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1、1Bale twine knotter with adjustable wiperBackground of the inventionThis invention relates to twine knotters for hay or straw baling machines and more particularly to an improved wiper arm for such knotters.In one conventional baler, the twine knotter includes a rotatably mounted billhook for formin
2、g a loop of twine thereabout. On one side of the billhook is a wiper arm which has a pair of finers defining a fork for receiving and guiding twine used to tie a bale. On one side of the billhook is a knife riveted to the fork for cutting the twine after a loop in the twine has been formed around th
3、e billhook. A wiper is formed integrally with the fork of the arm and strips or wipers the loop of twine form around the billhook as the severed end of the twine is held in the billhook jaw. Proper adjustment of the wiper arm relative to the billhook is critical to the operation of the nkotter as th
4、e wiper must strip or wipe the twine loop from the billhook to complete the formation of the knot. Wiper arm adjustment is performed initially at the point of manufacture and periodically thereafter when servicing the baler. It is accomplished by modeling or bending the arm in three areas with a spe
5、cial tool. By modeling, the wiper is centered with respect to the heel of the billhook and adjusted so theat it just clears the billhook jaw. For this reason, it is desirable that the wiper arm be relatively rigid and unyielding so that proper adjustment can be maintained and yet be sufficiently ben
6、dable to permit initial adjustmen. Also, in recent years , stronger twines are being used on such balers to tie bales of higher density. Such changes subject the wiper arm to higher forces during operation thus making it more difficult to maintain the arm in proper adjustmen, while at the same time,
7、 making the arm flexible enough to permit initial adjustment. Accordingly, it is an object of this invention to provide a knotter with an improved wiper arm having a strong and rigid construction to maintain an accurate adjustmen.Another object of this invention is to provide a knotter with a wiper
8、arm which has a wiper which is easily and accurately adjustable with respect to the billhook of the knotter.SUMMARY OF THE INVENTION These and other objects of the invention are accomplished by knotter comprising a rotatably mounted billhook for forming a loop of twine thereabout and a wiper arm wit
9、h an improved adjustably mounted wiper for sliding a twine loop form the billhook while the twine end is retained in a jaw of the billhook to complete the formation of a weine knot. In one embodiment, the wiper has slots formed teerein and is adjustably mounted on the arm and relative to the billhoo
10、k by screws inserted through the slots and thereadably mounted in the arm. In a second embodiment, the wiper has first and second portions joined together at a right angle and is asjustably mounted relative to the arm and to the billhook of the knotter by the insertion and removal of shims between t
11、he second portion of the wiper and the arm.2Brief description of the drawings FIG. 1 is a fragmentary perpective view of a twine knotter in accordance with a preferred embodiment of this invention. FIG. 2 is an esploded view of a wiper arm of the kontter shown in FIG.1FIG. 3 is a view of the knotter
12、 of FIG.1 taken along line 33.FIG. 4 is a fragmentary perspective view of a knotter wiper arm in accordance with a second embodiment of this invention.FIG. 5-9 are fragmentary perspective views pf a knotter of FIG.1 showing progressive stages of knot tying.Description of the preferred embodimentsFIG
13、S.13 show in fragmentary form a knotter 1 in accordance with the preferrde embodiment of this invention. Knotters of this general type are well knowen in the art and are widely used commercially, such as in the John Deere 466 Series balers sole by John Deere Company, a corporation of Delaware. Such
14、balers are used for the baling of hay or straw into a rectangular parallelpiped shaped bale.Knotter 1 comprises a billhook 13 including (1) a center shaft 3on which billhook 13 is rotatably mounted in a knotter frame 5 and (2) a jaw 14 around which a loop of twine is formed as rotated and for retain
15、ing the twine end during knot formation. On one said of billhook 13 a twine disk 15 and a twine holder 16 are provided for holding a segment of twine 19. On the opposite side and below billhook 13, a wiper arm 17 is provided.Wiper arm 17 (FIGS.1,2) includes a twine guiding fork 20 preferably of cast
16、 iron,a knife blade 24 bolted to fork 20 cutting the twine and a wiper 21 for removing a loop of twine 19 from billhook 13.Fork 20 consists of a pair of fingers 22,23 between which twine 19 is received and guided and a vertex 25 at which fingers 22,23 are joined. One side of certex 25 has a boss 25 with a pair of threaded apertures 29,31 and th which wiper 21 is adjustably mounted. Fork 20 may be formed either by casting or forging and therefore
