DE2049982A1 - Drive to control the movement of a knife - Google Patents

Description

Dipl. »Ng. R. Mertens
Patent attorney

Frankfurt / Main, October 9, 1970 - F 83 P 18 -

GRAPHA Maschinenfabrik Hans! SUller AG, Zofingen / Switzerland

"Drive for controlling the movement of a knife

The present invention is a drive acidic Control of the movement of Hessers, especially for book block cutting machines, wherein the knife cooperating with a counter knife is essentially in the cutting plane is moved vertically towards and away from that and for this purpose at two approximately parallel and equal lengths Swivel levers is articulated, their swivel and joint aohsen lie perpendicular to the cutting plane.

749-751 V / k Jail 23

1 09827/0032

In such devices, the speed has dee The knife has a sinusoidal characteristic between two end positions. With high-speed cutting machines performs this speed characteristic of the cutter to the difficulty that above a certain cutting frequency the time span for the supply of the Book blocks to the trimming stations is too small.

The purpose of the present invention was to create a drive for controlling the movement of a knife, such that that this is decelerated or accelerated in certain phases of movement, in particular that it is in its upper end position stays for a relatively long time and quickly moves to its lower end position and even faster during the cutting cycle moved back from this; so that a sufficient period of time remains for the supply of the following book block.

According to the invention, this purpose is achieved in that a cam groove is connected to one of the pivot levers, in which an eccentric cam engages, which around a to the cutting plane vertical shaft is rotatable and its symmetry axis describes a cylindrical surface concentric to the shaft, that the cam groove can be swiveled around an axis perpendicular to the cutting plane between two end positions is, which is arranged at a distance from the drive shaft that the Nockeniiutlängbraittellinie in the one end position Concave to the axis of rotation of the cylinder jacket surface and in the andoren end position forms a convex curve piece whose

109827/0032

Ends in any Verachwenklage intersect the cylinder jacket surface, that the cam groove longitudinal center line in no position intersects the plane formed by the symmetry axis of the cam and the pivot axis of the crouch groove at a right angle and that in order to delay the pivoting movement in a certain pivot position the curvature of the cam center groove longitudinally the corresponding Preh path of the cam of the curvature of the cylinder |

mani; eleven puddles is approximated.

Based on the accompanying schematic drawing, the Invention heispi ^ ltweifse arläutorv. iila tend;

JrIg. 1 ei.iiö iPr-inzipakisse sur Ei-läu ^ orun ·], des Erfi

gficlar? · f-iifi and
Fiasst S a ^ vriiJlum ^ ß'boi

Tn o-5r J5er ^ fftmiscig lies the cutting plane of a knife 1 parallel to the point: The lä? Ser 1 has swei G lenkaol ^ acn 2. uni 2 ^G ai? F, an denon sv.si Rchwenkhebel 3 and 3 ^if au'srlt: nkt ο: '. · Ϊ́ (1, Die Scbwenlche ^ ol 3 w ^ d 3 ¹³ are v the Schv / enlrachariii 4 and 4 "verscihvvftn""bf? r ßcletzt« The G lonk- ur-d is ^ iworilcac'isen 2,? J bav;. 4 _r ^ 'p.ind to the plane Λοπ Mocsers 1 vertically oriented: '. E? .- t. As the i.'ig. Λ j? .Ei {5t _t iot' ii »f5 sacristan 1 between a harvest, with aui = £; c: pulled i; t: v. ^ Uiii cßKeioImrit ^ n v.il <ine: 'r .-' C-: · ton, gCMJi-ra ß '.' zoi.cla <* ■■. ■ η Undluije Vi-.r.nc

BATH ORIGINAL.

10 9 8 2 7/0032

A cam groove 5 is connected to the pivot lever 3. The cam groove 5 is on a lever pivotable about an axis 6 7 attached. The axis 6 is arranged perpendicular to the cutting plane of the knife 1. The lever 7 is between two in Fig. 1 pivotable end positions. The lever 7 is connected to the pivot lever 3 by a push rod 8, which is pivoted with its ends on the lever 7 or on the pivot arm 3 is. Every pivoting movement of the lever 7 is thus transmitted to the knife 1. The cam groove 5 engages an eccentric cam 9? which is arranged on a disk Io. The disk Io is rotatably mounted on a shaft 11, which is also arranged perpendicular to the cutting plane of the Iflessors 1. The axis of symmetry of the eccentric cam 9 describes a rotation of the shaft 11 Cylinder jacket surface 12. The length of the cam groove 5 is chosen so that their ends during a pivot = - Movement of the lever 7 between its end positions does not cut the cylinder jacket surface 12. In the with undressed The end position shown in dashes, which corresponds to the lowest position of the knife 1, has the cam groove 5 a Drive shaft convex shape. In the other end position shown in dashed lines, which is the upper end position of the knife

I corresponds, the cam groove 5 has a to the drive shaft

II concave shape. In this end position the cam groove falls lüngrimittcllinie over a curved path of the eccentric cam 9 of approximately 90 ° together with the cylinder jacket surface 12. In the other end position, the longitudinal center line of the cam is tangent only the cylinder jacket surface 12.

109827/0032 ^{8AD oriö |} nal

If the disk Io rotates starting from the end position shown in solid lines in FIG. 1 in the direction of the arrow drawn in, the eccentric cam 9 pivots the lever 7 relatively quickly towards its other end position. As soon as the eccentric cam 9 reaches the stretch of its rotary path in which the longitudinal center line of the Noekennutlängsmittellinie with the cylinder surface eleven.lache 12 falls to Gainaien, the lever 7 remains in this end position until the Exaenternock 9 erroicivb that point / on clem away the radial distance between the cam groove and the drive shaft 11 is larger than the radial distance between the cylinder man *; eleven laugh 12 and the drive shaft 11. From this point off the Exsenternocke 9 ^ gsably \ x u hesclLlemiigt increasingly the lever 7 in aüine other end position, whereupon the Be-off described) '. dreary outdated.

Im L ^ .iifVüiTU'ißuheiiipJjil nsich Pig. 2 are the same or J

aequivalon ?; »; O'oiie ω provided with the same reference number win in the above-described principle symbol. In diuseiu Aun / ünrung ibnifjfti ^ l the axes 4 and 6 fall out of the mon, where 'lic; UoekfiiüAut 5 feat connected to the pivot lever 3 itit. Hit ei. ^ Or ιΛατν & η plate 13 firmly eats a Gegenennieuoer 14 verbund «ru On the plate 13 are the S ^ hv / onkacheen 4" and 46 fael'enfcig ';, vm which the pivoting levers 3 and 3 "fjchwcinkbar ßol & f / erfc wind . Bas MesetiT. ¹ 1 Ia-; hinged vm Gelenlcachsen the 2 and 2 'to the pivoting levers 3 and J "

BATH ORIGINAL Ί09827 / 0032

The pivot lever 3 is angular, the cam groove 5 being arranged in its lateral extension. _{An eccentric cam 9 t} engages in the cam groove 5 and is arranged on a gear wheel Io which is rotatably mounted on the shaft 11. The gear Io is geared to a driven rack 16 via intermediate gears 15. The eccentric cam 9 is continuously rotated on a circular path by the rack 16, so that its axis of symmetry describes a cylinder jacket surface 12. In the in Pig «. 2, the lower end position of the knife 1, the cam groove center line forms a curved piece that is convex to the shaft 11, while in the upper end position of the knife 1 it forms a curved piece that is concave to this. The length of the cam groove 5 must in any case be chosen so that the ends do not intersect the cylinder surface 12 in any contractions.

The device works as follows. The toothed wheel Io is driven by the motor-driven rack 16 via the intermediate wheels 15 and the eccentric cam 9 rotates continuously on a circular path. Its axis of symmetry describes the cylinder jacket surface 12 and moves the pivot lever 3 relatively quickly to the other end position, in which the knife 1 axially extends the approximate distance from the geometry meter 14. In this end position , the cam groove center line overlaps along an arcuate path of the eccentric cam 9

^! ■■■■■ · - ·> - 8AD ORIGINAL

109827/0032

approximately 90 ° with the cylinder jacket surface 12ι so that the knife 1 remains in its upper end position during approximately a fourth? -umdr * shung äer exsenter cam 9. Near the Exssnternocke 9 the mentioned arched path of

SO ^{0 has} passed, the planer 3 moves relatively ζ-ζηοΐ in i3oiiie other end position, whereupon aiob. dex * bo3ohrici3ene ν; -W3gu'figsvorgang vvi.ederholt. The curvature of the iit ^ okennut S: '.; 3 · in -joööm Pail so su choose that their Tiänfjsüvltt-eillinio:' j?

he wasted the plane which dum dio A ^ hsc CY. 46 and the syrnaotri axis of the-}?: I: ^ «vy '; orn /! T;] c-3 9 i? OV:"' ■ ".-.- det rrivil under einoin right Winlio'i. son ο: l del ;.

Es: Ibu dein '1? Aohmann obvious, the KrUrannmg de ?? 5 if from Bowugungflcharalcteristiken according to r.-u YJähllsri,

'· ■■ "' *> ■■ '' _λλ BADDWOtNAL

109827/0032

Claims (4)

- 8 Fat Entane Claims Drive for controlling the movement of a knife, especially for book block cutting machines, the knife interacting with a counter knife being moved in the cutting plane essentially vertically towards and away from it and for this purpose on two approximately parallel and equally long pivot levers is articulated whose pivot and hinge axes are perpendicular to the cutting plane _t characterized in that a cam groove is connected to one of the pivot levers, in which an eccentric cam engages, which describes a cylindrical surface concentric around a shaft perpendicular to the cutting plane, that the cam groove around a to the cutting plane vertical axis is pivotably mounted between two end positions, which is arranged at a distance from the drive shaft that the cam groove along the center line in one end position forms a curve piece that is concave to the axis of rotation of the cylinder jacket surface and convex in the other end position, the ends of which do not pivot ge cut the cylinder jacket surface so that the longitudinal center line of the cam groove does not in any position intersect the plane formed by the axis of symmetry of the cam groove and the pivot axis of the cam groove at a right angle, and that in order to delay the pivoting movement in a certain pivot position, the curvature of the longitudinal center line of the cam groove along the corresponding axis of rotation Nooke approximates the curvature of the cylinder jacket surface "
, .. ,,: wc; «.:. ·, * 109827/0032 2) Drive according to claim 1, characterized in that the cam groove is firmly connected to one of the pivot levers and that the mentioned axis with the pivot axis of this a Lever is identical. 3) drive according to claim 2, characterized in that to retard the motion of the knife in its upper end position dia Hockennutlängemittöllinie in its corresponding end position like the one sheet path length of the squat of approximately 90 ° with the Zylindenaant eleven laugh coincident. 4) drive according to claim 3? characterized in that the swivel axis and the V / eile are arranged on a plate parallel to the cutting plane, that the cam is arranged eccentrically on the gearwheel, which is rotatably mounted on the shaft, and that the gearwheel ütoor Zwischen.ar> 2 \ ^! ider gear can be connected to a splined shaft. 10982770032 BAD QSKSIMAL Blank page