sl to Ss in this embodiment are set at regular intervals alony a direction 2 in which a worlc W is conve~ed on a plastic working machine,for example,on a press 1, and lower dies 31 to 35 and upper dies ~ to 45 for pressing the work W in collaboration are disposed on the working sta-tions Sl to Ss~ respectively. That is, the lower dies 31 to 35 are fixed at regular intervals on a bolster 6 on a pedestal 5 in the conveying direc-tion 2, and the upper dies 41 to 45 are suppor-ted on a holder 3 fixed on an elevator 7 corresponding-ly to the lower dies 31 to 35. A conveyor 9 is provided additionally on the press 1, and after a press working between the lower dies 31 to 35 and the up-per dies ~I to ~5 according -to a descent of the ele-vator 7, the conveyor 9 operates to convey the work W in sequence to the next working sta-tion in the conveying direction 2.
The conveyor 9 has a pair of transfer bars 10, 11 disposed in parallel with the conveying direction 2 on both sides of -the wor]cing sta-tions Sl to S5, and a plurality of arms ~la, Alb ... A5a, A5b laid between the transfer bars 10, 11 and movable longi-tudinally in the conveving direction 2. The work W
is conveyed according to displ~cements of the arms Ala, Alb 5a, ASb and the transfer baxs 10, 11, however, the worlcing stations Sl to Ss are similar to each other in their construction, and hence a description will be given of the Eirst worlcing st~-tion 51 and its neigh-borhood with reference to the drawings.
In also reEerring to Fig. 2, bo-th the transfer bars 10, 11 are provided to extend from the first working station Sl to the fifth work-ing station Ssl and the transfer bars 10, 11 are coupled to each other through stays 12 located among the work-ing stations Sl to Ss. Further, each stay 12 is disposed so as to come at the center among the work-ing stations Sl to Ss~ when both the transfer bars 9~9 10, 11 are kept s-ta-tionary at the time of press working.
In referring further to Fig. 3 and Fig. ~, guide rails 13 extending horizontally in the convey-ing direction 2 are disposed on both outsides of the transfer bars 10, 11, and each guide rail 13 is sup-ported by a strut 14 provided vertically on a floor surface. Travelling plates 16 are placed on both the guide rails 13 through a pair of wheels 15, and a truck 18 is constituted by coupling both the trav-elling plates 16 through a connec-ting rod 17. The truck 18 is capable of running on both -the guide rails 13 longitudinally in the conveying direction 2, and is arranged on the guide rails 13 correspond-ingly at least to both ends of the transfer bars 10, 11. Then, guide rods l9 are provided vertically near bo-th ends oE the connecting rod 17, a cylin-drical coupllng member 20 is inser-ted movably up and down in each guide rod 19, and these coupling members 20 are coupled -to end portions of the trans-fer bars 10, 11. Consequently, both the transfer bars 10, 11 are ~vable longi-tudinally in the convey-ing direction 2 by running and driving the .truclc 18 on the guide rails 13 in the same direction; Both the transfer bars lO, ll are 9;~19 also capable o moving vertically along the guide rods 19.
Next will be describe~ construction of a driv-ing means for driving the transfer bars 10, 11 with reference to Fig. 5 and Fig. 6. Driving means 21 for the transfer bars 10, 11 is provided with a mechan-ism for moving the transfer bars 10, 11 horizontally and another mechanism for moving both the transfer bars 10, 11 vertically. To move the transfer bars 10, 11 horizontally, the driving means 21 is pro-vided with Geneva arms 22, a Geneva plate 24 hav-ing grooves 23 for receiving the Geneva arms 22 therein, and a transfer mechanism 25 for transforming a ro-tational motion of the Geneva plate 24 into a hor-izontal reciprocating motion and transferring it to the transfer bars 10, 11.
A pedestal 29 with a pair of side plates 27, 28 provided vertically at an interval therebetween on a baseplate 26 is fixed on the floor surface on an upper side than both the transfer bars 10, 11 in the conveying direction 2, and a bevel gear 31 is fixed on the end of a first rotating shaft 30 which is ~orne rotatably on the one side plate 27 and projects outward of the side plate 27. On the other hand, a bevel gear 33 is fixed on a transfer shaft 32 extended ~ ~ .3 from a driving source (not shown) for driving the elevator 7, and the bevel gear 33 is engaged with the bevel gear 31. Second and third rotat-ing shafts 34, 35 parallel with the first rotating shaft 30 are borne rotatably between both side plates 27, 2~ of the pedestal 29. ~ first gear 36 is fixed on an end portion of the f.irst rotating shaft 30 projecting inward from the one side plate 27, and this gear 36 is engaged with a second gear 37 fixed on the second rotating shaft 34. Ac-cordingly, a rotation driving force -transferred to the first rotating shaft 30 is transferred further to the second rotating shaft 34.
A pair of disklike rotary plates 38, 39 facing each other with an axial interval therebetween are fixed on mid-way of the second rotating shaft 34. Then, disklike adjusting plates 40, 41 are borne rotatably on the second rotating shaft 34 axially outwardly of respective plates 38, 39 and are rotatable relatively to the rotary plates 38, 39 and the second rotating shaft 34. A cylindrical regulating member 42 is interposed between the second gear 37 and the one adjusting plate 40, and another cylindrical regulat-ing member 44 is interposed between a support plate 1~ ~i9~ ~
43 fixed on ~e second rotating shaft 34 and opposed other ad-justing plate 41. Accordingly, both the adjusting plates 40, 41 are kept from moving axially of the second rotating shaft 3~, and are in sliding contact with the rotary plates 38, 39, respectively.
The Geneva arms 22 are disposed at plural por-tions,for example,at three portions, at regular in-tervals in a circumferential direction of both the rotary plates 38, 39 and both the adjusting plates 40, 41. Roller 45 having an axis of rotation parallel with the axis of the second rotating shaft 34 is journaled in a loose end of each Geneva arm 22. Then, a base end of each Geneva arm 22 is en-gaged with both the rotary plates 38, 39 movably in the radial direction, and a projection 46 is provided on the base end and is engaged with a circular arc slit 47 perforated in each of the adjusting plates 40,41 and trend-ing radially inward at one circumferential end thereof.
Accordingly, when the adjusting plates 40, 41 are displaced angularly relative to the ro~ar,v Plates 38, 39, each Geneva arm 22 is forced to moves radlal Iy of the rotary plates 38, 39 and the adjusting plates 40, 41 and the amount of projec-tion of the roller 45 at its loose end from the second rotating shaft 34 will change.
~ X~9~1~
To drive and displace the adjusting plates 40, 41 at a relative angle to the rotary plates 38, 39, there is provided a sector gear 48 on one part of the circumfexence of the other adjusting plate 41, and a driving gear 49 engaging with the sector gear 48 is fixed on output shaf-t 50 of a pulse motor PM supported fixedly on the support plate 43. Ac-cordin~ly, upon actuating the pulse motor PM, the other adjusting plate 41 is displaced at a relative angle to the rotary plates 38, 39, each Geneva arm 22 comes near to or apart from the second rotating shaft 34, accompanied by displacement of the one adjusting plate 40 at a relative angle to the rotary plates 38, 39.
The Geneva plate 24 is fixed on midway of the third rotating shaft 35 at a position corresponding to the rotary plates 38, 39. 1~ plurality of, for example, four, grooves 23 are extended radially on the Geneva plate 24 with circumferenti.ally regular intervals therebetween, and each Geneva arm 22 can be fitted in each groove 23. In accordance with the rotation of second rotating shaft 34, the rotary plates 38, 39 are rotated to cause concurrent rotation of each Geneva arm 22 and adjusting plates 40, 41, and then the Geneva arm 22 is fitted in the groove 23, rotating the Geneva plate 24 and the third rotating shaft 35. Further, in accordance as each Geneva arm 22 projects large-ly from -the second rotating shaft 34, t~le roller 45 on the loose end of the Geneva arm 22 comes in con-tact with a side edge of the groove 23 on an upper side of the direction in which the Geneva plate 24 rotates, and the Geneva plate 24 is operated to run counter to a normal direction of rotation. Conse-quently, the third rotating shaft 35 can be delayed for rotational operation from s-tart in actuation of a driving source for the elevator 7, namely from start in operation of the elevator 7, by the time accord-ing to the rate of projection of the Geneva plate 22, and the delay time can be adjusted by control-ling the angular displacement of the adjusting plates 40, 41 relative to the rotary plates 38, 39.
A rotational operation of the Geneva plate 24, or a rotational operation of the third rotating shaft 35 is transferred to both the transfer bars 10, 11 through the transfer mechanism 25. The trans-fer mechanism 25 comprises a third gear 51 fixed on the third rotating shaft 35, a cam shaft 52 disposed rotatably around an axis parallel with the third rotating shaft 35, a fourth gear 53 engaging with the third gear 51 and fixed on the cam shaft 52, a pair of cams 54 fixed on both ends of the cam shaft 52, a link shaft 55 disposed rotatably around an axis parallel with the cam shaft 52, a pair of swing arms 57 each having one end fixed on the link shaft 55 and the other end journaling a cam roller 56 which is in slide con-tact with ~he associated cam 54, a pair of first links 58 each having one end fixed on the link shaft 55, and a pair of second links 60 with one end of each coupled to the other end of the first link 58 through a pin 59 parallel with the link shaft 55 and the other end coupled to the truck 18. The cam shaft 52 and the link shaft 55 are borne rotatably on a support mem-ber 61 fixed on the floor surface, respectively.
In the transfer mechanism 25, the third rotat-ing shaft 35 is driven to rotate from the Geneva arm 22 through the Geneva plate 24 in accordance with an operation of the elevator 7, namely the up-per dies 4I to 4 5, and further the the cam 54 is driven to rotate by engagement of the third gear 51 with the fourth gear 53. Since the cam roller ,.
56 is in sliding contact with the cam 54 rotating along with the cam shaft 52, the swing arm 57 swings and the link shaft 55 rotates reciprocatingly in a certain range, thus shaking the first link shaft 58. Consequently, the second link 60 recip-rocates longitudinally thereof, and both the trans-fer bars 10, 11 reciprocate longitudinally in the conveying direction 2 on the guide rails 13 through the truck 18.
To move the transfer bars 10, 11 vertically, there is provided a hydraulic cylinder (not shown) or the like between the connecting rod 17 of the truck 18 and both the transfer bars 10, 11, and thus the transfer bars 10, 11 are movable vertically according to an operation of the hydraulic cylinder.
Thus, the transfer bars 10, 11 are moved hori-zontally and vertically in the conveying direction 2 by the driving means 21, drawing a rec~angular path within a vertical plane as a whole.
In referring again to Fig. 2, the arms Ala, Alb are laid between the transfer bars 10, 11 cor-respondingly to the first working station Sl in the conveying direction 2, and the remaining arms A2a, A2b ... A5a, A5b are also laid between the transfer bars 10, 11 longitudinally in the conveying direc-tion 2 of the corresponding working stations S 2 to Ss. ~ccordingly, in adjacent working stations, a handling arm on the forward side in the conveying direction 2 and a handling arm on the rear side in ,.... . .
~9;~1~
that direction 2 are disposed on both sides of each stay 12. That is, for example, the arm Ala on the forward side in the conveying direction 2 in the first working station Sl and the arm A2b on the rear side in ~he conveying direction 2 in the sec-ond working station S2 are disposed on both sides of the stay 12.
In also .referring to Fig. 7, a guide slot 52 extending in the conveying direction 2 is perforat.ed in each the transfer bars 10, 11 correspondignly to the working stations Sl to Ss.
Then, a projection 64 projecting downward and hav-ing a locki.g part 63 at the nose is provided on the arms Ala, Alb ... A5a, A5h. ~nd each projection 64 is inserted in the guide slo~ 62 to have the locking part 63 locked on the ~ransfer bars 10, 11.
Accordingly, the~arms Ala, Alb ... A5a, A5b can be mo~ed on the transfer bars 10, 11 through the guide slot 62 in the conveying direction 2.
An arm driving means 65 for driving such arms Ala, Alb ... ~5a,.A5b comprises a pair of driving racks 66 disposed movably in the conveying direc-tion 2 on sides of the transfer bars 10, 11, racks 67 provided on the arms Ala to A5a on the forward side in the conveying direction 2 in the working -- 1~ --stations Sl to Ss and opposite -to the driving racks 66, racks -68 provided on the arms Alb to A5b on the rear siae in the conveying direction 2 in the work-ing stations Sl to Ss and opposite to the driving racks 66, single pinions 69 interposed between the racks 67 and the driving racks 66 and journaled on the transfer bars 10, 11, pairs of pinions 70, 71 interposed between -the racks 68 and the driving racks 66, respectively, and journaled on the transfer bars 10, ll, driving pinions 72 journaled on end por-tions of both the transfer bars 10, 11 and engaging with the driving racks 66, an arm driving source 73 fixed and disposed on the floor surface, and a power transfer mechanism 75 coupling a rotating shaft 74 of-each driving pinion 72 to the arm driving source 73.
The driving rack 66 is provided extendedly in the conveying direction 2 and placed on a guide shelf 76 provided projectingly on ~ sicle wall of each of the transfer bars lO, ll. A guide slot 77 extending in the conveying direction 2 is perforated in side of each clriving rack 66, a locking pin 78 provided on the transfer bars 10, 11 is inserted in the guide slot 77, and a locking part 79 provided on a tip of the locking pin 78 is locked on the driving rack , . - 15 -.:
l~ti9~
66. Accordingly, both the driving racks 66 can be moved longitudinally in the conveying direction 2 while sliding on the sides of the -transfer bars 10, 11 .
The ar~ driving source 73 is, for example, a pulse motor, and the power transfer mechanism 75 coupl-ing an output shaft 80 of the driving source 73 to ~e rotating shaft 74 of the driving pinion 72 comprises a transfer cylinder 82 coupled to the outpu-t shaft 80 through a universal joint 81, and a transfer shaft 84 fitted in and spline~connected to the transfer cylinder 82 while being coupled to the rotating shaft 74 through a univer-sal joint 83. Consequently, the power transfer mechanism 75 is capable of transferring a rotation driving force from the arm driving source 73 to the driving pinion 72 through the rotating shaft 74 ir-respective of horizontal and/or vertical movement of the transfer bars 10, 11.
In the arm driving means 65, the driving racks 66 move forward or backward in the conveying direc-tion 2 according to a rotational operation of the driving pinions 72. Operation of the driving racks 66 is transferred to the arms Ala to A5a through the pinions 69 and the racks 67 and thus the arms Ala to A5a move in a direction counter to the driving racks 66.
~ 3 Also, the operation of the driving racks 66 is transferred to the arms Alb to A5b througn the paired pinions 70,71 and the racks 68, and the arms Alb to A5b move in the same direction as the driving racks 66. Accordingly, the arms, for example, Ala, A2b on both sides of the stay 12 are moved by the driving means 65 ln the directions counter to each other, or in the direction coming near to or apart from each other.
A control means 85 is connected to the arm driving source 73 for controlling the direction of rotation of the arm driving source 73 in such a manner that the arms Ala,Alb ...
A5a,A5b will be on standby among the working stations Sl to S5 at the time of press working by the lower dies 31 to 35 and the upper dies 41 to 45 and also the arms Ala,Alb ... A5a,A5b will move onto the corresponding working stations Sl to S5 at the time of conveyance starting.
Further, suction such as, for example, those employed in the later described fourth and fifth embodlments, are provided on lower portions of the arms Ala,Alb ... A5a,A5b, and the work W
is held on the suctlon means.
Operation of this embodiment will next be described.
After press working by the lower dies 31 to 35 and the upper dies 41 to 45 in the working sta-tions Sl to Ss, the conveyor 9 is actuated and the work W on the working stations Sl to Ss is conveyed to the ne~t working stations S 2 to Ss and a dis-charge position. That is, when the elevator 7 and the upper dies 4I to 45 integral therewith start ascending, first the arm dxiving means 65 is actu-ated and the corresponding arms Ala, Alb ... A5a, A5b are moved onto the working stations Sl to Ss.
Next, when the corresponding works are held on the arms Ala, Alb ... A5a, A5b, both the transfer bars lO, 11 are operated to ascend by the driving means 21, move horizontally forward in the conveying di-rection 2 to convey the works W onto the next work-ing stations and then descend. The works W are thus placed onto the corresponding working stations by releasing each work W from being held on the arms Ala, Alb ... A5a, A5b. Both the transfer bars 10, 11 then move to the rear side in the conveying di-rection 2, and the arms Ala, Alb ... A5a, A5b return to the working stations Sl to S 5 as they were. The arms Ala, Alb ... A5a, A5b are then reset among the working stations Sl to Ss by an operation of the arm driving means 65. Accordingly, there is nothing left to constitute an obstacle on the working sta-tions Sl to Ss~ and the works W are subjected to , 9~
press working according to the descending operation of the elevator 7 and the upper dies 4l to 4s.
Thus, the works W are conveyed in sequence from the first working station Sl to the fifth work-ing station Ss as repeating press work and convey-ance, thereby completing a series of press working.
In such conveyor 9, the arms ~la, Alb ... A5a, A5b move to ~eir standby positions among the working stations Sl to Ss at the time of press working, therefore as compared with the case wherein the arms are to be shunted aside hitherto, the time required for -the move can be shortened considerably, and the press working operation need not be interrupted, thus assuring a smooth press working operation. Further, the work W is held on the paired arms Ala, Alb ... A5a, A5b, therefore the work W can be held stably. In addition, the intervals between the arms Ala and AIb; ... A5a and A5b and between the arms Ala and A2b; ... A4a and A5b on both sides of the stay 12 are adjustable through controlling the arm driving means 65, therefore the work W can be held securely by controlling the holding position of the arms accord-ing to a shape of the work W, and further the inter-vals among the working stations S to Ss can be set relatively small.
Also, the point at which the conveyor 9 starts . , .
:
operating is adjustable through controlling the amount of projection of the Gen~va arms 22 rorrl thc second rotating shaft 34, and hence a conveyance starting point can be adjusted easily in response to a change in shape of the work W, thereby enhancing the rate of operation of the press 1.
, Furthermore, since both the transfer bars lO, 11 are coupled toge~ler through the stays 12 among the work-ing stations Sl to Ss~ the transfer bars 10, ll can move synchronously and a vibration can be pre-vented.
Construction of the part for feeding the works W to the first working station S~ is omitted for simplification of the description in the above embodiment, however, an arm similar in con-struction to those corresponding to the working stations S~ to Ss may be provided for the part.
Further in the above embodiment, the descrip-tion refers to the case where the work W is held on two arms, however, in case the work W can be held on one arm, arms A1 to A5 may be disposed as in the second embodiment shown in Fig. 8. In this case, intervals among the working stations Sl to Ss are not necessarily equalized, and intervals between the second and third working stations S 2 and S 3 and .
: . .
the four~h and fifth working stations S 4, S 5 can be made smaller by, for example, letting the arms A1, A2 and A3, A4 be on standby between the firs~ and second working stations Sl, S 2 and the third and fourth working stations S3, Sl,.
Further, a plurality of arms can be disposed on one side of the stay 12.
Fig. 9 to Fig. 11 represent a third embodiment of this invention, wherein parts corresponding to each embodiment described above are identified by the same reference characters.
In the press 1, the first to third working sta-tions Sl, S 2, S 3 are set at regular intervals in the conveying direction 2 of the worlcs W. For exam-ple, the first working station Sl is for drawing, the second working station S2 is for piercing and finishing, and the third working station S3 is for trimming and splitting.
A carrying-in stand IS is provided in the rear of the pedestal 5 and the bolster 6 in the convey-ing direction 2, and a discharge shoot ES is pro-vided in the front of the pedestal 5 and the bolster 6.
The arms Ala, Alb are laid between both the transfer bars 10, 11 correspondingly to the carrying-in stand IS longitudinally in the conveying dlrec-tion 2, and the remaining arms A2a, A2b ... A4a, A4b are also laid between both the transfer bars 10, 11 longitudinally in the conveying direction 2 of the corresponding first to third working stations Sl to S3.
In Fig. 11, guide plates 88 extending hori-zontally in the conveying direction 2 are supported by struts 89 under the transfer bars 10, 11, and the transfer bars 10, 11 are placed on the guide plates 8a through rollers 87, respectively.
The arms Ala, Alb ... A4a, A4b are provided with sucking means (not shown), and hence are capable of holding the work W on the carrying-in stand IS and -the working stations S~ to S3 after moving in the direction away from the stay 12. How-ever, in the case of arms Ala, Alb, A2a, A2b cor-responding to the carrying-in stand IS and the first working station Sl, a better stability will be ob-tained if the arms are designed to move only a small distance ~l and to hold an end portion of the work W
by the sucking means. But in the case of arms A3a, A3b, A4a, A4b corxesponding to the second and third work-ing stations S2, S3,making the moving distance ~2 rel-atively large may lead to a better stability.
Now, therefore, the arms ~la, Alb, A2a, A2b are moved by an arm driving means 65' for the relatively small distanceQl,and the arms A3a, A3b, A4a, A4b are moved by the arm driving means 65' for the relatively large moving distance Q2.
The arm driving means 65' is provided with a pair of driving racks 66 disposed movably on the transfer bars 10, 11 in the conveying direction 2, racks 67 provided on the arms Ala to A4a on forward side in the conveying direction 2 and opposite to the driving racks 66, racks 68 provided on the arms Alb to A4b on rear side in the conveying direction 2 and opposite to the driving racks 66, pinions 69 interposed between the racks 67 and the driving racks 66 at positions corresponding to the carrying-in stand IS and the first working station S~, pinions 90 interposed between the racks 67 and the driv-ing racks 66 at positions corresponding to the sec-ond and third working stations S2, S3, pairs of pinions 70, 71 interposed between the racks 68 and driving racks 66 at positions corresponding to the carrying-in stand IS and the first working station Sl, pairs of pinions 91, 92 interposed between the racks 68 and the driving racks 66 at positions corresponding to the second and third working stations '' . - 23 -~L~69;~1~
S2, S3, and driving gears 72 journaled on end por-tions of the transfer baxs 10, 11 and engage~ with the driving racks 66. The driving gears 72 are driven to rotate reversib]y by a driving source (not shown) such as pulse motor or the like.
.. . I
The driving racks 66 move forward or bac]cward in the conveying direction 2 according to a rota-tional operation of the driving gears72. Move-ment of the driving racks 66 is transferred to the arms Ala to A4a through the pinions 69, 90 and the racks 67,and the arms Ala to A4a move in a direction counter to the driving racks 66. Further, the movement of the driving racks 66 is transferred to the other arms Alb to A4b through the pinions 70, 71, 91, 92 and the racks 6~, and the arms Alb to A4b move in ..
the same direction as the driving racks 66. Accord-ingly, the arms Ala, A2b, for example, on both sides of the stay 12 are vable by the arm driving means 65' in the direction counter to each other or in the direction coming apart from or coming near to each other.
Furthermore, as shown in Fig. 11, the pinion 90 comprises a gear part 90a engaging with the driving rack 66 and a gear part 90b engaging with the rack 67 and ~: larger in size than the gear part 90a,these parts being formed coaxi-ally and in two stages vertically. The pinion 90 drives the rack 67 in the direction counter to the driving racks 66 at a ving distance larger than that of the latter. Also, one of the paired pinions 91 92 comprises gear parts in two stages vertically likewise in the case of ~e pinion 90 and drives the rack 68 at a moving distance larger than that of the driving racks 66 in the same direction as the driving racks 66.
Accordingly, while the arms Ala, Alb, A2a, A2b can move by the distance ~l in response to the movement of the driving racks 66 by the same distance due to the driving gear 72, the arms A3a, A3b, A4a, A4b can move by the distance Q2 which is larger than the distance ~l.
-According to this third embodiment, tne moving distance is differentiated between the group of arms Ala, Alb, A2a, A2b and the group of arms A3a, A3b, A4a, A4b correspondingly to the shape of work W to be held, therefore the work can be held more stably at an optimum position.
Although in the above embodiment a combined structure of rack and pinion is illustrated as the arm driving means 65', there may alternately be employed a cylinder, link motion or the like.
Fig. 12 to Fig. 16 represent a fourth embodi-ment of this invention, wherein parts corresponding to the preceding embodiments are identified by the same reference characters.
.. ~
.','' ;, _ 25 ~
A conveyor 9' provided additionally on -the press 1 comprises a pair of transfer bars 10, 11 disposed in parallel with the conveying direc~ion 2 on both sides of the first to third working sta-tions Sl to S3, first to fourth arms Al to A4 laid between the transfer bars 10, 11, and handling mechanisms 95mounted on the arms Al to A4.
The first arm Al is provided horizontally to extend at right angles to the conveying direction 2, connecting between rear ends of both the transfer bars 10, 11, and the handling mechanism 95 mounted on the first arm Al functions to convey the work W on the carr~ing-in stand IS
to the first working station Sl. Also, in order to convey the work at the first working station Sl to the second working station S2, the work W at the second working station S2 to the third working sta-tion S3, and the work W at the third working sta- .
tion S3 to the discharge shoot ES,respectively,by the handling mechanism 95 mounted thereon, the sec-ond to fourth arms A2 to A4 are provided between the transfer bars 10, 11 in parallel with the first arm Al. Further, the fifth arm As is provided be-tween front ends of the transfer bars 10, 11, how-ever, the handling mechanism 95 is not mounted on : !
12~:;9Xl~
the fifth arm As.
In Fig. 1~, guide plates 88 extending hor-izontally in the conveying direction 2 are supported by struts 89 under both the transfer bars 10, 11, and the transfer bars 10, 11 are placed on the guide pla-tes 88 through wheels 87.
Each handling mechanism 95 comprises a pair of support rods 96a, 96b pivoted on each of ~e first to fourth arms Al to A4 with an interval therebetween longitudinally,suctlon means 97 provided on both ends of the support rods 96a, 96b as holding means, and turn driving ~eans 98 provided on the arms Al to A4 for turning the support rods 96a, 96b.
A pair o~ turning shafts 99a, 99b with the lower ends projecting downward of the arms Al to A4 are borne at longitudinally spaced portions and rotatably around an axis of the first to fourth arms Al to A4, and longitudinal centers of the support rods 96a, 96b are fixed to lower ends of the turning shafts 99a, 99b. Accordingly, the support rods 96a, 96b are rotatable around the vertical axis. Each of the ... . .
ends of the support rods 96a, 96b has paired'suct lon means 97 provided thereon.
The turn driving means 98 is incorporated in each the arms Al to A4, comprising a hydraulic cyl-':
_ 27 ~
inder 100 adapted for expansive operation in a longitudinal direction of the arms ~, to A", turning arms 101a, 101b fixed to upper portions of the turning shafts 99a, 99b in the arms Al to A4 and extending radially outward of the turning shafts 99a, 99b, and a driv-ing rod 103 coupled coaxially with a piston rod 102 of the hydraulic cylinder 100 and pinned to noses of the turning arms lOla, 101b.
Owing to such turn driving means 98, an expansive operation of the hydraulic cylinder 100 causes both the support rods 96a, 96b to be driven and turned between an enclosed state parallel with the arms Al to A4 and a projecting state orthogonal to the arms A~ to A4 and projecting to both sides of the arms through the driving rod 103, the turning arms 101a, 101b and the turning shafts 99a, 99b.
Referring next to operation of this embodiment, the transfer bars 10, 11 take standby positions and the arms Al to As are located among the carrying-in stand IS, the working stations Sl to S3 and the discharge shoot ES at the time of press working by the lower dies 3I to 3 3 and the upper dies 4 to 4 3 in the working stations Sl to S 3 . That is, the first arm A~ is positioned in the rear of the carrying-in stand IS in the conveying direction 2, the second to fif.th arms A2 to A4 are positioned be-tween the carrying-in stand IS and the first working station Sl, the first and second working stations Sl, S2, the second and third working stations S2, S3, and the third working station S 3 and the discharge shoot ES, respectively. In such state, the handling mechanisms 95mounted on the first to fourth arms A
to A4 each has the support rods 96a, 96b enclosed in parallel with the arms Al to A4.
When the press working by the lower dies 3~ to
3 3 and the upper dies 4l to 4 3 in the working sta-tions Sl to S 3 ends and thus the upper dies 4~ to 4 3 raise, each handling mechanism 95 keeps the support rods 96a, 9.6b in a state projecting orthogonally to the arms Al to A4. Further, the transfer bars 10, 11 ascend once, as indicated by an arrow 104, move hor-izontally until the arms A~ to A4 are positioned over the carrying-in stand IS and the working sta-tions Sl to S 3, and then descend. Thus, the works W on the carrying-in stand IS and the working sta-tions Sl to S3, are held on the suctlon means 97 of the handling mechanism 95 in the first to fourth arms Al to A4.
Next, the transfer bars 10, 11 ascend once, as indicated by an arrow 105, move horizontally until ~.2~9;~19 the first to fourth arms Al to A4 arrive over the next working stations Sl to S3 and the discharge shoot ES, and then descend, releasing each work W from being he'd bv the suctlon means97, Thus, the works W on the carrying-in stand IS and the working stations Sl to S 3 are conveyed to the next working stations Sl to S 3 and the discharge shoot ES.
The transfer bars 10, 11 then return, as indl-cated by an arrow 106, to a standby position shown in Fig. 12, however, each handling mechanism 95 re-turns the support rods 96a, 96b to the enclosed state in this case.
As press working and conveyance are repeated al-ternate'y, the works W are conveyed to the discharge shoot ES from the carrying-in stand IS through the .
first to third working stations Sl to S 3 in sequence, and thus a series of the press working is completed.
In such conveyor 9', the support rods 96a, 96b of each handling mechanism 95 are kept in an enclosed state parallel with the arms Al to A4 during the pe-riod of the transfer bars 10, 11 being on standby for the press working by the lower dies 31 to 3 3 and the upper dies 41 to 4 3 . Accordingly, the support rods 96a, 96b can be free from touching the lower , . .. .
~ dies 31 to 33 and the upper dies 41 to 4 3, and intervals "~ , .
. .
12;9~1~
among the carrying-in stand IS, the working stations ~ - Sl to S 3 ~and the discharge shoot ES can be shortened ¦ ~ relatively, thus attaining a miniaturization of the .
entire press 1.
- As a further embodiment of this invention, the driving means of the handling mechanism 95 may be designed as of transforming the expansive operation of the hydraulic cylinder 100 into a turning motion of -the turning shaf-ts 99a, 99b through rack and pinion, or the turning shats 99a, 99b can be turned by a pulse motor.
; Fig. 17 to Fig. 21 represent a fifth embodiment , - ~ o~ this invention, wherein parts corresponding to ¦- the fourth embodiment are identified by the same ¦ ~ reference characters. The fifth embodiment is anal-.
ogous to the fourth embodiment, however, what is noticeable above all is that the arm can be partly moved longitudinally in the conveying direction 2.
A conveyed distance of the work W from the carrying-in stand IS to the first working station Sl and a conveyed distance of the work W from the first working station Sl to the second working sta-tion S2 are of a value Q3, however, a conveyed dis-tance Q4 of the work W from the second working sta-tion S 2 to the third working station S 3 is set larger .
, , ., "`', ~'' ' .
~, ~' , -.. , .. .: . ~
12~9;~1~
.
by a distance Q5 than the distance Q3, because a scrap shoot hole 115 is provided ahead of the lower die 32 in the conveying direction 2 in the sccond working station S2. That is, Q4 - Q3 = Q5. Con-sequently, while both ends of the first, second and fourth arms Al, A2, A4 are fixed to both the trans-fer bars 10, 11, both ends of the third arm A3 are borne movably back and forth in the conveying direc-tion 2 on the transfer bars 10, 11.
That is, guide rails 116 extending in the con-veying direction 2 are provided on the transfer bars 10, 11 at a position corresponding to that between the first and second working stations Sl, S2 when the transfer bars 10, 11 are kept at a standby posi-tion, and both ends of the third arm A3 are borne movably back and forth in the conveying direction 2 on the guide rails 116. E'urther, length of the guide rail 116 is set so as to move the third arm A3 by the distance Q5 at least, and a hydraulic cyl-inder 118 as the driving means is supported on a support plate 117 provided orthogonally to the con-veying direction 2 correspondingly to both ends of the guide rail 116. A piston rod 119 of the hydrau-lic cylinder 118 is coupled to the third arm A3 mov-ably through the support plate 117, and hence the .'. ~,, .
', ' ! !
1~9;~19 third arm A3 is movable longit~dinally along the convey-ing direction 2 by an expansive operation of the hy-draulic cylinder 118.
Referring next to operation of the embodiment, when a press working is carried out by the lower dies 3~ to 3 3 and the upper dies 4l to 43 in the working stations Sl to S3, both the transfer bars 10, 11 are on standby positions and the arms Al to A~
are located among the carrying-in stand IS, the working stations Sl to S3 and the discharge shoot ES. That is, the first arm A~ is positioned on the rear of the carrying-in stand IS in the conveying direction 2, the second to fifth arms A2 to As are positioned between the carrying-in stand IS and the first working station Sl, between the first and sec-ond working stations Sl, S2, between the second and third working stations S2, S3, and between the third working station S3 and the discharge shoot ~S, re-spectively. Under such state, the third arm A3 takes a position at the distance Q3 apart from the second arm A2 and at Q~ apart from the fourth arm A4. Further, each handling mechanism 95 has the support rods 96a, 96b enclosed in parallel with the arms Al to A4.
When the press working by the lower dies 3l to -- :. ' .
33 and the upper dies 4I to 43 in the working sta-tions Sl to S3 ends and then the upper dies ~I to 43 ascend, each handling mechanism 95 holds the rods 96a, 96b in a state projecting at right angles to the arms Al to A.,. Further, the transfer bars 10, 11 ascend once as indicated by the arrow 104 of Fig.
17, move until the arms A~ to A4 are positioned over the carrying-in stand IS and the working stations Sl to S3, and then descend. Thus, the works W on the carrying-in stand IS and the working stations S~ to S3 are held by the suction means 97 of the handling mechanism 95 of the first to fourth arms A~ to A4.
Next, the transfer bars 10, 11 once ascend as indicated by the arrow 105, and further move hori-~ontally forward in the conveying direction 2. In this case, the third arm A3 moves relatively forward by the distance Q5 to both the transfer bars 10, 11 accordin~ to an expansive operation of the hydraulic cylinder 118. Thus, when the first and second arms Al, A2 arrive over the lower dies 31, 32 of the first and second working stations Sl, S 2, the third arm A3 arrives over the lower die 33 of the third working station S 3 . That is, while the first, sec-ond and fourth arms Al, A2, Al, move forward by the : .
distance Q3 according to the forward motion of both the transfer bars lO, 11 by the distance ~3, the third arm A3 moves forward by the distance Q4 which is larger than the distance Q3. Both the transfer bars 10, 11 descend after the horizontal move, and each work W is released from holding by the suctlon means 97 in each handling mechanism 95. Thus, the works W on the carrying-in stand IS and the working stations Sl to S3 are completed their conveyance to the next working stations Sl to S3 and the discharge shoot ES.
Both the transfer bars 10, 11 then return to the standby position shown in Fig. 17 as indicated by the arrow 106, however, the third arm A3 further moves rearward in the conveying direction 2 by the dis-tance Q4 accordlng to the contractlng operatlon of the hydraulic cylinder 118, and all the arms A~ to As return to their original positions.Further, the handling mechanism 95 of the arms Al to A4 keeps the support rods 96a, 96b enclosed in parallel with the arms to A4 As press working and conveyance are repeated al-ternately, the works W are conveyed to the discharge shoot ES from the carrying-in stand IS in sequence through the firs-t to third working stations Sl to S 3, . . .
and thus a series of press working comes to comple-tion.
In such conveyor 9', since the third arm A3 is made to move longitudinally in the conveying direc-tion 2 relatively to both the transfer bars 10, 11, the interval between the second and third working stations S 2, S3 can be made larger than that between the first and second working stations Sl, S2. That is, it is not necessary to equalize the interval be-tween the first and second working stations Sl, S2 to that between the second and third working stations S 2, S3, thus shortening the conveyor 9' in length in the conveying direction 2.
In the above embodiment, only the third arm A3 is made movable relatively to the transfer bars 10, 11, however, the other arms can also be made movable relative~y thereto.
. . .
: . .
.
',' _ 36 -
Next, the transfer bars 10, 11 ascend once, as indicated by an arrow 105, move horizontally until ~.2~9;~19 the first to fourth arms Al to A4 arrive over the next working stations Sl to S3 and the discharge shoot ES, and then descend, releasing each work W from being he'd bv the suctlon means97, Thus, the works W on the carrying-in stand IS and the working stations Sl to S 3 are conveyed to the next working stations Sl to S 3 and the discharge shoot ES.
The transfer bars 10, 11 then return, as indl-cated by an arrow 106, to a standby position shown in Fig. 12, however, each handling mechanism 95 re-turns the support rods 96a, 96b to the enclosed state in this case.
As press working and conveyance are repeated al-ternate'y, the works W are conveyed to the discharge shoot ES from the carrying-in stand IS through the .
first to third working stations Sl to S 3 in sequence, and thus a series of the press working is completed.
In such conveyor 9', the support rods 96a, 96b of each handling mechanism 95 are kept in an enclosed state parallel with the arms Al to A4 during the pe-riod of the transfer bars 10, 11 being on standby for the press working by the lower dies 31 to 3 3 and the upper dies 41 to 4 3 . Accordingly, the support rods 96a, 96b can be free from touching the lower , . .. .
~ dies 31 to 33 and the upper dies 41 to 4 3, and intervals "~ , .
. .
12;9~1~
among the carrying-in stand IS, the working stations ~ - Sl to S 3 ~and the discharge shoot ES can be shortened ¦ ~ relatively, thus attaining a miniaturization of the .
entire press 1.
- As a further embodiment of this invention, the driving means of the handling mechanism 95 may be designed as of transforming the expansive operation of the hydraulic cylinder 100 into a turning motion of -the turning shaf-ts 99a, 99b through rack and pinion, or the turning shats 99a, 99b can be turned by a pulse motor.
; Fig. 17 to Fig. 21 represent a fifth embodiment , - ~ o~ this invention, wherein parts corresponding to ¦- the fourth embodiment are identified by the same ¦ ~ reference characters. The fifth embodiment is anal-.
ogous to the fourth embodiment, however, what is noticeable above all is that the arm can be partly moved longitudinally in the conveying direction 2.
A conveyed distance of the work W from the carrying-in stand IS to the first working station Sl and a conveyed distance of the work W from the first working station Sl to the second working sta-tion S2 are of a value Q3, however, a conveyed dis-tance Q4 of the work W from the second working sta-tion S 2 to the third working station S 3 is set larger .
, , ., "`', ~'' ' .
~, ~' , -.. , .. .: . ~
12~9;~1~
.
by a distance Q5 than the distance Q3, because a scrap shoot hole 115 is provided ahead of the lower die 32 in the conveying direction 2 in the sccond working station S2. That is, Q4 - Q3 = Q5. Con-sequently, while both ends of the first, second and fourth arms Al, A2, A4 are fixed to both the trans-fer bars 10, 11, both ends of the third arm A3 are borne movably back and forth in the conveying direc-tion 2 on the transfer bars 10, 11.
That is, guide rails 116 extending in the con-veying direction 2 are provided on the transfer bars 10, 11 at a position corresponding to that between the first and second working stations Sl, S2 when the transfer bars 10, 11 are kept at a standby posi-tion, and both ends of the third arm A3 are borne movably back and forth in the conveying direction 2 on the guide rails 116. E'urther, length of the guide rail 116 is set so as to move the third arm A3 by the distance Q5 at least, and a hydraulic cyl-inder 118 as the driving means is supported on a support plate 117 provided orthogonally to the con-veying direction 2 correspondingly to both ends of the guide rail 116. A piston rod 119 of the hydrau-lic cylinder 118 is coupled to the third arm A3 mov-ably through the support plate 117, and hence the .'. ~,, .
', ' ! !
1~9;~19 third arm A3 is movable longit~dinally along the convey-ing direction 2 by an expansive operation of the hy-draulic cylinder 118.
Referring next to operation of the embodiment, when a press working is carried out by the lower dies 3~ to 3 3 and the upper dies 4l to 43 in the working stations Sl to S3, both the transfer bars 10, 11 are on standby positions and the arms Al to A~
are located among the carrying-in stand IS, the working stations Sl to S3 and the discharge shoot ES. That is, the first arm A~ is positioned on the rear of the carrying-in stand IS in the conveying direction 2, the second to fifth arms A2 to As are positioned between the carrying-in stand IS and the first working station Sl, between the first and sec-ond working stations Sl, S2, between the second and third working stations S2, S3, and between the third working station S3 and the discharge shoot ~S, re-spectively. Under such state, the third arm A3 takes a position at the distance Q3 apart from the second arm A2 and at Q~ apart from the fourth arm A4. Further, each handling mechanism 95 has the support rods 96a, 96b enclosed in parallel with the arms Al to A4.
When the press working by the lower dies 3l to -- :. ' .
33 and the upper dies 4I to 43 in the working sta-tions Sl to S3 ends and then the upper dies ~I to 43 ascend, each handling mechanism 95 holds the rods 96a, 96b in a state projecting at right angles to the arms Al to A.,. Further, the transfer bars 10, 11 ascend once as indicated by the arrow 104 of Fig.
17, move until the arms A~ to A4 are positioned over the carrying-in stand IS and the working stations Sl to S3, and then descend. Thus, the works W on the carrying-in stand IS and the working stations S~ to S3 are held by the suction means 97 of the handling mechanism 95 of the first to fourth arms A~ to A4.
Next, the transfer bars 10, 11 once ascend as indicated by the arrow 105, and further move hori-~ontally forward in the conveying direction 2. In this case, the third arm A3 moves relatively forward by the distance Q5 to both the transfer bars 10, 11 accordin~ to an expansive operation of the hydraulic cylinder 118. Thus, when the first and second arms Al, A2 arrive over the lower dies 31, 32 of the first and second working stations Sl, S 2, the third arm A3 arrives over the lower die 33 of the third working station S 3 . That is, while the first, sec-ond and fourth arms Al, A2, Al, move forward by the : .
distance Q3 according to the forward motion of both the transfer bars lO, 11 by the distance ~3, the third arm A3 moves forward by the distance Q4 which is larger than the distance Q3. Both the transfer bars 10, 11 descend after the horizontal move, and each work W is released from holding by the suctlon means 97 in each handling mechanism 95. Thus, the works W on the carrying-in stand IS and the working stations Sl to S3 are completed their conveyance to the next working stations Sl to S3 and the discharge shoot ES.
Both the transfer bars 10, 11 then return to the standby position shown in Fig. 17 as indicated by the arrow 106, however, the third arm A3 further moves rearward in the conveying direction 2 by the dis-tance Q4 accordlng to the contractlng operatlon of the hydraulic cylinder 118, and all the arms A~ to As return to their original positions.Further, the handling mechanism 95 of the arms Al to A4 keeps the support rods 96a, 96b enclosed in parallel with the arms to A4 As press working and conveyance are repeated al-ternately, the works W are conveyed to the discharge shoot ES from the carrying-in stand IS in sequence through the firs-t to third working stations Sl to S 3, . . .
and thus a series of press working comes to comple-tion.
In such conveyor 9', since the third arm A3 is made to move longitudinally in the conveying direc-tion 2 relatively to both the transfer bars 10, 11, the interval between the second and third working stations S 2, S3 can be made larger than that between the first and second working stations Sl, S2. That is, it is not necessary to equalize the interval be-tween the first and second working stations Sl, S2 to that between the second and third working stations S 2, S3, thus shortening the conveyor 9' in length in the conveying direction 2.
In the above embodiment, only the third arm A3 is made movable relatively to the transfer bars 10, 11, however, the other arms can also be made movable relative~y thereto.
. . .
: . .
.
',' _ 36 -
Claims (5)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a working machine having pairs of lower dies and upper dies disposed on a plurality of working stations, respec-tively, for cooperatively working a workpiece at the respective stations, the stations being set at intervals in a direction of conveyance of the workpiece, a conveyor which comprises: a pair of transfer bars spaced from one another a predetermined distance and disposed on opposite lateral sides of the working stations and extending parallel to each other in the conveying direction, said pair of transfer bars being unitarily movable in a vertical direction and in said conveying direction by respective driving means; a plurality of arms disposed laterally bridging between the transfer bars so that each arm extends the full predetermined distance, said arms, except for at least one arm, being fixed to said transfer bars in a manner non-movable in the conveying direction relative to said transfer bars, said at least one arm being adjustably movable relative to the bars in the conveying direction by a drive mechanism; and a handling mechanism provided for each arm for holding the workpiece.
2. A conveyor as claimed in claim 1, wherein said han-dling mechanism includes suction means carried on a horizontal rod which is rotatable substantially on a horizontal plane between an enclosed state and a projecting state.
3. A conveyor as claimed in claim 1, wherein the interval between two working stations which are associated with said movable arm is set differently from the intervals between two working stations associated with said non-movable arms.
4. A conveyor as claimed in claim 1, wherein said at least one arm moves a distance in the conveying direction differ-ent from a distance that the transfer bars moves during opera-tion.
5. A conveyor as claimed in claim 1, wherein said at least one arm is movable relative to the transfer bars in the conveying direction during the movement of the bars in that direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000566343A CA1269219A (en) | 1984-01-20 | 1988-05-09 | Conveyor in plastic working machine |
Applications Claiming Priority (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59008097A JPS60174297A (en) | 1984-01-20 | 1984-01-20 | Conveyor in plastic working machine |
| JP8097/84 | 1984-01-20 | ||
| JP233968/84 | 1984-11-06 | ||
| JP233969/84 | 1984-11-06 | ||
| JP23396884A JPS61111733A (en) | 1984-11-06 | 1984-11-06 | Carrying device of plastic working machine |
| JP23396984A JPS61111734A (en) | 1984-11-06 | 1984-11-06 | Carrying device of plastic working machine |
| JP23810184A JPS61115632A (en) | 1984-11-12 | 1984-11-12 | Carrying device in plastic working machine |
| JP238102/84 | 1984-11-12 | ||
| JP23810284A JPS61115633A (en) | 1984-11-12 | 1984-11-12 | Carrying device in plastic working machine |
| JP238101/84 | 1984-11-12 | ||
| CA000472214A CA1246313A (en) | 1984-01-20 | 1985-01-16 | Conveyor in plastic working machine |
| CA000566343A CA1269219A (en) | 1984-01-20 | 1988-05-09 | Conveyor in plastic working machine |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000472214A Division CA1246313A (en) | 1984-01-20 | 1985-01-16 | Conveyor in plastic working machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1269219A true CA1269219A (en) | 1990-05-22 |
Family
ID=27543338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000566343A Expired - Fee Related CA1269219A (en) | 1984-01-20 | 1988-05-09 | Conveyor in plastic working machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1269219A (en) |
-
1988
- 1988-05-09 CA CA000566343A patent/CA1269219A/en not_active Expired - Fee Related
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