Gummed paper taping unit with improved guidance of the paper in the dampening zone

Abstract: A description is given of a taping unit for gummed paper comprising a supporting group (1) for a reel (30) of gummed paper (2), a paper feeding group (17), a cutting group (19), a paper deviating group (28), a dampening group (10) with moistened bristles (32) placed downstream of said deviating group (28) and an application group (11) for applying single lengths of gummed paper onto the top or the bottom of a box. The paper deviating group (28) comprises at least two co-operating guide pads (26, 25), one (26) upstream of the other (25) in the direction of the forward movement of the paper. The downstream guide pad (25) defines, in front of the dampening group (10), a resting plane (34) for the paper, in front of which there extend from the upstream guide pad (26) and parallely to said resting plane (34) a large number of vertical wires set side by side (33) that provide for guiding the gummed paper lengths between said resting plane (34) and the bristles (32) of the dampening group (10).

Description: The present invention deals with a gummed paper taping unit with improved guidance of the paper in the dampening zone. Gummed paper taping units are used in carton sealing machines for delivering and applying short lengths of paper with moistened gummed face onto the top and/or bottom of boxes. Known gummed paper taping units, described in EP-A-0558122 and EP-A-0579329, comprise substantially a supporting group for a reel of gummed paper, a feeding group for extracting a continuous strip of gummed paper from said reel and having it move along a predetermined path with an oblique terminal portion, a cutting group situated substantially at the end of said oblique path portion for the purpose of cutting said continuous strip into single lengths of gummed paper, a paper path deviating group for positioning the paper in a vertical direction at the end of said oblique path portion, a dampening group with moistened bristles set downstream of said deviation group for dampening said gummed paper lengths and a group for applying the said gummed paper lengths onto the top or the bottom of a box. In said taping units the group for deviating the paper is made up of at least two co-operating guide pads which are placed one upstream of the other in the direction of the forward movement of the paper, and define an arcuated path portion for the paper and, downstream thereof and in front of the dampening group, a resting plane for the paper undergoing the dampening treatment. It has been possible to verify that the solution presently being used is not completely fit for very light gummed paper. As a matter of fact, in this case it can happen that the paper coming out of the upstream guide pad crinkles or is subject to other distortions and hence does not reach the desired correct engagement with the bristles of the dampening group. The taping unit jams up or, at the least, emits deformed paper lengths not fit for a correct sealing of the box. The purpose of this present invention is to realize a gummed paper taping unit that is able to guarantee a better and securer guide of the paper in the dampening zone. In accordance with this invention the aforementioned purpose has been achieved by way of a gummed paper taping unit of the type described in EP-A-0558128 and EP-A-0579329, characterized in that, in the group for deviating the paper, from the upstream guide pad and parallelly to the paper resting plane defined by the downstream guide pad there extend a plurality of vertical side-by-side arranged wires which provide for guiding the gummed paper lengths between said resting plane and the bristles of the dampening group. In this way, without any interference with the working of the dampening unit bristles, the guiding of the paper is made to continue even in the dampening zone, thus avoiding any deformation and jamming up of the paper, which reaches the application group with the right amount of dampening without any mishaps. The features of the present invention will be rendered even more evident by the following detailed description of a preferred embodiment of the same, illustrated by a non-limitative example in the following drawings in which: Figure 1 shows a side view of a taping unit in accordance with the invention; Figure 2 shows, on an enlarged scale, the paper dampening zone of the same taping unit; Figure 3 shows the aforementioned zone in cross-section according to lines III-III of Figure 2. With reference to Figure 1, the taping unit in accordance with the invention is essentially comprised of a plurality of operative groups fixed to a lateral support shoulder 8 to which corresponds, on the opposite side, a shorter shoulder 9 for side containment. More precisely, the taping unit comprises a supporting group 1 for a reel 30 of gummed paper 2, a paper control group 3 for controlling the unwinding of the paper 2 from the reel 30, a paper centering group 4, a couple of co-operating plates 5 and 6 for the guiding and sliding of the paper, a paper feeding group 17 and a co-operating contrast group 18, respectively associated with the two plates 5 and 6 for determining the intermittent forward movement of a continuous strip of paper 2 along a path with an oblique terminal portion, a cutting group 19 with a knife 31 associated with the feeding group 17 for separating paper lengths having pre-established lengths from the continuous strip of paper taken out of the reel 30, a dampening group 10 with moistened bristles 32 for the humidification of the glued face of the gummed paper lengths; and an applying group 11 for carrying out the application of duly moistened gummed paper lengths duly moistened on the boxes to be sealed. The construction features and the mode of operation of the aforementioned groups, which are of a kind per se known from the aforementioned document EP-A-0558122, will not be herewith described in detail; it is sufficient to point out that the plate 5, together with the feeding group 17 and the cutting group 19, is rotatable around an axis 21 defined by a fixed pivot on shoulder 8, in such a way as to permit opening of a substantial part of the paper path for the sake of maintenance or for avoiding that, in the event of long pauses and in the presence of humidity, the gummed paper can stick to one of the plates, thus jamming the taping unit. The rotation of the plate 5 is commanded by a release device 12 made up of a pneumatic cylinder 13 which is pivoted at 14 on the shoulder 8 and has a rod hingedly connected at 15 to a squared piece 16 fixed to the external housing of the feeding group 17. The transportation of the paper from the couple of plates 5 and 6 to the dampening group 10 is carried out by having the paper itself pass through a paper deviating group 28, composed of three guide pads 24, 25 and 26 that deviate the path of the paper towards a direction that is exactly vertical, idoneous for the application of the paper itself starting from the front end of the box 29 to be sealed. Guide pad 24 is positioned at the exit end of plate 5, immediately after the cutting group 19, and is rigidly connected to the external structure of the latter by means of a nut and screw 20. Guide pad 26, instead, is solid with shoulder 8, positioned exactly opposite to guide pad 24, in such a way as to form with it a thin arcuated passage for the paper towards the dampening group 10. Following the guide pad 24 and immediately downstream of the guide pad 26, there is rigidly connected to the shoulder 8 the guide pad 25, which defines a vertical resting plane 34 for the paper being moistened in front of the bristles 32 of the dampening group 10. As evidenced in Figures 2 and 3, from guide pad 24 there extend parallely from the aforementioned resting plane 34 of guide pad 25 a large number of vertical metal wires 33 placed side by side, which guide the gummed paper lengths between said resting plane 34 and the bristles 32 of the dampening group 10. In this way, without interfering with the action of the dampening bristles 32, the guiding of the paper is made to continue its way also in the dampening zone, thus preventing deformations and jamming of the paper, which reaches the application group 11 without mishap and with the right amount of dampening.

Claims: Gummed paper taping unit comprising a supporting group (1) for a reel (30) of gummed paper (2), a feeding group (17) for taking out of said reel (30) a continuous strip of gummed paper (2) and making it move along a predetermined path with an oblique terminal portion (5, 6), a cutting group (19) positioned substantially at the end of said oblique terminal portion for cutting said continuous strip of paper (2) into single gummed paper lengths, a paper path deviating group (28) for placing the paper in a vertical direction at the end of said oblique portion, a dampening group (10) with moistened bristles (32) placed downstream said deviating group (28) for dampening said gummed paper lengths and applying group (11) for applying the aforementioned gummed paper lengths onto the top or the bottom of a box, said deviating group (28) comprising at least two co-operating guide pads (26, 25), one (26) upstream of the other (25) in the direction of the forward movement of the paper, that define an arcuated path portion for the paper and, downstream thereof and in front of the dampening group (10), a resting plane (34) for the paper undergoing dampening, characterized in that from the upstream guide pad (26) and parallely to said resting plane (34) there extends a large number of vertical wires (33) placed side by side that handle the guiding of the gummed paper lengths between said resting plane (34) and the bristles (32) of the dampening group (10). Taping unit as claimed in claim 1, wherein said deviating group (28) comprises an additional guide pad (25) positioned oppositely to the upstream guide pad (26) for defining said arcuated path portion for the paper (2).

Inventors: MARCHETTI AUGUSTO, MARCHETTI, AUGUSTO
Applicants: MARCHETTI AUGUSTO, MARCHETTI, AUGUSTO
Application year: 1997
Main classification: B65B51
IPC codes: B65B51