AXIALLY RECIPROCATABLE CONTROL ROD

Abstract: The invention refers to an axially reciprocatable control rod (4) slidably fitted in a supporting tube (2) protruding into the interior of a box-like structure (1) containing the lubricated mechanical members (6-13) for driving the rod (4). An oil guard sleeve (14) extending toward the supporting tube (2) has one end secured to the inward section of the control rod (4) which protrudes from the supporting tube (2) into the interior of the said box-­ like structure (1), and has its opposite open end fitted over the said supporting tube (2), so as to be longitudinally slidable therealong. The oil guard sleeve (14) keeps always covered and protected against any oil splashes that section of the control rod (4) which protrudes from the supporting tube (2) into the interior of the box-like structure (1).

Description: The invention refers to an axially reciprocatable control rod which is slidably fitted, for example by means of two bushes in a supporting tube protruding into the interior of a box-like structure containing the lubricated mechanical members for driving the rod. A rod of the above stated type is used for controlling certain operating members of any processing machine, particularly for controlling pushing, bending, transferring means, or the like, in a packing machine and expecially in a cigarette-making machine, or the like. With these machines, there is generally the need of avoiding that the articles being processed be soiled by the lubricating oil used for the mechanical members. To this end, as bushes in which a control rod of the above stated type slides, self-­ lubricating bushes are therefore used, whereby a direct lubrication of the rod is avoided. The control rod-driving mechanical members contained in the box-like structure and comprising, for example, cams, rollers, shafts, gearings, levers, crank mechanisms, trunnions, fulcrum pivots, and the like, however require an oil lubrication, for example, a bath lubrication, or a spray lubrication by means of small distributing pipes fed by a suitable circulating pump. It is then inevitable to have the control rod soiled by any oil splashes thrown thereupon by the moving adjacent driving members immersed in the lubricating oil, or sprayed therewith through small distributing pipes at the interior of the box-like structure. Consequently, notwithstanding there is no direct lubrication of the control rod, and in spite of the use of self-lubricating bushes in the supporting tube, any oil which accidentally deposits on the rod at the interior of the box-like structure, each time even in a small quantity, but repeatedly, spreads along the rod owing to its axially reciprocating motion, and unavoidably leaks out of the outward end of the rod-supporting tube, thus causing an undesired soiling of the articles being processed. Such an oil leakage cannot be practically avoided even with the provision of seals and scraper rings. The invention aims to eliminate the above-stated drawback, and to avoid than any lubricating oil having leaked out of the control rod-supporting tube, may soil the articles being processed in a processing machine, of which the said control rod forms part. To this end, according to the invention, an oil guard sleeve extending toward the supporting tube, has one end secured to the inward section of the control rod which protrudes from the supporting tube into the interior of the box-like structure, and has its opposite open end fitted over the said supporting tube, so as to be longitudinally slidable therealong, the whole in such a manner that the oil guard sleeve keeps always covered and protected against any oil splashes that section of the control rod which protrudes from the supporting tube into the interior of the box-like structure. Thus, the oil guard sleeve according to the invention protects the rod against any oil splashes at the interior of the box-like structure, that is to say, it avoids that on this rod there may accidentally deposit the oil used for lubricating the driving members contained in the said box-like structure, and so the oil is prevented from leaking thereout along the rod through the bushes in which the rod slides, and through any possible barriers (such as scraper rings, seals, and the like). These and other features of the control rod according to the invention, and the advantages arising therefrom, will appear in the following specification made by referring to the annexed drawings, in which: Figure 1 is a longitudinal sectional view showing a control rod according to the invention, in the position in which it is retracted into the associated box. Figure 2 is a longitudinal sectional view showing the same control rod, in the position in which it is extended out of the box. Figure 3 is a longitudinal sectional view taken on line III-III in figure 2. Figure 4 is a cross-sectional view taken on line IV-IV in figure 3. In the figures, numeral 1 denotes the wall of a box into the interior of which there protrudes a supporting tube 2 passed through the wall 1 and secured thereto ny means of a flange 102. Fitted in tube 2 are the self-lubricating bushes 3 in which the control rod 4 is axially slidably mounted. The outward end of the control rod 4, which is out of the box, carries an operating member of any processing machine, for example, a pusher 5 of a cigarette-­ packing machine. The inward end 104 of rod 4, which protrudes into the interior of the box, is fork-shaped, and by means of an intermediate link 6 and of pivots 7,8, it is pivotally connected to a driving lever 9 which is fulcrumed about 109 on a suitable support (not shown) at the interior of the box. The driving lever 9 is caused to swing about its fulcrum 109 in the direction of the double arrow F1, by means of a pair of cams 10,11 with which there cooperate the rollers 12,13 mounted onto the said driving lever 9. Thus, the control rod 4 is imparted an axially reciprocating motion in the direction of the double arrow F2. The cams 10,11, the rollers 12,13, and the articulations 7,8 are sprayed in known manner with lubricating oil by means of small distributing pipes (not shown). In order to prevent the control rod 4 from being soiled by any splashes of lubricating oil, a cylindrical oil guard sleeve 14 extending toward the wall 1 over the supporting tube 2, is secured to the inward end 104 of rod 4, and is freely slidable in the longitudinal direction relatively to the supporting tube 2, since its inside diameter is greater than the outside diameter of said tube 2. The oil guard sleeve 14 is of a rigid construction and is so long that it always covers that section of rod 4 which protrudes from the supporting sleeve 2 into the interior of the box, that is to say that when the rod 4 is in its fully retracted position inside the box, the oil guard sleeve 14 still has a certain section threaded over the supporting tube 2, as shown in Figure 1, while it does not abut against the wall 1 when the rod 4 is in its fully extended position outside of the box, as shown in figure 2. The oil guard sleeve 14 is secured to the fork-shaped end 104 of rod 4 by means of the end plate 114 of this sleeve 14, and by means of screws 15. This end plate 114 of the oil guard sleeve 14 is shaped like a circle segment, so that it has an aperture 214 preferably in correspondence of its downwardly turned portion. This aperture 214 is for avoiding any air pumping phenomenon due to the quick axially reciprocating motion of the oil guard sleeve 14 simultaneously with the control rod 4, relatively to the stationary tube 2. Moreover, any oil which may drip down from the supporting tube 2 into the oil guard sleeve 14, can be drained through the aperture 114. For the same purposes (free circulation of air and oil drainage), the oil guard sleeve 14 has in its lower portion a longitudinal slot 314. In correspondence of its inward free end, the supporting tube 2 has an external wide collar 202 that forms a sort of barrier preventing the oil from dripping down from tube 2 onto the control rod 4. In its lower portion, preferably in correspondence of the longitudinal slot 314 in the oil guard sleeve 14, the supporting tube 2 is provided with one or more holes 302 for letting out any oil which may seep into the said tube 2. Of course, the present invention comprises also those models attaining a same utility by using the same innovative conception. More particularly, the control rod 4 may be driven by any other means different from the swinging lever 9 and the pair of cams 10,11.

Claims: 1. An axially reciprocatable control rod (4) slidably fitted in a supporting tube (2) protruding into the interior of a box-like structure (1) containing the lubricated mechanical members (6-13) for driving the rod (4), characterized in that an oil guard sleeve (14) extending toward the supporting tube (2) has one end secured to the inward section of the control rod (4) which protrudes from the supporting tube (2) into the interior of the said box-like structure (1), and has its opposite open end fitted over the said supporting tube (2), so as to be longitudinally slidable therealong, the whole in such a manner that the oil guard sleeve (14) keeps always covered and protected against any oil splashes that section of the control rod (4) which protrudes from the supporting tube (2) into the interior of the box-like structure (1). 2. The control rod according to claim 1, characterized in that the oil guard sleeve (14) has in its lower portion one or more holes or a longitudinal slot (314). 3. The control rod according to claim 1, characterized in that the oil guard sleeve (14) is secured to the rod (4) by means of an end plate (114) which is provided, preferably in its lower portion, with at least one aperture (214). 4. The control rod according to claim 1, characterized in that the supporting tube (2) has its free end provided with an external collar (202). 5. The control rod according to claim 1, characterized in that the supporting sleeve has its lower portion provided with one or more holes. 6. The control rod according to claim 1, characterized in that this rod is fitted by means of one or more self-­ lubricating bushes (3) in the supporting tube (2), so as to be axially slidable therein.

Inventors: FANTELLI, DANIELE, VIGNOLI, TERENZIO
Applicants: SASIB S.P.A.
Application year: 1987
Main classification: F16N31
IPC codes: F16N31, F16J15