DE7131281U - Pre-gripper drive - Google Patents

Description

YBB Polygraph Leipzig "·· ^{': ·} Γ" Combine for printing machines

and equipment ',
Leipzig

Leipzig, August 3rd, 1971 Pre-gripper drive

The invention relates to a curve-free drive Pre-gripper for arch printing machines

With sheet-fed printing machines, the sheet to be printed is transported from its saw position on the feed table of the machine the cylinder pressure cylinder rotating at a constant speed or feed drum - usually by moving forward and backwards The arches located in the shortest possible time to cylinder circumferential speed accelerated and in cinsr sus cylinder always constant position to be transferred to its gripper.

Due to the high printing speeds customary in modern sheet-fed printing machines and because of the use of the smallest possible cylinder diameter, which requires little effort only a small fraction of that required for one cylinder revolution Time available to carry out the pre-grabbing movement; the occurring large accelerations and high delays are precisely controlled

Since the pre-gripper drives generally affect the machine performance Limit sheetfed printing machines, the design of these drives must be given the greatest possible attention

Four-link coupling gears are known for the pre-gripping drive ", in which the pre-gripper directs the output link

= 2-

represents or where to increase the oscillation angle a the output member carries a toothed segment which meshes with a gear arranged on the pregripper The disadvantage of these drives is that at maximum speeds high accelerations occur ^ only a limited one Gttfl ic hljauf area in the handover time ", not sufficient Momentary stop at the feed table and no harmonious sequence of movements can be realized *

The purpose of the invention is to provide a pre-gripper drive on the To develop the basis of a four-link chain for extremely high speeds *

The object of the invention is to create a pregripper drive on the basis of a four-link chain, with which one is the lowest Acceleration values, a good momentary stop at the AnlegerisohV maximum synchronization area during sheet transfer and thus a harmonious sequence of movements is feasible

According to the invention, the object is achieved in that the Conditions

Length of the drive crank ^ _{6 Oj3 bia 0} , 6 vorzugswf 0.5 distance between the frame points

Length of coupling _{0> 6 bia lf0} preferred * 0.8 Distance between the gestures Length of the output rocker

behavior*

In the position of the pre-gripper on the feed table there are paddocks and drive crank in top position · The frame point of the drive crank coincides with the axis of the feed drum or the pressure cylinder together. The drive crank is d & uei with the drive gear the feed drum or the printing cylinder are identical

The length of the vor gripper is preferably equal to the radius the feed drum or the pressure cylinder «Between the drive crank and the output rocker is a spring learning nt arranged

The invention is based on an exemplary embodiment further explanation iferden *

You lousy sicimung ssig ⁴ ; sine schssats dar-

a te ling of the pre-gripper drive o ·

The lying on the table 1, aligned and controlled Arch is taken over by pregripper 2 in a generally known manner, at the cylinder circumference speed accelerated and to the printing cylinder 3 or «, a feed drum 3 handed over «The drive of the Vor gripping era 2 takes place shower a gas a crank 4 $ a paddock 5 and one as a double hoist, the 1st lever arm of which the pregripper 2 and its 2 "lever arm is connected to the coupling 5 ia1rjB.uagebuild output loop 6 existing crank arm · The basic parameters of the crank arm are as follows

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Length of the drive crank _o ",, .. _{o ß} Spacing of the pitch points ■ »■ * ^xe *

bla 1.0 pre-weighted 0.75

I The crank wage length is also designed so that in the position

j <He anticipates the belt 5 with the

f Drive crank 4 is in deodorant

I drive position) Dqz frame point 8 of the drive arm 4

'{ coincides with the Aohae of the printing cylinder 3 or the feed drum

ι 3 together ¹ , it represents the drives gear of the printing cylinder

I or the feed drum or the pressure cylinder or the feed I drum itself the drive crank 4 «The length of the I gripper 2 is preferably the same as the Badius of the

\ drum or pressure cylinder 3 #

^: D ¹ OiCh the inventive training of the anticipatory erantr ie bee

\ wildly achieved ^ that even at maximum speeds a? low

I acceleration fine momentary stop at the dock ischjf maximum synchronization range during sheet transfer and a harmonious sequence of movements can be realized

Claims (1)

ns pr (ic he ι I * Curve drive trumpet "Pre-gripper drive for sheet-fed printing machines by means of a four-link chain"! in particular a crank arm, characterized in that the ratios Length of drive crank O; . _n . . Distance between Gestelipuxacte (TfSJ ^{>> 3} » ⁶ preferably 0.5 length of the belt (5) _ ,. _n 7 _c .. ... ^ Distance of the Sesiellpunkrba (7 _S S) * ^1θ ° » ^{6 bls 1} I ⁰ preferably Length of the output «a? Inge € C coupling point ^ frame point) _... _{Λι (} - ..,. _ Ibsland of the rack point fairy 17 | S> ^mle ° » ^{5 to 1} ^ ^0, preferably 0.75 behavior" 2, cam drive-free pre-gripper drive according to Claim I _9, characterized in that when the pre-gripper is in position on the plant surface C1) the coupling (5) and the drive crank (4) are in the cover layer 3 «Kurventrlebfzeiez Before attacking drive according to claim 1 and 2, characterized ^ that the frame point (7) the drive crank (4) is the same as the axis of the feed drum bzn. of the printing cylinder (3); 4 »Pre-gripper drive without cam drive according to claim 1 to 3, characterized in that the drive crank (4) nit the drive gear of the feed drum or the printing cylinder (3) is identical « 5 Pre-gripper drive without cam drive according to claim 1 to 4, characterized in that the length of the before gripper ers (3) preferably equal to the radius of the all-laying drum or of the pressure cylinder (3). -2- 7131211-4.11.71 6% cam drive-free x pre-gripping drive according to claim 1 to 3j daduroh characterized in that a peder element is arranged between the drive crank (4) and the drive crank (6) 71312J1-4.11.71