FR2476615A1 - FEEDING DEVICE IN SHEETS OF A PROCESSING MACHINE - Google Patents

Abstract

MARGIN DEVICE PLUS SPECIALLY INTENDED TO EQUIP A MACHINE FOR SHAPING CORRUGATED BOXES. IT INCLUDES A FRONT SUCTION BOX 12 AND A REAR PUSHBUTTON 8 MOVING BACK AND BACK IN CONCORDANCE OVER A LENGTH C. THE VACUUM IS THEN RELEASED ON THE BOX, WHICH STOPS AS THE PUSHBUT CONTINUES ITS TRAVEL . A RAISED REAR STOP 10 CARRIES THE REAR OF THE BATTERY 2. IN OPERATION, THE ADVANCED BOX 12 RELEASES THE REAR OF THE LOWER SHEET 13 WHICH THEN FALLS ON TABLE 4 WHERE IT IS TAKEN UP BY PUSHBUTTON 8.

Description

The present invention relates to a feeding device

  tation of a processing machine, such as a feeder

  intended to equip a machine for shaping corrugated boxes.

  Suction feeders, such as that described in US Pat. No. 3,226,108, are known in which the sheet to be marbled is made integral with a box on which a vacuum is applied in a cyclic manner. caisson being by

  elsewhere animated by a longitudinal back-and-forth movement

  gement with a drive of the sheet by rollers placed directly downstream of this box. These devices allow sheets to pass under the margin knives located downstream of the feeder without risk of jamming. On the other hand, it arrives with such devices, in particular when thin sheets are processed, so light, that they are crossed, or "delta", the lateral edges remaining behind the upstream front of the sheet which gives a bad introduction. Conversely, in the case of the treatment of thick sheets so rather heavy, they have difficulty to be driven exactly to the register, which

  disrupts the operation of the machine.

  Also known devices, such as that described in the French patent of the applicant published under No. 2,239,881, wherein the sheet to be pushed is pushed by a claw rule with a longitudinal movement back and forth , the sheet being otherwise subjected to a low depression which the plate and right on a flat structure called margin table. This kind of

  device provides a better discharge of the sheet than the

  mentioned above, but the passage of it under the

  Margin knives is difficult which leads to market risks.

  rabies and therefore destruction of leaves.

  The feeder according to the invention makes it possible, while not having the disadvantages of the foregoing devices, to have the margin safety under the knives inherent in the suction feeders of the prior art while having a perfect safety in the register, which whatever the thickness of the cardboard. It comprises, in a manner known per se, a flat and substantially horizontal margin table, a front stop or "margin knife" allowing to pass one leaf at a time, and a back pusher animated with a movement of va-and longitudinal-shaped and constituted by a rule of margin or a set of aligned claws, presenting in all cases a front machining in the form of heel to receive the rear edge of the sheet to be pushed, and is characterized in that it comprises in in addition to a rear stop for supporting the rear of the packet of sheets and placed above said pusher, one or more suction boxes located (s) at the front and under said margin table and animated (s) a movement of longitudinal reciprocation via a transmission linked to that moving said pusher so that their races are substantially matched during at least a first part of the race

  before said pusher corresponding at least to the longitudinal distance

  dide of support of the package by said rear stop, said box or caissons being connected to a device putting them in depression during said match agreement before and then releasing

said depression.

  The invention will be better understood from the description

  following example of an embodiment of a feeder intended to equip a machine for shaping corrugated cardboard boxes, with reference

  to the accompanying drawings in which -

  FIG. 1 is a schematic side view of the feeder of the invention; FIG. 2 is a representative graph of the races of the

pusher and suction box.

  Referring to Figure 1, the feeder of the invention comprises the following conventional elements known devices, such as for example that described in the French patent published under number 2.239.881.88

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  a magazine 1 for the packet of sheets 2 to be dispensed, a flat and substantially horizontal structure 4 called a "margin table", a part of which partially encompasses its half

  upstream is placed under low vacuum by a box 5 connected to a fan.

  as in the case of the aforementioned patent. In the case considered, the box 5 extends in width about two thirds of the table 4 and in length about three quarters of it - a front stop 3, called "knife", positioned in height relative to in the table 4 so as to let only one sheet to the driving rollers 7, - a pusher constituted by a margin rule 8 usually having a front bead 9 for receiving the rear edge

of each sheet.

  Furthermore, the feeder of the invention further comprises - a fixed rear stop 10 for supporting the rear portion of the package 2, placed immediately above the margin rule 8, and provided with an advanced length II L - a movable suction box 12 similar to that described in US Patent No. 3,226,108, placed under the front of the margin table 4, and connected to a vacuum pump via a solenoid valve 13 and a pipe 14; as in the case of the aforementioned US patent, the housing 12 may be driven by a longitudinal reciprocating movement around the end stop 3, its maximum recoil position being that shown in solid lines and its advanced position

  the maximum being that shown in dashed lines on the drawing.

  According to the invention, the caisson 12 and the rule 8 are kinematically connected to each other so that their respective longitudinal reciprocal strokes are conjugated according to the graph of FIG. race angle 6 is carried in absisses, the travel distance c on the ordinate, the curve relative to the caisson 12 being drawn in strong line and that relating to the rule

8 in fine line.

  As we see on the graph, where the zero is the position

  , - extreme distance of the two elements, the races are at the beginning

  coincidentally on a length C greater than the length L of the advance Ilde the abutment 10; then rule 8 continues its course

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  while the housing 12 remains substantially stationary, the latter returning back during the last phase of the backtracking of

Rule 8.

  Furthermore, still according to the invention, the solenoid valve 13 is controlled, for example by a conventional control with photocells sensitive to the longitudinal position of the box 12, so that the vacuum is applied to the box 12 during the first part C of the corresponding race

  to his progress, then be released later.

  As can be seen in FIG. 1, the respective cycles according to the graph of FIG. 2 are carried out by conventional means with a set of connecting rods and crank-rod in the following manner: A set (15, 16) with a linked crank-rod kinematically to the drive rollers 7 communicates an oscillating movement to a shaft 17 carrying a lever 18. The lever 18 communicates its oscillation movement on the one hand to the box-12 via a first set of connecting rods (19 20) and secondly to the rule 8 by means of a second set of connecting rods (21, 22), these sets of connecting rods being arranged, for example as in the figure, so as to

  to communicate to Box 12 and Rule 8 long-term movements

  conjugated dinals in accordance with the graph of Figure 2.

  The operation of the device which has just been described is as follows: The starting position being that represented in FIG. 1, the rule 8 and the box 12 are in the maximum retracted position, the rear part of the sheets being raised and supported. by the advance 11 of the stop 10, the front edge of the box 12 being substantially vertical to the knife 3 and the heel 9 of the rule 8 slightly behind the vertical of the rear edge of the lower sheet 23

to introduce.

  The vacuum being applied to the box 12 by opening the solenoid valve 13, the latter then drives the lower sheet 23 of the package 2. When the sheet 23 has traveled its support distance by the advance 11, the maximum equal L, it falls on the table 4 by coming to press against it with the light suction due to the box 5, its rear edge being positioned against the heel 9 thrust Rule 8 which in the meantime advanced 12. When the box 12 and rule 8 have traveled the match race C, the vacuum on the box 12 is released so that its action on the sheet 23 is stopped, but against the rule 8 continues its action. advance by always pushing the sheet 23 until finally introduce it between the rollers 7, which then continue its training, and go back according to

the graph of Figure 2.

  To stop the introduction without stopping the entire machine, it is sufficient, by action on the solenoid valve 13, to completely release the vacuum on the box 12. The latter, despite its movement back and forth can not then more drive the lower sheet 23 which remains in position on the advance 11, the rule 8 also having no action on it, since it then passes continuously

below her.

  It will be noted that with the device of the invention, the thrust heel 9 may have a height greater than the thickness of a

  sheet, so that it is possible to have maximum efficiency

  male push even with thin sheets, especially without risking to damage the back edge. Furthermore, in the case of a lower sheet 23 which would be tiled or curved, therefore unable to pass under the knife 3 which, with the previous devices would cause a jamming of the carton, the box 12 would then aspire only the air so that the back of the tiled sheet 23 would remain

  on the advanced He and the introduction would be stopped without loss of material.

  Finally, in the event of a registry failure, the sheet having for example

  patina on the casing 12, the device of the invention makes it possible

  this fault, because the sheet will be recaled to the next cycle on the

  heel of the ruler, thus regaining his good margin position.

  The invention finds its most interesting use

  in the corrugated box manufacturing industry.

Claims (2)

  1 - Device for feeding sheets of a machine   treatment, of the type comprising a flat and substantial margin table   horizontally horizontal, a frontal abutment or "margin knife" allowing to pass one sheet at a time, and a back pusher moved longitudinally back and forth, characterized in that it further comprises a stop rear end (10) for supporting the rear of the stack of sheets (2) and placed above said pusher (8), one or more suction boxes (12) located at the front and under said margin table (4) and moved longitudinally by a transmission (19, 20) linked to that (21, 22) moving said pusher (8) so that their races are substantially in agreement during   at least a first portion (C) of the forward stroke of said pusher.   corresponding at least to the longitudinal distance (L) of support of the pack (2) by said rear stop (11, 10) or said boxes (12) being connected to a device (13, 14) putting them in depression during said concordance (C) racing before and then relaxing said depression.   2 - Device according to claim 1, characterized in that the or said caissons (12) is / are linked (s) said pusher (8) 'by a linkage kinematic lever (18) and set of rods (20, 19 and 21, 22) as well as to the drive rollers (7) located at the front of said device via a connecting rod-crank (16, 15).