US1635626A - Sheet-separating device for paper-feeding machines - Google Patents

Description

1927' E. H. LILJEBLADH SHEET SEPARATING DEVICE FOR PAPER FEEDING MACHINES FiledJan. 21 1926 6 Sheets-Sheet 1 $0 QQM QT HT 0" W m H 0T INVENTOR. flaw f 4% A TTORNEYS.

P 1,635,626 July 1927' E. H. LILJEBLADH SHEE.T SEPARATING DEVICE FOR APER FEEDING MACHINES Filed Jan. 21 1926 6 Sheets-Sheet 2 [I "a, a i c) I ll! I lllllll n 4 A TTORNEYS.

July 12, 1927. 1,635,626

E. H. LILJEBLADH SHEET SEPARATING DEVICE FOR PAPER FEEDING MACHINES Filed Jan. 21 1926 s sne is-she'et 3 r/i w INVENTOR. 7

A TTORNEYS.

July 12, 1927.

E. H. LILJEBLADH SHEET SEPARATING DEVICE FOR PAPER FEEDING MACHINE Filed Jan; 21-1926 a Sheets-Sheet IN V EN TOR. BY Mffl A TTORNEYS.

' 1,635,626 Jul 12,1927. BH'ULJEBLADH, 6

SHEET SEPARATING DEVICE FOR PAPER FEEDING MACHINES Filed Jan. 21 1926 6 Sheets-Sheet INVENTOR.

A TTORNEYS.

July 12, 1927. 1,635,626

E. H. LILJEBLADH SHEET SEPARATING DEVICE FOR PAPER FEEDING MACHINES Filed Jan. 21 1926 6 Sheets-Sheet 6 IN VEN TOR. BY i/wmfl A TTORNEYS.

Patented July 12 1927.

UNITED STATES PATENT OFFICE.

ERIC HARRY LILJEBLADH, F GOTTENBORG, SWEDEN.

SHEET-SEPARATING DEVICE FOR PAPER-FEEDING MACHINES.

Application filed January 21, 1926, Serial No. 82,806, and in Sweden December 7, 1925.

Thisinvention relates to sheet separating devices in paper feeding machines for printing presses or similar appliances, by means of which a single sheet from a pile of paper is separated from the pile and fed forwards to the printing press or machine, with which 'the feeding device is combined. More specifically the invention relates to such sheet separating apparatus, which are disposed at the rear edge of thepaper pile with respect to the feeding direction and the prin cipal operating device of which comprises a suction foot. 1

One object of this invention is to provide such means, that when the uppermost sheet .is seized by the suction foot and raised by it, the front edge of said sheet is displaced neither forwards nor backwards by the lifting movement of the suction foot. A further object of the invention is to provide means for. disengaging the sheets from one another, when ready for becoming seized bythe suction foot.

Further objects of the invention are to prevent the raising of more. than one. single sheet at each lifting movement of the suction foot and to properly hold the other sheets in the pile in proper position during the forward feeding of the uppermost sheet.

With these and other objects in view the invention consists in the combination of elements described in the accompanying specification and referred to in the appended claims. 1 V

In the accompanying drawings: Figure 1 is a side elevation View. of the apparatus with the suction foot resting on the paper pile,

Figure 2 1s a similar elevation view. with the suction foot raised having seized the uppermost sheet, whereby some parts are shown in section, V

Figure 3 is a plan view of the apparatus, Figure 4; shows the apparatus from beneath, Figure 5 is an end view looking from behind,

Figure 6 is a side view of a portion of the improved device, 2 Figure 7 is aside elevation view of the as sembled apparatus with driving elements, in a smaller scale, and g V Figure 8 a detail of the suction foot in a side elevation, partially cut.

Similar numerals of reference are em- 200 is secured by a releasable clamping deing press 71 or to the machine, to which the sheets are to be fed, and its rear end vice 4; to a carrier 5. The scew 4 on. the

by means of a link 78 secured to the printframe work 71, to which the apparatus is applied, goes through a vertical slot 6 in the carrier 5, so that the bar end, 200 can if wanted be displaced in vertical direction and secured in position by tightening the clamping screw On the main body 1 and in .one piece therewith two guide bushes 7, 8 are provided for the stearing each of a sliding rod 10, 11 respectively, which sliding rods carry a suction foot holder 9. The bushes 7, 8 are, according for the purpose of this invention, given an inclination forwards against the vertical line as shown in Figs. 1 and 2 and for the purpose, that will be vmore particularly described here below.

, The suction foot holder 9' is formed as a fork, in the two shanks 12,13 of which a suction foot 15.is pivotally mounted ontvvo horizontal journals 14 placed in right angle to the feeding direction. The one shank 13 of the holder 9 isprovided with a slot 16, through which a set, screw 17 passes, that is screwed into an car 18 projecting from the suction foot 15, to makeiit possible to vary the inclination of the suction foot with ref erence to the holder 9.

The intermediate portion 90 of the suction foot holder 9 is formed as a crank, the pin 900 of which is" gripped'by the 'jawlike end 190 of the one arm 19 of a bell crank lever, that is pivotally mounted on the main body 1 by means of a pin 21. The other arm 22of the said bell crank lever by means of a slotted bush 24; and a set screw 23 is clamped to a rocking rod 25, which is given a reciprocatingmovement by a crank 72 on gn oscillatingshaft79in the printing press The upper portion ot' the main body i above the pin 2i, is termed as a low pressure air collectorFlt? the nni n pipe oi whieh is designated by 21' and by n flexible tube 73 connected to 21 surtion pump it. the collector 26 is provided with twopipesockets 28 which by flexible tubes 2!.) oreconnected each to a similar socket Eldon the suction foot 15, so that the cavity 31 of the suction foot 15 communicates through the collector- 26 with the suction pump Til.

The colleetor 52G Lt'urther is in'ovided with on air sluice 32 to .regnihrte the rorunin therein by allowing atmospheric nir to enter the collector 26.

A distributor ki l for compressed air is bolted. to the main body 1 by screws 33 beliindthe collector en. The nminpine 35 ot' the dis ributor Si: is conneeted'to o compressor pinup 7.6 by n flexible tube 'i'o. llhe distributoryi It its lower end is provided with twopipe ()t l\'0i'S nndfzrt its upper [)(JllOll \eithtwo othrsochetsE-ET. In the ilmtor ihhtliere between these two pairs oi sockets provided zrtlirottle 38, the shaft 39 oiwhie h passes through the wall of the distributor Set and is providedlwith a rrn'liolly projecting; urni e110; disposed in tliei'rn r oi :1 finger ell "secured to the sliding rod to on the suction "toot holder 9. A spirnlspring' ill eonneeted to thonn'iin bod 1 tends to hold the throttle nornmllly closed.

According to the liHeSOllil embodiment oi the invention the suction footl i provided with. on zingnl r lHJOhCH suction face. the trout portion fot' which is horizontal, and the lienrportion eli directed upwardly in on acute angle towards the pile. Extending bueltwardly from the suction foot 15 lo ts 43:3 'n'oject :is o. continuation of the in clined portion eli forming supports tor two curred nozzle-s ll; for the .s ironing of coinnre d air from the distributor ill. which nozzles nre'nirotoliy secured to the supports lhso that the eon variably, be inclined with rete ence to the suction :lool; bTiby ineuns oi set screws The nor odes .i-el nrc eonnected to the upper soeliots 3}" ot the distributor Bibby flexible tubes in.

File lower. disqiosed pipe soclieh-rilti of the distrilhitor 3-3; ore eonnected to two other norialbs or. air spraying: bend}:v in by flexible ubes 4-7 which bends l8 are situated so tor :ibnt't the suetii'mrt'oot in, that their poo-L tion bel'iindtho rear edge off the ride lot"), end they. are ntljustiible up and down in rerticnlln disposed holders elf). whiehholders are disnlneenble iillltlfl ll being :ilidnhl -J inoilnted on. n cross bar :10 poeitioued square to the feeding: direction and t-Htlil'lil to the, main body It by means of set s-crr son The heads l8 are provided with bottoms-1, inelijhed torwnrdly :uid downwardly as clearly shown in Fig.1. In thefrout well the heads l8 n-re proi' 'ided each with it verticul slot 5i as o nozzle for the jet o'li' co1npressed air.

The main body 1 also carries :1 roarwordly directed bar 52, below end parallel to the main bnr 2. Along the bar :52 a support 52) is slidnble illllli prorided with on upwardly directed tori-zed uido :rl, which slides along the main bar 2. n urtlier on arm .55 projects downwardly from the support 53 forming :1. bearing piiroi. whereupi'ni 2L tlhp so is hinged in such :1 wow that; it :an swing up and down in a vertical plane uirullel tothe teeding direction, whereby the pin 5'? is positioned substznrli'inlly in the some horizontal plane as the operntite nurince 4-2, when the suction foot 15 is in its lowern'iost posi .ion. The pin 5'? has n erzinh 52%; which. carries a slotted bush lit; with n n ttk screw 59, by which the bush can be (jltllllllttl to a rocking rod (ii. that isigiven n .reoiprocuting movement from zrcrnnlc 71 on the ntoreinentinned oscillating shaft: 79 in the printing. P3141 7'1.

'ih limp 56 near its hub 56? carries on t stondino bow (32' iivotally mounted (trip it} and surroiunliinr the intern1e- )Ultltili ot' the support: 53. The how (32 he front portion tiilo'f the su 'iport- 553, which llll och :1 height and w'dtlh that the how (32 when the lion no is ruieed can be moved upon the wintion (33. To nutonniticnlly reuse this inoreinent a: spiral Spring (it wound about the one pivot ot' the bow (l2 rind secured :it n pin (36, which is fixed, somewhat higher on the bow or so that the tension oi the spr' ti-fl tends to cause the bow 65.5 to swim); lei-words A. stop pin (3'? on the support fiilnrevents the how (352 to swing in too tor above the portion (53. Another pin (35 ieseeured to the nuiinbody 1! in order to nnh down in :2 iertnin moment the bow 2 oil the portion (32-3 For the pur nise mentioned below. (hi the upper side of the thin so there is on :nl iustuible stud (ifhwhich in the raised position oi the thin SGHiilllQGri against the under side (it the support 5?) thereby limiting); the rnise oi. the flop 56. The eup 'nnrt i also is gn'ovided with a spirel spring '70, the one end tiilinillhll is socured to the main body i end which with :1. certain Flexibility couilterzurts the renrwzn'd nn'weinent oi the support 53L The operation of the machine as thus described is as follows: i i i The paper pile MO is placed in position on the table 110. whereupon the main bar 9, carrying: theninin body l, is adjusted ver ticnlly by displacing its T021 endfldti in the rertiezil slot (it of the holder 5 and securing some in the desired position by the set, screw t. This odjnslim: is performed so For, that the suction toot l i presses slightly :igninst the paper pile 100 by; nienno oi. the horizontnl 'l'ece portion The set screws 3, QZ-and 59 are now unscrewed and the whole zippernt-us pushed so for bncluverds, that thereer ill) lit

lid

edge of the suction foot arrives only a little distance in front of the rear, edge of the pile 100 as shown in Fig. 1, in which position the main body 1 is secured by tightening the screws 3, 23 and 59. The set screw 17 is now unscrewed and the suction foot 15 tilted about its, journals let, so that the portion 12 of its suction face is parallel with and gets asli'ght press against the pile 100. The suction foot is secured in this position,where after the air suction and air compressing pumps 74, 76 as well as the rocking rods 25, 61 and the driving mechanism are started.

The uppermost sheet of the pile will then be seized by the suction foot 15 and folded upwards against the rear portion 42 thereof, the rear edge of the sheet falling outside the suction face against the extensions 13. During this suction period the valve 38 is open, the arm 40 pressed downwardly by the finger all. In this position of the suction foot 15 compressed air streams through the both pairs of nozzles a l and 48. The air from the nozzles 18, which is directed against the upper portion of the rear edge of the pile, will thereby loosen the sheets from each other in the said upper portion of the pile. The air from the nozzels 441, which is directed against the upper surface of the .pile somewhat in line with the inclined suction face portion 4-2, tends to blow down such further sheets, which possibly are clinging to the uppermost sheet, when this is seized by the suction foot.

During this period the support 53 has been pushed by the rocking rod 61 into its most backward position, to be seen in Fig. 1, with the flap 56 raised. because the bow 62 in this position of the support 53 has been free to swing up on the portion 63 against the stop pin 67. The crank 58 is thereby inclined rearwardly and the adjustable screw 69 bears against the under side of the support 53. I

The two rocking rods 25 and 61 now take in their most backward positions and in the next moment are given'a forward movement. The rod 25 thereby turns the bell crank lever 22, 19 lifting the holder 9 with the'suction foot 15 upwards, the movement of the latter guided by the sliding rods 10, 11 and bushes 7, 8. On account of the forward inclined position of the bushes 7, 8 mentioned abovethe lifting movement does not occur in a vertical direction but in a somewhat forwardly inclined direction. This inclination of the bushes 7, 8 is chosen so with reference to the inclined portion 42 of the suction face, that the raising and folding motion of the uppermost sheet caused by the suction foot15 does not displace the front edge of said sheet from its initial position. To accomplish his purpose exactly the upward motion ofthe suction foot might occur along a curved line instead ofthe straight line controlled by the sliding rods 10, 11, but owing to the rather short length of the upgoing motion of the suction foot said curvature can be substituted by the said inclination of the rods 10, 11 without destroying the effect in any perceptible degree.

The linger e1. partakes in the upward inoven'icnt of the sliding rod 10, whereby the arm &0 is released, so that the valve 38 is shut by the spring 11. closing the air stream to the nozzles 48. On account hereof the compressed air in an increased quantity and thus with a higher tension will escape through the nozzles H and thus in a higher degree prevent any further sheet to follow the uppermost sheet when seized by the upwardly moving suction foot.

During the last mentioned period the rocking rod 61 moves forwardly the sliding support 53 with the flap 56 resting in the raised position by the bow 62, which still is disposed'upon the portion 63. When the suction-foot 15 is near the upperpoint of its stroke, the support 53 reaches its innermost position, whereby the pin 68 strikes against the bow 62 and pushes it rearwards down from the portion -The support 53 'now will stop immovable yieldingly pressed against the rear end of the main body 1 by the spiral spring 70. The flap 56 however innnediately drops down on the paper pile against the now uppermost sheet, and prevents this sheet from being displaced during the feeding ahead of the sheet, which has been properly seized by the suction foot. Due to the mannerin which the flap 56 is hinged on the pin 57 with reference to the upper surface of'the'pile 100, the front end 'of the same will drop down upon the pile .with a substantial vertical movement, and

hence displacement neither forwardly nor 'backwardly of that-sheet in the pile,'which gets touched by the dropping flap 56, will take place.

During the downward movement of the suction foot now following the rocking rod 61 has reached the forward point of its stroke and is given a backward movement. The arm 58 thereby at first moves backwardly turning the pin 57. in such a way, that the flap 56 1S raised without displacing the support 53 out of its position, because of the action of the spring 70. 'Not earlier than when the screw 69 trikes against the under side of the support 53in which position the flap 56 has totally lost its contact with the pil 100the support'53 will be forced to follow the back ard movement of the rocking rod 61, because then any; further tilting of the flap 61 is impossible. The pin 68, which is stationarily fixed in the main body 1, once again permits the how 62 to swing upon the portion by the action of the spring 6 so that the ila e 56 is prevented from not properly dropping down during all the next forward movement of the support 53.

The suction foot 15 now once again is in ope ative position on the pile 100, the sheet, which now is the uppermost one, is seized thereto, the valve 38 is closed and the open ation will be repeated in the way just described.

I do not limit myself to the constructional embodiment of the invention described above and shown in the accompanying drawing, because slight variations in the parts can be found within the scope or the invention.

Having thus described my invention what I claim is:

1. A sheet sepa *ating apparatus in paper feeding machines for the seizing of: single sheets from a paper pile comprising a main body, an up and down an able suction toot, forwardly inclined guides for said suction foot attached to said main body, said suction foot provided with an angular broken operative face, the front portion of which is substantially parallel to the feeding direction and the rear portion directed upwardly and continued rearwardly project-ing lugs, and means, to move the suction foot straightlined up and down, said main body also provided with a i'listrihutor tor compressed air, connected with an air comprcssor, and with pairs of nozzles. one pair of which is pivotally mounted on the suction toot at the rear side thereol. and the other pair of said nozzles mounted so far abalt said suction foot, that the nozzles are disposed behind the pile of paper under operation.

2. A sheet separating apparatus in paper feeding machines for the seizing of single sheets from a paper pile comprising, a main body, an up and down mov: ble suction toot, forwardly inclined straightlined guides for sari d suction loot attached to said main body, said suction toot provided with an annular broken operative face. the front portion of which is suljistairtially parallel to the feed in; direction and the rear portion directed upwardly and continued by rearwardly projccting lugs, and means to move the suction foot up and down in said guides. said main body also provided with a distributor for compressed air, connected with an air conipressor, and with nozzles, so far ahatt said suction foot, that the nozzles are disposed behind the pile of paper under operation, said. distrilmtor provided with a throttle for the air supply to the nozzles, and means to shut said throttle, when the toot is raised, and to open same, when the suction is descended.

3. A sheet separat ng;- apparatus in paper feeding machines for the seizing of single sheets from apaper pile comprising a main body, an up and down movable suction foot, forwardly inclined guides for said suction toot attached to said main body, a flap hinged on a sliding support behind the suction foot, means to reciprocate said support to and from the suction toot, means to hold said flap raised when said support moves from the suction foot, means to release the flap so as to permit it to fall down upon the pile of paper, when the support has arrived near to its front position and means to hold said support stationary during the raising; and the dropping of said flap and means to adjiuitz bly limit the raisiiur movement of the flap.

4;. A sheet separating apparatus in paper feeding machines for seizing of single sheets from a paper pile conn nxisiugg; a main body positioned near the rear end of the pile, an up and down movable suction foot to or p the uppermost sheet near the rear end of the paper pile, tin'wardly inclined straightlined guides for said suction toot attached to said main body, and means to move the suction foot up and down in a forwardly inclined straightlined direction, whereby the toremost edge of the uppermost sheet rests unmovable during the lilting operation ot the suction foot.

5. A sheet separating apparatus in paper feeding: machines for the seizing; oil. single sheets from a paper pile at the rear edge oi? the some comprising a main body, an up and down movable suction toot, torwardly inclined straight-lined gruides for said suction :loot attached to said main body. said suction toot provided with an angularly brolten operative face, the portions of which coir stitutingr plane surfaces, whereby the front portion is substantially parallel to the teeth ing direction and the rear portion directed upwardly, and. means to move the suction foot up and down in a ili'orwardly inclii'ied straigrlitlined direction.

(3. A sheet separating apparatus in paper feeding machines for the seizing oi? siun'le sheets from a paper pile comprising: a main body, an up and down movable suction "toot, forwardly inclined strai rhtlined n'uidcs tor said suction foot attached to said main body, a flap hinged on a sliding support behind the suction toot, means to reciprocate said support to and from the suction toot, means to hold said flap raised, when said support moves from the suction toot, means to rclease the flap so as to permit it to Fall. down upon the pile of paper, when the suppo t has arrived near to its front position.

A sheet separating apparatus in paper feeding: machines for the seizing of single sheets from a paper p le connn'isinn; a main body, an up and down movable auction toot forwardly inclined straight lined guides for said suction toot attached to said main body, a flap hinged on a sliding support behind the suction foot, means to reoi n'ocate said support to and from the suction foot, means to hold said flap raised, when said support moves from the suction foot and means to hidjustably limit the raising movement of the A sheet separating apparatus in paper feeding machines for the seizingof single sheets from a paper pile comprising a main body an up and down movable suction foot, forwardly inclined straight lined guides for said suction foot attached to said main body, a flap hinged on a sliding support behind the suction foot, means to reciprocate said support to and from the suction foot, means to hold said flap raised, when said support moves from the suction foot, means to release 15 the flap so as to permit it to fall down upon the pile of paper, when the support has arrived near to its front position and means to hold said support stationary duringthe raising and the dropping of said flap.

9. In a sheet separating apparatus an angularly broken suction foot movable straightlined up and down, a hinged flap separated therefrom and pivotable about a centre disposed substantially in level with the horizontal portion of the operative surface of said broken suction foot when in the down position of said suction foot.

In testimony whereof I have afiixed my signature.

ERIC HARRY LILJEBLADH.

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