DE2248590A1 - SLIDE CRANK TRANSMISSION - Google Patents

Description

PATENT LAWYERS

. H. LEINWEBER dipping. H. ZIMMERMANN DIPL.-ING. A. Gf. v. WENGERSKY 2248590

8 Munich % Rosental 7, 2nd exercise.

Part addr. Leinpal Munich phone (0811) 2601999

Postal check account: Munich 22045

October 4, 1972

UnserZelchen FÜ8! Θ. 3969

"Hi / emc / C

Beasley French & Company Limited, Bristol, England

G-Ie crank transmission

The invention relates to a mechanical transmission of motion, namely to a slide crank transmission for transmission a cyclically changing drive between two axes that are offset relative to one another.

For machines in which a continuously moving web is cut at intervals along its length in one direction generally transverse to the feed direction, for example for envelope production machines, it is known that a knife is attached to a machine that extends in the transverse direction during the period of contact between the knife and the web is driven so that these two objects run in the same direction and as precisely as possible at the same speed. Although the Hotationsach.se is generally at right angles to the direction of travel of the web, it is sometimes advantageous to be able to change the axis pitch by a few straight lines in each direction. This should be possible without the entire relative

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■ Change the position of the web feed machinery and the knife drive machinery »According to a recent proposal, The current inventor was involved in the development of this, the drive for the knife contains a cyclical transmission with a slide crank mechanism. For this and for,, others Uses for the invention are intended to be a slide crank release be created, which allows an angular offset between the drive shaft and the output shaft. .

The invention creates a slide crank transmission with two rotatable shafts interconnected by a slide crank mechanism consisting of one of a first of the shaft-supported component with a radially extending slot and a crank part which slides in the slot and rotatably connected to the second shaft about a first axis which is eccentric with respect to the axis of that second shaft and is parallel to it, the crank part being rotatable about a second axis which is essentially radial to the The axis of this second shaft is, and the slot is sufficiently deep to allow angular movement of the crank part in the slot to allow an axis that is at right angles to the. Longitudinal direction of the slot and at right angles to the axis this second wave extends ",

Preferably, one of the two shafts drives a counterweight via a second slide crank mechanism according to FIG its location out of phase with the first slide crank mechanism, runs, that changes in the angular velocity of the second wave go through opposite changes in the Angular speed of the counterweight to be compensated. The second slide crank mechanism may have a second crank portion comprise, which slides in the slot and is rotatably connected to the counterweight about an axis which with respect to the axis of rotation of the counterweight is eccentric and au her

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is parallel. Alternatively, another slotted component can drive the second slide crank mechanism.

Further details, advantages and features of the invention result from the following description, Auf der Zeietl The invention is illustrated by way of example, namely:

Fig. 1 shows a cross section through an inventive Transmission, and

FIG. 2 shows a section in a plane II-II in FIG. 1.

A drive shaft 10 according to the drawing is between; their ends mounted rotatably \ on a support (not shown) and carries at its ends wheels 12 and 14. Each disc j has a diametrically extending slot 16;

the

or 18 in their / drive shaft 10 facing away from the end face. The disk 12 carries an externally toothed toothed ring 20 via which the drive shaft 10 is driven.

In the slot 16 slides a block 22 which has parallel side surfaces and which can be rotated on a pin 24! is mounted, which extends in the longitudinal direction of the slot, The pin 24 is at its ends by the arms of a U-shaped! on bracket 26 held. Runs away from the center of the bracket 26 an axle 28 which is mounted in a crank 30, which at one end of an output shaft 32 is seated.

In the slot 18 a block 34 which is rotatably exzen- [trically connected by means of · a pin 36 having a counterweight sheave 38 to Soheibenachse slides.

_4i 'During operation, the drive shaft 10 is set in rotation by a drive source and in turn drives the output! drive shaft 32 and counterweight disk 38 by means of the slide crank mechanisms. The angular velocity of the down ^;

30981S / 0868 ~ ⁴ ~

BATH ORIGINAL

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Drive shaft 32 and the counterweight disk 38 are given a cyclical change in that the axis of rotation of the drive shaft 10 is offset relative to the axis of rotation of the output shaft 32 and the counterweight disk 38. The crank of the counterweight disk 38 is arranged so that it lies diametrically opposite that of the output shaft 32, and the axis of the counterweight disk 38 is offset in relation to the drive shaft 10 in the same way, so that its angles vary rapidly 180 ° out of phase with those of the output shaft 32. The counterweight disk 38 represents a load approximately equal to that which hangs on the output shaft, bo that the load on the drive shaft 10 is kept constant as well as possible. The counterweight disk 38 can, if necessary, be connected to a further load via a shaft 39 in order to facilitate the balancing.

The axis of rotation of the output shaft 32 can be a few degrees out of parallels to the axis of rotation of the drive shaft 10 can be pivoted. This change in angle can have two components be decomposed, namely firstly a pivoting movement about the axis of the pin 24 and secondly a further pivoting movement about an axis shown in Fig. 2 at 40 »which is at right angles to the axis of the pin 24 and at right angles to the axis of rotation of the output shaft 32. The first-mentioned pivoting movement is due to the rotation of the block about the pin 24 and the latter pivoting movement possible due to the excessive depth of the slot 16. ,

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309815/0868

Claims (4)

Patent claims: Π.) Sliding course transmission with zv / ei reversible Shafts, a part carried by a first of the shafts with a radially extending slot and a crank part, that slides in the slot and with the second of the shafts around a first axis that is eccentric and parallel in relation to the second shaft is rotatably connected, characterized darj the crank part (22) continues around a z './ side .axis (24), which runs essentially radially to the axis of the second shaft (32), is rotatable and that the slot (16) is sufficient is deep to allow an angular movement of the crank part (22) in the Slot to allow an axis (40) that is at right angles to the longitudinal extension of the slot (16) and in the right At an angle to the axis of the second shaft (32). 2. Gleitkurbeitransmission according to claim 1, characterized in that one (10) of the two shafts (10, 52) drives a counterweight (38) via a second slide crank mechanism (34-38) which is used to compensate for changes in the angular velocity of the second shaft '(32) by opposite changes in the angular velocity of the Counterweight (38) according to its arrangement out of phase with the first slide crank mechanism (22 to 30). 3. Gleitkurbeitransmission according to claim 2, characterized in that the second slide crank mechanism a has second crank part that slides in the slot and with dom counterweight about an axis that is eccentric and parallel in sight: is on the rotation axis of the counterweight, rotatably connected ibt. -b- 3 0 9 815 f 4. sliding crank transmission according to claim 2, characterized in that the second sliding crank Irne c ha riiamus (34 to 36) of another provided with a slot (18) ..,., C14),. ,
part / driven ici. ';>. Sliding crank mechanism according to any one of claims 1 Dis 4, f-'ekeLa ^ eic'inet by use in a machine for cutting a constantly new spell of sheet material at intervals along its length using a rotating cutting knife that has a periodic; Performs cutting contact with the web surface and is driven by a cyclic transmission in the form of the GIei tkurbe! Transmission. 309815/0868 BATH ORIGINAL