Automatic labelling machine for bags of mesh or the like

Abstract: Improvements in the object of the European patent No. 0542663 for an automatic labelling machine for packers in bags of mesh or the like, which have: a second roller (101) with its counter roller (102), some independent means of activation (120), (121), and (123) of the means of cutting (16), of the cart (18), and of the finger (27) with claws (28); the printer head (10) and the counter roller (102) both being mounted on elastic laminar supports (112) and (104), with keying in their respective operating position; and mechanical linkage of turning (127) and (128) of the second roller (101) and of the roller (6).

Description: FIELD OF THE INVENTION The present invention refers to an automatic labeling machine for bags of mesh or the like, as set forth in the preamble of claim 1. A machine of this type is known from EP-B- 0 542 663. BACKGROUND OF THE INVENTION This known automatic labeling machine for mesh bags or the like includes a label bobbin mounted in a frame and means for feeding a continuous tape of labels, means for guiding said tape, means for cutting the tape and control means, and it further includes means for advancing the tape by a roller having an anti-slip surface and extending transversely with respect to the tape guiding means, said tape being pulled toward an outlet of the machine by revolution of said anti-slip roller driven by a motor and through associated transmission means. The labeling machine comprises a printer head, preferably a thermo printer head, which is applied against the label, which is preferably heat sensitive. The printer head is urged against said labels by elastic means in the zone in which the tape is supported by said roller. The head is fixed at a longitudinal bar mounted on a transverse shaft which is mounted in the frame of the machine, so that the head may be removed from said tape by pivoting said bar around the shaft. Said automatic labeling machine has a carriage which moves back and forth along a supporting plate extending downwardly and fixed to the frame, which plate has guiding means for the end of the label tape, a longitudinally extending central channel having a suitable transverse profile, said channel being continued in a prolongation extending downwardly and also equipped with said suitable profile for guiding the label tape. Both sides of the carriage are traversed by a shaft to which links are fixed outside said carriage. One end of the shaft projects with respect to one of said links, defining a projection and equipped with a sleeve affixed thereto, while the other end of the shaft projects from the other link and has connected thereto a cam. The free ends of the links are rigidly connected by a brace, at whose intermediate part a finger is affixed having at least one claw able to enter into the channel and to engage the label cut from the tape by a cutter, for pulling it to the outlet of the machine. The means for actuating the carriage are articulated to means pivoting the brace on which the finger is fixed. A retaining lever is pivotally mounted to the frame and equipped laterally with a notch into which the projection bearing the sleeve is introduced for turning the link when the carriage is in its position closest to the cutter, and said retaining lever is urged against said projection by elastic means. At its free end, the retaining lever presents an inclined edge against which slides the sleeve during a part of the back and forth strokes of the carriage, and the link has a stop situated in an advanced position with respect to the projection which, when the carriage moves forward (toward the outlet of the machine) it displaces the retaining lever outwardly, releasing the projection from the notch. During the advance of carriage, the cam of the turning shaft of the links actuates the cutter for the separation of the leading label from the label tape through associated motion transmission means. The labeling machine of EP-B- 0 542 663 affords a series of advantages with respect to the labeling machines already known, nevertheless, it is the object of the invention to further improve the labeling machine of this known type. SUMMARY OF THE INVENTION This object is attained by the features of claim 1. Preferred embodiments of the invention are subject matter of the dependent claims. The improvements imparted to the labeling machine by the present invention afford, among others, the following advantages: They permit an increased traction force at the label tape effected by the second roller and its associated counter roller, which ensures the pulling and transport of the label tape even if the surfaces of said tape is slippery. The roller confronting the printer head may only apply a lower tension to the tape, by the limitation which is imposed for its correct operation. Adjustments of the machine and of the synchronization of its operating phases are facilitated. The maintenance of the tension applied by the counter roller of the second roller and by the roller facing the printer head is ensured, preventing errors of the user in the operational positioning of both. A wide separation of the printer head and of the counter roller with respect to the label tape is enabled in the non-operative position, whereby access of the user to perform various operations, such as adjustment and maintenance, is facilitated. Finally, the synchronized rotation of the two additional rollers is ensured. The invention will now be described in greater detail with reference to the accompanying drawings showing an embodiment, to facilitate the comprehension of the characteristics and to explain various details. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a side elevation view of the machine with the receptacle for the bobbin of the label tape being partially cut away and some parts being omitted to be able to assess the course of the label tape from the bobbin to the cutting zone; Fig. 2 is a cross section along A - B of Fig. 1 with the receptacle for the bobbin being partially cut away and the guiding channel of the label tape, the printer head and its support and the detail of the supporting plate of the labels and of its prolongation being omitted, to facilitate the understanding of this section of the machine; Fig. 3 is a side elevation view of the machine in larger scale than in Fig. 1, in which the receptacle for the bobbin and the guiding channel of the label tape are omitted; Fig. 4 is the view of the machine according to Fig. 3 turned by 180°; Fig. 5 represents in larger scale some details of the supporting plate of the label; and Figs. 6 and 7, respectively, are sections along C - D and along E - F of the supporting plate of Fig. 5. DESCRIPTION OF AN IMPLEMENTATION ACCORDING TO THE INVENTION In the drawings the parts or elements of the labeling machine already described and drawn in EP-B- 0 542 663 are indicated with the same reference numerals as in EP-B- 0 542 663, whereas the parts or elements which are modified are indicated with new reference numerals having three digits. For the explanation of the basic design of the labeling machine, reference is made to the description and drawings of EP-B- 0 542 663, the contents of which is incorporated in this specification by reference. Therefore, in the following, only those features and characteristics are explained which distinguish the present invention over the known machine. According to Figs. 1 to 3, the automatic labeling machine for goods packed in mesh bags or the like comprises a second roller 101 and an associated counter roller 102, both having an anti-slip surface, which is obtained, for example, by a covering of rubber or the like. These rollers 101 and 102 are arranged transversely with respect to the guiding channel 3 of the label tape T, the latter being pulled by the roller 101 and the counter roller 102, conjointly with the roller 6. The labeling machine has a support S for its attachment to the packaging machine to which it is applied, normally a bag forming machine (Figs. 1 to 4). The support 103 of the counter roller 102 has an elastic sheet 104 at the free end of which the counter roller 102 is supported. The support 103 is pivotally mounted through a shaft 105 and has on its other free end a knob 106 to manually pivoting said support 103 counterclockwise in Figs. 1 and 3 to separate the counter roller 102 from the label tape T and the roller 101. The operative position of the counter roller 102, applied against the roller 101 with intercalation of the label tape T, is locked by a pin mounted at the knob 106 and urged outward by a spring to enter in an orifice 107 provided in a flange 108. The flange 108 is pivotally mounted to the frame 2 on a shaft 105 and may be fixed into position at the frame 2 by a bolt or the like countersunk into an orifice 109 of said flange 108. To be able to adjust said operating position there is an oblong orifice 110 in the frame 2. The printer head 10 of high definition is mounted, in the same way as the counter roller 102, at a support 111 fixed at an elastic sheet 112, said support 111 having a pivot shaft 113, a knob 114 with an associated locking pin and spring for its locking into an orifice 115 of a pivotal flange 116 with an orifice 117 for the fixing of its position at the frame and the adjustment of the operating position of the printer head 10. An oblong orifice 118 is formed in the frame 2 to permit said adjustment. The only difference between the mounting of the printer head 10 with respect to the mounting of the counter roller 102 is that in the first the sheet 112 is fixed to a short bar 119 suitably adjusted in an orifice of the support 111 which permits swivel motion of said head 10 around the axis of said bar 119 for a better adaptation of the head 10 against the upper surface of the labels intercalated between the head 10 and the roller 6. Putting the counter roller 102 and the printer head 10 into operating position, the user displaces the knobs 106 and 114 against the elastic action of their respective springs (not shown), whereby the pins mounted in said knobs are raised and separated them from their associated orifices 107 and 115, respectively, so that a turning movement in the counterclockwise direction of the support 103 and clockwise of the support 111 according to Figs. 1 and 3 is possible, so that the counter roller 102 and the head 10 are separated from the label tape to the desired extent, to make these zones of the machine accessible to perform operations of maintenance, tests, adjustments, and other operations thereon. The moving blade 16 of the cutter for separating the leading label from the tape is actuated by independent first drive means, formed in this example by a double-acting pneumatic cylinder 120 (Figs. 2 to 4) whose piston rod is articulated to the moving blade 16. The displacement of the carriage 18 is carried out by independent second drive means which in this example are formed by a double-acting pneumatic cylinder 121 (Figs. 1, 2, 3, and 4) which is linked to a support 122 which is in turn mounted to the carriage 18. The pivotal movement of the finger 27 with the claws 28 is produced by independent third drive means which in this example are formed by a double-acting pneumatic cylinder 123 (Figs. 2 and 4) whose piston rod is articulated to the link 23 which is in turn rigidly fixed to the link 24 (Figs. 1 to 3) by the brace 26 (Figs. 1, 3, and 4) to which the finger 27 is fixed. The pair of links 23 and 24 are pivotally mounted to the carriage 18 by the transverse shaft 22 which extends through the carriage 18. It is possible to substitute said shaft 22 by two studs fixed to both sides of the carriage 18 and aligned with one another. The independent first to third drive means 120, 121 and 123 may be of any other conventional form to obtain the alternating or back and forth displacement of the moving knife 16, of the displacement of the carriage 18, and the pivoting of the finger 27. The gear motor 7 has a pulley 124 which is linked to another pulley 125 joined to the roller 101 through a chain 126 (Figs. 2 and 4 and shown in dotted lines in Fig. 1). The roller 101 is fixedly connected to a toothed gear 127 which meshes with another toothed gear 128 fixedly connected to the roller 6 so that the turning of the pulley 124 of the gear motor 7 causes the turning of the roller 101 in the direction of advance of the label tape T and the turning of the toothed gear 127 causes the turning in the opposite direction of the toothed gear 128 and as a result of that, the turning of the roller 6 in the direction of advance of the label tape T downwardly. In Fig. 4 are represented the arrows indicating the described turning directions. To adjust the tension of the chain 126 the gear motor 7 is mounted on the frame 2 by attachment means, such as bolts with nuts which traverse oblong orifices 129 (in Fig. 4 three such orifices are shown) and the shaft of the gear motor 7 traverses another oblong orifice 130 to permit said adjustment. The roller 6 has joined to it a knob 131 (Fig. 2) for its manual rotation. Manual turning of said roller 6, thereby turning the roller 101 through the pair of toothed gears 128 and 127 is done to perform tests and adjustments on the labeling machine. The transmission means between the gear motor 7 and the roller 101 may be comprised of conventional components other than the chain 126 described above. Moreover, the electric motor which is a part of the gear motor 7 may have a brake, for example electronic by inversion or other conventional one, for the cyclic stopping of same during the operations of the labeling machine. The supporting plate 19 of the labels has a central longitudinal channel 132 (Figs. 5 to 7) and a stepped interior 133 which extend in the prolongation 19a as represented in said Figs. 5 to 7. This channel and steps favor the engagement of the label by the claws 28 of the finger 27 at time a certain curve is produced in the label, facilitating the correct delivery of same to the packaging machine and favor the application of the means for affixing the label to a bag or the like. The control and the coordination of the different movements of the labeling machine can be carried out by a computer, connected to the various organs and means of the machine and to control means for the user. In the labeling machine equipped with the improvements of the invention there has been eliminated, with respect to EP-B-0 542 663, the projecting ends of the shaft which traverses the two sides of the carriage, which has on one end a projection and whose other end is equipped with a cam, the articulation of the means moving the carriage with the means pivoting the brace to which the finger with claws is fixed, and the retaining lever. The operation of the labeling machine in question is, along general lines, the following: Starting with the phase in which the label tape is already installed and arrives at the printer head 10 and is supported on the roller 6, the printer head 10 having already carried out the printing upon the label, the gear motor 7 turns the rollers 101 and 6 in the direction indicated by the arrows in Fig. 4 until the leading label of the label series which is to be printed is engaged by the finger 27 which has pivoted from the formerly raised position I of Fig. 1 to the lowered position II indicated in broken lines in Fig. 1, by the operation of the pneumatic cylinder 123, at which time the pneumatic cylinder 120 is operated which displaces the moving blade 16 of the cutter to perform the cutting which separates the label from the label tape. Subsequently the pneumatic cylinder 121 is operated which moves the carriage 18 down and thereby advances the label engaged the finger 27 with its claws 28 applied against the label, or its appendix if there is one, by introducing its center part into the channel 132 and in the steps 133 of the supporting plate 19 and of its prolongation 19a (position III of maximum descent of the finger 27 represented in Figs. 3 and 4) to present said label to the packaging machine for the attachment of said label, for example by a staple, to a bag or the like conformed and filled with the desired product in said packaging machine. The cited pneumatic cylinders will return the moving blade 16 to its open or idle position, the finger 27 to its open or separated position I removed from the support plate 19 and the carriage 18 to its upper position shown in Fig. 1 at an appropriate timing. The cycle is repeated for each label.

Claims: An automatic labeling machine for containers in form of bags of mesh or the like, having a'bobbin of a continuous tape of labels to be fed one by one to a machine for filling said containers with products, further comprising: guide means (3) affixed to a frame (2) for guiding said tape (T), a cutter (16) to separate labels from said tape (T), control means and a driven first anti-slip roller (6) to advance the tape (T) and arranged transversely to the guide means (3) and by which the tape (T) is supported to be drawn to the outlet of the labeling machine, a printer head (10) for label printing when applied to the surface of the tape (T) in a zone in which the opposite surface of the label tape (T) is supported by said first roller (6), said printer head (10) being pivotally mounted on a support (111) provided with manual operation means (114) to remove said printing head (10) from said label tape (T), a carriage (18) which is arranged downstream of said first roller (6) and is downwardly displaceable by actuation means forth and back along a support plate (19) having a guide means to guide the label tape (T) during the displacement, and a central, downwardly extending channel (132) having a shaped transverse profile and having a prolongation (19a) of the support plate (19) also provided with said shaped profile, a pair of links (23, 24) articulated in a common axis to the outside of said carriage (18), the free ends of said links (23, 24) being connected by a brace (26) to which a finger (27) is fixed having claws (28) for engagement with a label cut from said tape (T) and advancing same within said prolongation (19a) of the support plate (19) upon downward movement of the carriage (18), characterized by a second roller (101) and an associated counter roller (102) mounted on a support (103) provided with manual operation means (106), both rollers (101, 102) having an anti-slip surface and being situated upstream- in relation to the feed direction of a label tape (T) - with respect to the first roller (6) facing the printer head (10) and arranged in parallel to said first roller (6), by which second roller (101) and its counter roller (102) together with the action of the first roller (6) the label tape (T) is pulled; by independent drive means (120, 121, 123) for the cutter (16), for the displacement of the carriage (18) and for the pivoting of the finger (27); by both the printer head (10) and the counter roller (102) being mounted on their respective supports (111, 103) via elastic sheets (112, 104), and said supports (111, 103) being independently operable to remove said printing head (10) and said counter roller (102) from said label tape (T); and by both first and second rollers (6, 101) being mechanically linked (127, 128) for joint rotation in opposite directions, one of said rollers being driven by motor means (7) through associated drive transmission means (124 - 126). A machine as set forth in claim 1, further comprising locking means (109, 115) for fixing said head (10) and said counter roller (102) in their operational positions. A machine as set forth in claim 2, further comprising adjustment means (110, 118) to enable an adjustment of the operational positions of said head (10) and counter roller (102).

Inventors: DAUDER GUARDIOLA AGUSTIN, DAUDER GUARDIOLA, AGUSTIN
Applicants: DAUMAR TALLERES, TALLERES DAUMAR S.A.
Application year: 1998
Main classification: B65C9
IPC codes: B65C9, B65C3