DEVICE TO MAKE LATERAL GUSSETS ON A TUBULAR SLEEVE OF CONTINUOUS FLEXIBLE MATERIAL

Abstract: Device to realise lateral gussets on a tubular continuous sleeve of flexible material, during the unrolling, including a shaping equipment (3) inserted on the inside of the tubular continuous sleeve (1), supported from the outside of said sleeve by means of sustaining rollers (2) and kept in the right position by the upper opposed external rollers (4).

Description: DEVICE TO MAKE LATERAL GUSSETS ON A TUBULAR SLEEVE OF CONTINUOUS FLEXIBLE MATERIAL TECHNICAL FIELD The present invention pertains to the technical field of packing machines, specifically to the filling machines of flexible material bags realized starting from rolls of continuous tubular sleeves. The invention is included in the International Classification B65 b. STATE OF THE ART Filling machines for bags made out of continuous tubular sleeve already provided with lateral gussets are already well known. However, the rolls of the tubular sleeves with side gussets are also known to have this common flaw: the gusseted edges make the rolls' diameter greater at its sides. This problem causes the time for the rolls' unrolling to be shorter, therefore several more interventions for the rolls change are needed. To solve the indicated problem, the present invention suggests the employment of a device installed in between the filling machines and their feeding rolls: the rolls without gussets can be bundled over a considerably greater diameter in order to optimize the technological process. DESCRIPTION The invention is now disclosed in details, with reference to the figures of the drawings attached as a not limiting example. Figure 1 illustrates schematically the set-up of a gusseting device in between the feeding roll and the bags' filling machines. It should be pointed out that the roll has a very wide diameter because the continuous tubular sleeve is not provided yet with side gussets. Figure 2 is a vertical section of the gusseting device that is inserted in the sleeve. Obviously said insert can occur only by performing a special slit on the tubular sleeve. Figure 3 is a front view of the gusseting device inserted in the tubular sleeve. One could observe that the sleeve before the gusseting operation is larger, while it features side narrowing after the passing through the gusseting. Figure 4 is an horizontal cross section of the sleeve, still without gussets, over the lower zone of the gusseting device. It can be noticed that the sleeve is displayed in full width since it still lacks side gussets. Figure 5 is an horizontal section of the central zone of the gusseting device. One could notice two lateral shrinkings shaped as triangles along which the tubular sleeve begins the shrinking of the side edges Figure 6 is a cross horizontal section of the internal gusseting device by the upper end zone. One could observe that the tubular sleeve has both the side edges already gusseted, because of the intervention of the shaping devices, set up by the two lateral edges. Figure 7 is a perspective view of the gusseting device that has to be inserted initially in the tubular continuous sleeve. In the figures of the attached drawings each single detail is marked as follows: 1 is the continuous tubular sleeve, without side gussets, fed by a large diameter roll. 2 indicates the lower rollers that sustain from the outside the shaping equipment inserted on the inside of the tubular sleeve. 3 is the shaping equipment that has to be inserted on the inside of the tubular sleeve and laid over the two external sustaining rollers. 4 indicates two upper external rollers that keep in the right position the shaping equipment on the inside of the tubular continuous sleeve. 5 indicates two shaping elements that, operating from the outside by contrast and by co¬ operation with the internal shaper (3), fold the side edges of the tubular continuous sleeves, this way creating the side gussets. 6 indicates side narro wings on the shaper (3). 7 indicates two parallel surfaces on the upper part of the shaper. 8 indicates the width of the shaper body (3) that is dimensioned on the lower part according to the width of the tubular sleeve still without side gussets. 9 indicates the side gussets made out of the edges of the continuous tubular sleeve. 10 indicates a large diameter roll around which a considerable amount of continuos tubular sleeve, still without side gussets, is bundled. 12 indicates the gusseted sleeve. The simplicity of the operation is clearly illustrated by the figures of the drawings, attached as a not limiting example. It is understood that the shaping device must be inserted in the continuous tubular sleeve through a special slot that is initially cut onto the sleeve in order to allow the introduction and the placement of the gusseting device on the inside. The latter is supported by the lower sustaining rollers and kept in position by the upper external rollers. It is also evident that the dimensions of the shaping device will change according to the width of the tubular sleeve that has to be provided with gussets. It is understood that the depth of the gussets can be adjusted by controlling the placement of the profiled side devices (5), that are illustrated in the figures as discs but can of course be realised with adjustable profiled elements. It is therefore evident that the dimension, the structural proportioning and the building material could be adjusted according to the technological demands of different kinds of bagging machines. It should be underlined that all the devices that are based on the figures and the description as here attached, will be considered as part of the protection sphere of this invention. It is then clear that all kinds of application of a gusseting device, having characteristics as basically described, illustrated and hereinafter claimed, will be included in the basic subject matter of the invention.

Claims: CLAIMS 1) Device to realise lateral gussets during the unrolling of a roll of a tubular continuous sleeve of flexible material, as in claim 1, characterised by the fact that it includes a shaping equipment (3) inserted on the inside of the tubular continuous sleeve (1), supported from the outside of said sleeve by means of sustaining rollers (2) and kept in the right position by two upper external rollers (4). 2) Device, as in previous claims, characterized by the fact that, by co-operating and contrasting with the longitudinal side narro wings (6) of said shaping inner device (3), two profiled elements operate from the outside of the tubular sleeve, placed sideways and adjustable. Said profiled elements (5) are set-up by the two upper rollers (4) in order to fold the side edges (9) during the unrolling of the continuous tubular sleeve (1) from the feeding roll (10). 3) Device, as in previous claims, characterized by the fact that the shaping equipment (3) inserted on the inside of the continuous tubular sleeve (1) is made out of an hollow body of variable measure, dimensioned on the lower part as the width (8) of the tubular sleeve, in the medium part conformed to the rectangular section and in the upper part reduced to two parallel flat surfaces (7) that are purposely separated. In co-operation and contrast with theses two flat surfaces, two adjustable profiled elements operate, this way creating the shrinkage of the two lateral edges of the tubular sleeve and the consequent creation of two continuous lateral gussets (9). 4) Device, as in previous claims, characterized in the fact that the shaping equipment (3) inserted on the inside of the continuous tubular sleeve (1) is made out of an hollow body of variable measures, dimensioned at the bottom according to the width (8) of the tubular sleeve, conformed in the medium part to a rectangular section and reduced in the upper part to two parallel flat surfaces (7) purposely separated, co-operating and contrasting the latter surfaces, a single adjustable shaped element (5) operate, this way producing the shrinkage of a single edge of the tubular sleeve and the consequent creation of a single lateral continuous gusset (9).

Inventors: TAINO RICCARDO, TAINO, RICCARDO
Applicants: BL MACCHINE AUTOMATICHE, TAINO RICCARDO, B.L. MACCHINE AUTOMATICHE S.P.A., TAINO, RICCARDO
Application year: 1998
Main classification: B31B19
IPC codes: B31B19