GB2196572A

GB2196572A - Bale press

Info

Publication number: GB2196572A
Application number: GB08723509A
Authority: GB
Inventors: Hubert Prellwitz; Klaus Oliva; Gottfried Hohlfeld; Michael Hohlfeld
Original assignee: VEB Kombinat Fortschritt Landmaschinen Neustadt (Bestand)
Current assignee: VEB Kombinat Fortschritt Landmaschinen Neustadt (Bestand)
Priority date: 1986-10-29
Filing date: 1987-10-07
Publication date: 1988-05-05
Anticipated expiration: 2007-10-07
Also published as: IT8748486A0; GB2196572B; DE3730732A1; FR2605836A1; DD255464A1; GB8723509D0; IT1211847B

Description

GB2196572A 1 SPECIFICATION a small tolerance, since each refinement is

connected with a higher effort for the adjust Bale press ing equipment.

Consequently, both solutions of the known The present invention relates to a bale press 70 art entail the disadvantage that the work time and has particular reference to a drive for ty- of the machine may be reduced through nee ing means in a bale press for straw, hay and dle damage and increased expenditure may re the like, wherein the tying means is driven by sult due to the greater needle consumption.

a chain. Although the solution with roller chain is rela- A precondition for trouble-free operation of 75 tively cheap, it is, however, limited to rela- a bale press is the exact association of the tively larger tolerances in the setting of the movements of press piston, needles and dimension between needle point and piston feeder. crown. On the other hand, although the solu- In order to reduce the lateral loading of the tion with gears is somewhat more accurate in needles through the pressing stock conveyed 80 respect of the association of the needle point by the feeder, the needles must be withdrawn and the piston crown, this solution is mark as promptly as possible from the press chan- edly more expensive in manufacture.

nel during their return movement. This presup- According to the present invention there is poses that the press piston during its forward provided a bale press provided with settable motion has overlapped the nedle points only 85 tying means, a chain to drive the tying means, slightly on the entry of the needle points into two tensioning rollers each engaging a respec the press channel. This small overlap between tive one of a drive run and a return run of the piston crown and needle points should not chain, and displacing means operable to dis increase substantially, even after longer use, place the rollers in mutually opposite direc due to wear of the drive elements. 90 tions to vary the tension of the drive and In the case of the drive of a tying shaft by return runs for adjustment of play in the tying means of roller chain and chain tensioner in means and further operable to displace the the unloaded run, as known from DE-OS 3 rollers together in a selectable one of the said 172, DE-OS 2 911 906 and DE-OS 1 opposite directions to vary the relative lengths 920 534,there is the disadvantage that the 95 of the drive and return runs for adjustment of chain lengthens with time and a lag in the the setting of the tying means.

rotation of the chain wheel on the tying shaft A bale press embodying the invention may compared with that of the driving chain wheel have the advantage of permitting setting of a comes into being. The consequence is that target value between needle point and piston the extent of overlap of needle point and pis- 100 in very small tolerances during the. first as ton crown is increased, which cannot be cor- sembly and at any time when compensation rected by the chain tensioner. Through the for wear may be necessary.

lagging of the needles, the needles are, in the In a preferred embodiment, two bearing case of large pressing stock feed by the pins, on each of which a respective lever is feeder, highly loaded laterally so that particu- 105 mounted at one lever end thereof, are larly the needle at the feeder side often breaks mounted at a bracket on a carrier of a press off. A substantial lag of the needle in this channel of the press. The other end of each construction of drive can be corrected some- lever carries a respective rotatably mounted what when the roller chain has lengthened to tensioning roller standing in engagement with such an extent that a relaying by one chain 110 a respective one of the loaded and the un pitch is possible. The exact association be- loaded run of the chain. A threaded coupling tween needle and press piston is not always member is rotatably mounted at a bearing lo possible even when a new roller chain is cation, for example approximately in the mid fitted, since the relaying of the drive chain by dle of the levers, wherein one of the threaded one tooth in consequence of tolerance effect 115 members is provided with a lefthand thread through the relatively coarse chain pitch result- and the other threaded member with a righth sin a greater deflection at the needle point and thread. A threaded spindle is screwed than is permissible. For that reason, it is com- into the threaded members and possesses en mon practice to use expensive transmission gagement means, for example a spanner head, elements, such as toothed wheels, gears and 120 at any desired place. A guide ring, which is articulated shafts. fixed positionally at both sides by threaded The described disadvantage of an inexact adjusting members, for example, hexagonal association of needle points and piston front nuts, and carries an encircling groove which in the drive of the tying shaft, however, also receives an aperture rim portion of the bracket occurs with these other transmission elements 125 of the above-mentioned carrier at the press so that additional resetting devices are neces- channel, is disposed on the threaded spindle sary, for example, a hub which is resettable between the threaded adjusting members. A relative to the gear rim of a spur or cone lock nut, which is tightened against one of the wheel by means of a screw connection. How- threaded coupling members, is expediently ever, limits are also set on the maintenance of 130 provided for rotational securing of the spindle.

2 GB2196572A 2 The arrangement of the tension rollers can be the threaded spindle 11. The guide ring 14 such that they tension the chain either out- has an encircling groove 16, in which is re wardly from inside or inwardly from outside. ceived the rim portion of an aperture in the A uniform tension of the chain can be ob- bracket 4. A roller chain 19 leadingfrom a tained through rotation of the spindle at the 70 distributor gear 17 to a driving wheel 18 is spanner head. The exact association of a nee- tensioned by the tensioning rollers 8. The set dle point of the press with a piston of the ting of a target value x between the point of press can be achieved in that the position of the needle 20 and front of the piston 21 is the spindle in the guide ring, which is achieved through displacement of the spindle mounted in the bracket of the carrier, is varied 75 11 in the guide ring 14, by way of positional through resetting of the hexagonal nuts pre- change of both tensioning rollers 8 and rota sent at both sides of the guide ring. In that tion of the driving wheel 18 with entraining case, a drive wheel driven by the chain, to- members 22, by way of entraining rollers 23, gether with an entraining member of the entraining lever 24, cranks 25, coupling 26 wheel, can be turned relative to an entraining 80 and needle rocker 27. The numerals 8', 22', lever with roller fastened at a crank of a nee- 23' and 25' denote the mentioned compo dle drive, whereby the needle point at stand- nents in different settings.

still of the press pistion is moved upwardly or By means of the adjustment arrangement downwardly. During this setting, no rotation of hereinbefore described, the tying apparatus the threaded spindle takes place so that the 85 can be adjusted in respect of play and angular set chain tension is unaltered. setting for maintenance of a desired phase re- Such an arrangement may have the advan- lationship of the reciprocating bale press pis- tage that, due to the exact setting of a target ton and reciprocating tying needle of the value between needle point and piston front press.

that may be possible, needle damage is 90

Claims

avoided and the work time of the press is CLAIMS thereby higher.

Replacement parts for broken 1. A bale press provided with settable tying needles are reduced in number or no longer means, a chain to drive the tying means, two needed and, apart from the slight extra cost tensioning rollers each engaging a respective for the tensioning and resetting equipment, 95 one of a drive run and a return run of the the arrangement is economic to manufacture. chain, and displacing means operable to disAn embodiment of the present invention will place the rollers in mutually opposite direc- now be more particularly described by way of tions to vary the tension of the drive and example with reference to the accompanying return runs for adjustment of play in the tying drawings, in which:

100 means and further operable to displace the Fig. 1 is a schematic side elevation of a rollers together in a selectable one of the said drive for tying apparatus in a bale press em- opposite directions to vary the relative lengths bodying the invention; and of the drive and return runs for adjustment of Fig.
2 is a detail view of tensioning and the setting of the tying means.

resetting equipment in the bale press of Fig. 105 2. A bale press as claimed in claim 1, 1. wherein each of the tensioning rollers is rotaReferring now to the drawings there is tably mounted on a respective pivotable lever shown part of a bale press comprising a and the displacing means is arranged to act press channel 1 containing a press piston 20 on the levers for displacement of the rollers.

and provided with a needle 20. A carrier 2, at 110
3. A bale press as claimed in claim 2, the which two bearing pins 3 and a bracket
4 are displacing means comprising a spindle so disposed, is present on the press channel 1. threadedly coupled to each of the levers that A respective double-arm lever
5 is mounted at rotation of the spindle in one rotational direc one lever arm
6 thereof on each of the two tion pivots the levers to move the rollers bearing pins 3, and a tension roller 8 is dis- 115 away from each other and rotation of the posed at the other lever arm 7. Arranged in spindle in the opposite rotational direction pi the middle of each of the levers 5 is a bearing vots the levers to move the rollers towards point 9 for a threaded member 10, which is each other.

provided with lefthand thread at one of the 4. A bale press as claimed in claim levers 5 and a righthand thread at the other 120 3,wherein the spindle is provided with engage lever. A threaded spindle 11, which at one ment means for a turning tool.

end also has a lefthand thread but has a 5. A bale press as claimed in either claim 3 righthand thread in its remaining region and or claim 4, wherein the the spindle is thread carries a spanner head 12, is screwed into the edly coupled to each of the levers by engage threaded members 10. A lock nut 13 is pre- 125 ment in a threaded bore of a coupling member sent at one of the threaded members 10 to rotatably mounted on that lever.

secure the spindle 11 against independent ro- 6. A bale press as claimed in claim 5, tation. A guide ring 14, whichis held from wherein the bore of the coupling member at both sides by hexagonal nuts 15, is disposed one of the levers has a lefthand thread and between the threaded members 10 and on 130 that of the coupling member at the other one 3 GB2196572A 3 of the levers has a righthand thread.
7. A bale press as claimed in either claim 5 or claim 6, wherein each of the levers carries the roller at one of the lever ends and is pivotably mounted at the other lever end on a mounting member on a press channel of the press, the coupling member being disposed between the lever ends.
8. A bale press as claimed in any one of claims 3 to 7, wherein the spindle is mounted in fixed-position mounting means to be axially displaceable relative thereto for pivoting of the levers in a selectable one of two opposite rotational directions.
9. A bale press as claimed in claim 8, the mounting means comprising a mounting bracket with an aperture receiving the spindle and two threaded adjusting members each threadedly engaged on the spindle and locat ing the spindle relative to a respective side of the bracket, the threaded adjusting members being rotatable to axially displace the spindle relative to the bracket.
10. A bale press as claimed in claim 9, wherein the threaded adjusting members are arranged to act on respective sides of a guide ring rotatably retained in the aperture in the mounting bracket, the spindle extending through the bore in the ring.
11. A bale press as claimed in any one of claims 5 to 7, comprising a lock nut arranged on the spindle and co-operable with one of the coupling members to lock the spindle against rotation relative to the levers.
12. A bale press as claimed in any one of the preceding claims, wherein the tensioning rollers engage the drive and return runs at mutually remote sides thereof.
13. A bale press as claimed in any one of claims 1 to 11, wherein the tensioning rollers engage the dirve and return runs at mutually facing sides thereof.
14. A bale press substantially as hereinbe- fore described with reference to the accom panying drawings.

Published 1988 at The PatentOffice, State House, 66/71 High Holborn, London WC 1 R 4TP ' Further copies may be obtained from The Patent Office, Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD.

Printed by Burgess & Son (Abingdon) Ltd. Con. 1/87,