FR2563200A1 - Waste paper baling press - Google Patents

Abstract

The binding and wire cutting station is intended for a waste paper baling press. It comprises a number of wire cutter pairs on a fixed and a vertically movable carrier on a hinged front wall portion of the press, and an equal number of wire guide needles which are movable through cutouts in the pressure plate when this is in its active position. The carriers are laterally held together via bolts in one engaging vertical slots in the other. Needle guide members arranged to either side of each cutter pair ensure the horizontal position of the needles during their to and fro movement so that they accurately position the wires between the cutters. The needle heads carry discs with U-section annular grooves to engage the wires with min. friction as they draw these off their supply rolls.

Description

 The present invention relates to a binding and slicing station for waste paper packing machines.

 As is known, the old paper compacting machines consist, substantially, of a chamber for pressing the paper to be wrapped, upstream of which are provided a chamber of the piston cylinder pressing unit as well as a loading chamber, between the latter and the pressing chamber being disposed the binding and slicing station.

 The latter comprises, on one side, mounted on two opposite and reciprocally movable vertical slides, a multiplicity of thread guide needles alternately movable through seats in the groove of the paper press, in its retracted end position.

 In known binding and slicing stations, there are various drawbacks and imperfections. The slicing blades are mounted on opposite vertical sliders, of a considerable length, which during the simultaneous slicing of the various binding threads are subjected to a significant force, which causes a distance between said blade-carrying sliders. This can cause incomplete cuts or folds of the wires instead of slicing them, which requires the machine to stop and the operator to intervene.

 The thread guide needles consist of relatively thin rod-shaped bodies and they run fairly large strokes, therefore their end carrying the binding thread is subjected to oscillations in the vertical plane, the amplitude of which frequently exceeds the height. seats of the cutting blades, this is why the wire is not always introduced in a correct manner in said seats. This also requires operator intervention to resume operation.

 In addition, we can observe a significant friction between the heads of the thread guide needles and the peripheral binding threads, which on the one hand produces friction which facilitates the emergence of the oscillations mentioned above and, on the other hand, subjects the binding threads to weakening actions. The latter not only weaken the wire, but they can also damage it and, sometimes, breaks in said wire can occur.

The disadvantages highlighted above are quite significant in practice, in particular if we consider the rough use of these tamping machines and the limitation of the service personnel in the premises in which they are installed, as well as the high speed. working of said tamping machines, in which the pressing unit makes a large number of strokes per minute, for example 5, despite the large quantities of treated paper.

 The basis of the present invention is the task of indicating a binding and slicing station of the type indicated above, which is able to remedy the disadvantages of the stations currently known and to guarantee a binding and slicing process which can be carried out quickly and reliably.

Starting from a binding and slicing station for machines for packing old paper, of the type indicated above, the cited task is solved, according to the invention, by the fact that the proposed binding and slicing station has the following features:
a) the two vertical slides for supporting the slicing blades are associated with each other using positioning means capable of maintaining their correct transverse positioning during the slicing phase,
b) with the pairs of slicing blades, vertical positioning guides of the wire guide needles are associated, which are capable of guaranteeing, in the slicing phase, the correct positioning of the wire guide needles, relative to the slicing blades, or the correct positioning of the binding wires in the associated seats of the cutting blades, and
c) the thread guide needles, provided as pushing needles, have a head with opposite thread receiving jaws, which include thread guiding members, capable of reducing friction with said thread, during the pushing phase, or else extracting said wire from the relative coil.

 With the aid of the binding and slicing station according to the invention, the advantage is obtained of avoiding separation between the cutting blades during the wire cutting operation. Another advantage consists in the safe introduction of the wires to be cut into the seats of the cutting blades. Yet another advantage of the proposed station is represented by the reduction of the friction between the thread and the thread guide needles, which ensures a reliable binding process and which does not compromise the integrity of the binding wire.

 Another advantage is given by the simplicity of construction of the improved members according to the invention, which also bring about a secure automation of the process of tying and slicing of the threads.

 A last advantage of the station according to the invention is to be seen in the fact that said station does not require any modification of the construction of the tamping machine considered and it can certainly also be applied to already existing tamping machines.

The invention will be better understood, and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which will follow made with reference to the accompanying diagrammatic drawings given solely by way of example illustrating a embodiment of the invention, and in which
Figures 1 and 2, respectively, show a side and top elevation view of a waste paper packing machine, as a whole;
- Figure 3 is a partial side view of the binding and slicing station according to the invention, on the binding and cutting side, with the station in the open position;
- Figure 4 is an exploded view of the two sliders for supporting the slicing blades, as well as portions thereof on an enlarged scale;
- Figure 5 is a section through said sliders for supporting the slicing blades, made along a transverse plane passing through a positioning means;
- Figure 6 is a perspective view of an amount of the binding station having positioning guides for the thread guide needles;
- Figure 7 is a perspective view of a thread guide needle; and
FIG. 8 is a vertical section through a head of the thread guide needle along the line VIII-VIII of FIG. 7.

 In all the figures, at various scales, identical parts bear the same reference numbers.

 The binding and slicing station according to the invention is indicated, as a whole, at 1. Said station has a frame 2 articulated at 3 and 4 in an oscillating fashion in flag on a side 5 of the tamping machine 6 executed in a manner known per se. Said matchine has, in fact, a box-shaped configuration and more precisely, at the front, a pressing chamber 7, a loading chamber 8, as well as a chamber 9 for housing the unit 10 with a compacting piston-cylinder. comprising a cylinder 11 and a piston 12 with a press 13. The latter has a multiplicity of guide grooves 14 for a multiplicity of thread guide needles 15 alternately movable by means of a piston cylinder unit 16 and provided on the side 17, or on the side opposite the chassis 2 of the binding and slicing station 1.

 In 16a is indicated a common plate for the needles 15.

 The oscillating frame 2 can be kept in the closed or working position, by means of a bolt stud 18 which can be inserted in the projections 19 and 20, provided first on the frame 2 and the second on the side 5. Said chassis receives two slides 21 and 22 having, individually, a multiplicity of seats 23, 24 for the support, respectively, of a pair of cutting blades 25 and 26. The slide blade 21 is supported fixed, while the slide carrier blades 22 is associated, by means of a system of connecting rods not illustrated in more detail, with an actuating motor 27 and it is therefore alternately movable up and down relative to the fixed slide 21.

For this reason, the slide 22 has end eyelets 28, 29 into which engage, in the upper eyelet 28, a connecting rod stud and, in the lower eyelet 29, a control stud, not illustrated more in detail. According to the invention, between the seats 23 of the blade 22 is provided respectively an eyelet 30 crossed respectively by the rod 31a of a tie rod 31, the latter having, on one side, a control flange 32 and, in the opposite end, a threaded bore 33. In this engages the rod of a fixing screw 34 passing through a corresponding bore 35 provided on the fixed slide 21. The length of the rod 31a corresponds, substantially, to the thickness of the slide 22. In 25a and 26a are indicated, respectively, the seats for receiving the wire of the cutting blades 25 and 26. In 26b is indicated the lower side of the seat 26a, the side which is provided inclines downward and the inside of the blade 26 This guarantees, at the start of the cutting process, that the wire is held on the inside of the seats and that it therefore opposes any sliding movement of said wire towards the outside, like this, otherwise, is often verified.

 In the frame 2 are provided two sides 36, 37 serving to accommodate the shafts 38 supporting the twist hooks 39. According to the invention, said sides are also bent to support the positioning guides 40; for leo rod needles 15. These guides, fixed using screws or the like, have an oblique "conveying" surface 42 and a horizontal positioning surface 43. The position of the guides or support strips 40 and 41 with respect to the cutting blades 25, 26 is such that it determines, for the heads of the needles 15 reaching between the sides 36 and 37, the correct positioning of the wires to be cut in the seats 25a and 26a of the blades 25 and 26.

 The binding needles 15 according to the invention have a rod 44 to which, for example by welding, is fixed a needle head indicated, as a whole, at 45. This comprises two opposite jaws 46, 47 which are mounted, for example using screws, on a shank 48 whose end 48a is fixed, for example by welding, on said rod 44. As can be seen in FIGS. 7 and 8, the jaws 46, 47 have, centrally, a seat 46a, 47a of a width slightly greater than the thickness of the cutting blades 25, 26 side by side, as well as a front side 46b, 47b with double chamfer, the chamfers internal 46c, 47c serving to facilitate the entry of the wire, while the external chamfer 47d of the jaw, respectively lower, 47 serves to obtain a sliding impact on the conveying surface 42 of the guide slides 40, 41. On their sides turned towards each other, the jaws 46, 47 have, in addition, laterally to the seats 4 6a, 47a, two circular seats 49, 50 for housing the cylindrical end portions 51 of a grooved pulley 52, these being fixed using pass-through screws sketched at 53.

 From the foregoing description, it is obvious that with the aid of the binding and slicing station according to the invention it is possible to solve in an efficient manner the task underlying the invention and obtain the advantages mentioned in the introductory part. n in fact, in the proposed station, the vertical slides 21, 22 for supporting the pairs of slicing blades 25, 26 irreproachably maintain their reciprocal sliding position even during the slicing process of the binding threads, because said positioning is ensured in a coercive manner by the small tie rods 31. The flawless action of cutting the cutting blades is guaranteed, in addition, by the correct positioning of the heads 45 of the thread guide needles 15, since said heads, independently of a movement oscillatory in the vertical plane, will arrive with their lower chamfer 7d, before a sliding impact, on the "conveying" surfaces 42 of the sliders 40 and 41 and, then, on the positioning surfaces 43 of said sliders, which by Consequently, the desired reciprocal position between said heads 45 and the associated torques of the cutting blades 25, 26 is guaranteed. The presence of the grooved pulleys 52 as well as their prof it curvilinear continuously, make it possible to reduce to a minimum the engagement of friction between the tying wire which unwinds from its reel and the heads 45 of tying needles 15, which makes it possible to safely avoid any action of weakening or damaging the wire. With the help of the binding and slicing head thus improved, it is possible to obtain impeccable operation, which can be automated with confidence. The oblique execution of the lower side 26b of the seat 26a of the slicing blade 26 also contributes to making the slicing process more reliable, since any slipping of the cutting wire towards the inside of said cutting is surely avoided. seat 26a during the upward movement of the blade 26.

 As can be noted, the execution of the improvements according to the invention can be carried out in a simple manner and without requiring particular components or of difficult execution. These improvements can be made without difficulty even, in particular, on already existing tamping machines.

Claims (7)

 1. Tying and slicing station for old paper compacting machines, of the type comprising, on one side, mounted on opposite vertical and reciprocally movable slides, a multiplicity of pairs of slicing blades, for cutting the tying threads , which are associated with them, as well as, on the other side, a multiplicity of thread guide needles, alternately movable through grooves of the paper press, in its retracted end position, characterized in that  a) the two slides (21,22) for supporting the pairs of slicing blades (25,26) are associated with each other using positioning means (31) capable of maintaining the correct transverse positioning of said slides (21, 22) during the cutting phase of the binding threads.  c) the thread guide needles (15), intended as pushing needles, have a head (45) with jaws (46,47) opposite for housing the binding thread, jaws (46,47) which comprise members ( 52) for guiding the thread, capable of reducing the friction between said heads (45) and said binding threads, during the pushing phase of the thread or else of extraction of the latter from the relative coil.  -b) the pairs of cutting blades (25,26) are associated with slides (40,41) for vertical positioning of the thread guide needles (15), which are able to guarantee, in the cutting phase, the correct positioning thread guide needles (15), or their heads (45) relative to the pairs of cutting blades (25, 26), or else the correct positioning of the binding threads in the associated seats (25a, 26a) of the slicing blades (25,26),  2. Tying and slicing station according to claim 1, characterized in that the positioning means consist of tie rods (31) associated on one side with the fixed slide (21) and having, on the other side, an extension of control and guidance (32) for the alternately movable slide (22).  3. Tying and slicing station according to Reven cation 1, characterized in that the bars (40,41) consist of support strips for the heads (45) of the thread guide needles (15), said strips ( 40,41) having a first routing surface "(42) and a successive guide surface (43), said guides (40,41) being fixed to the sides (36,37) of the station (laterally to the individual pairs of slicing blades (25,26).  4. Tying and slicing station according to claim 1, characterized in that the guide members (52) of the tying wire reducing the friction between said wire and the heads (45) of the needles (15), consist of pulleys (52) articulated (at 53) with orthogonal axis between the jaws (46,47) parallel to the heads (45) of said binding needles (15).  5. Tying and slicing station according to any of claims 1 or 4, characterized in that the pulleys (52) have at their ends cylindrical portions (51) which are housed in seats (49, 50) corresponding, obtained on the faces facing one another of the jaws (46,47) of the heads (45) of the thread guide needles (15).  6. binding and slicing station according to claim 1, characterized in that the seat (26au of the movable slicing blades (26) has a lower side (26b) oblique downwards and inside, so as to facilitate, during the beginning of the slicing phase, the sliding of the wire to be sliced towards the lower part of said seat (26a), or else inside this (26a).  7. Tying and slicing station according to any one of claims 1 or 2, characterized in that in the longitudinal direction of the slide slides (21,22), between the individual pairs of slicing blades (25,26 ) ballast disposed, respectively, a tie rod (31) with control (32), in the movable slide (22) being provided, respectively, an oblong hole 130) for said tie rods (31; and in the solid slide (21), a drilling (35) for a fixing screw (34) being provided.