US 2428769 A
Description (OCR text may contain errors)
Oct. 14, 1947. H. BOBST 2,428,769
SHEET REGISTERING MEANS Filed May 25, 1942 I INVENTOR- HENRI B01357 ATT'ORNEYJ.
Patented Oct. 14, 1947 UNITED STATES PATENT OFFICE Application May 25, 1942, Serial No. 444,400 In Switzerland May 3, 1941 Section 1, Public Law 690, August 8, 1946. Patent expires May 3, 1961 1 Claim. 1 In a number of machines working blanks, like rotative cutters rectifying the square of cardboard sheets, it is necessary that the front edge of said sheets penetrate the machine in a registered position, generally directed perpendicularly to the direction of the feeding.
In order to assume such a position, registering marks have already been used, particularly so called front registering marks, because they register the front edge of the blanks. Two registering marks are necessary and sufiicient for resolving the problem. They are rendered dependent one upon the other and it is necessary that each introduced blank initially simultaneously touches the two marks, after which the said marks are disengaged by one means or the other. This can be done particularly by the proper action of the blanks pressing against the marks until such disengagement. The same operation occurs, for example, in machines where the introduction of the blanks takes place by hand.
Figs. 1 and 2 of the drawing illustrate such an operation diagrammatically in perspective.
Figure 3 is a similar View showing a blank improperly presented to the registry marks;
Figure 4 is an elevation partly in section of a machine embodying the invention;
Figure 5 is a side view (enlarged) of the device forming my invention;
Figure 6 is a plan view of Figure 5, and
Figure 7 is a diagrammatic view showing the use of a marginal ruler used in association with the device of the present invention.
Figs. 8 and 9 are diagrammatic perspective views of a device of my invention, and which illustrate its operation.
A blank is pushed forward in the direction of arrow 2 toward two registering marks 3 and 4 being made interdependent by the intermediary of a rocking shaft 5.
As soon as the front edge of the blank touches simultaneously the two marks which determine the direction of said edge, the blank has just to be pushed forward by hand or mechanically in order to rock the marks in the direction of arrow 6, from the position shown on Fig. 1 to that shown on Fig. 2 which permits the blank to pass over and to be introduced into a machine (not shown) of any suitable kind for the working of the blanks.
Shaft 5 shall preferably be submitted to the action of an antagonistic spring accomplishing a double function: that of bringing the marks back to their starting position after each passage of a blank and that of preventing as a result of the opposed resistance, the pushing forward of the blank when it does not meet both marks.
In spite of this precaution, it occurs frequently that a blank is badly registered, i. e., introduced in the way shown by the schematic perspective 2 view of Fig. 3, on which a blank 1 is to be seen which touches only mark 4. When pushing it strongly forwards, especially where big heavy cardboard blanks are concerned, the turning of shaft 5 is effected, without having mark 3 accomplishing its function. It simply follows the movement of the mark 4 and without being itself contacted, turns with the shaft.
In order to prevent such an error, the machine according to the present invention is provided with a locking device for each registering mark disposed in such a way that the front edge of each blank is obliged to act at any given moment during its course of introduction, approximately simultaneously on the locking device and on the mark, but in such a way as to first meet the locking device, thus producing the unfastening of the mark.
Figs. 4 to 7 of the drawing represent one embodiment of the invention given by way of example, wherein the machine considered is a rotative cutter.
Fig. 4 is a longitudinal cross-section of the said rotative cutter, of which the marks are locked in the given Way. a
Fig. 5 shows, on a larger scale, a locking device and a part of the corresponding mark on which this device acts and which is met by the front edge of each introduced blank.
Fig. 6 is a corresponding plan View.
Fig, 7 shows in a plan view, a blank of cardboard in position of introduction to two registering marks and a margin ruler.
In the represented rotative cutter, the cardboard blanks to be out, are slid one by one on an even surface over table 8 from which they are introduced between the feeding cylinder 9 and the pressing roller IE), oscillating around pivot H. .A plurality of these rollers are distributed so as to engage the entire width of the blank; that is, on an axis perpendicular to the plane of the drawing. The pivots II around which these rollers ocsillate are supported by frame l2 of the cutter. The rock arms l3 can be submitted to the action of springs which can be regulated (or not) for the purpose of adjusting or modifying the pressure exerted by the rollers on the cylinder.
Adjacent to these introduction members are disposed the registering mark [4, the upper rotative cutters l5, lower rotative cutters l6, and lastly the delivering cylinders I! and I8. Arrows indicate the direction of rotation of these various members as well as the direction of the path of the blanks,
During their travel the blanks meet the abutment I9 of the mark, which they cause to rock by the intermediary of said abutment, as explained by Figs 1 and 2. The dotted line, ending in an arrow-head on Fig. 5, indicates the direction of rocking of the mark. But before engaging this abutment, which is split in its middle portion, the blanks meet a blade 29 disposed in this split section, and which projects out in front of the abutment. This blade forms part of a looking device rocking around a pivot 2!, which is in its turn supported by an arm of frame l2 and this device before being able to engage theabut ment of the mark. The movement thus given to the locking device brings it finally to the position shown in dot and dash lines on Fig. 5, and which operation of the device is more clearly depicted in Figs. 8 and 9. In Fig. 8, blank dis shown by arrow 23 as approaching the extended blade 29 of the lockin device. In Fig. 9, the blank d (indicated by dots and dashes) will be seen as having tripped the locking device which rises (in the direction indicatedby the rising arrow) to a position shown by line ef there disengaging the mark, and the blank d thus being permitted to pass under the locking device and engage the abutment of the mark and move the same forward from the locking device. In this position and at the spot where the edge of the blank presses against the edge of the blade, the said edge and the front of the abutment are in line,
and head 22 is free from engagement with the abutment. 7
The action started on the blade of the locking device continues on the mark in the way explained by Fig. 2, and after the blank has passed beyond the mark and the latter is freed from contact therewith the mark is return-ed to its normal position by rotation of the shaft on which it and all the other marks are mounted this rotation being effected by a spring (not shown) such as that referred to above in connection with Figs. 1, 2 and 3. r
The represented mark is,'however, dependent on another mark to which is adjoined an identical locking device. If therefore, the represented looking device frees mark l i without the second locking device simultaneously freeing the other mark, the blank cannot be, introduced. An incorrect introduction of the blank like the one represented in Fig. 3 is therefore prevented; on the contrary,
the front'edge of the cardboard blank must have pushed back the blades of the locking devices of the two abutments of the corresponding two marks of the machine and have reached both of the said ab-utments which (the locking devices) can then participate in the introduction movement as well as the two marks.
In the position of the blank according to the one in Fig. 3, mark d would be freed, but not mark 3; thus all efforts would be vain, as long as by a movement of blank I in its plane, the front edge of the blank has not been brought into contact as well with the abutment of mark 3.
After each passage of an individual blank, the
The correct registering of the'blanks can be done not only by hand but also mechanically, due to the fact that the feedingmembers 9 and I0 push the blank forward from allsides until it reaches the two marks. Here, the functioning is semi-automatic in the sense that the blanks are ,introduced by hand but afterwards they take the registered position after their start without any further manual help, being seized between the feeding cylinders 9 and rollers H].
Alternatively, a clearance between the posterior part of the abutment l9 and head 22 could also be provided, the blade 28 thennot projecting in front of the abutment. In this case, the blank would in the first instance meet the abutment and move it a little before dragging along'the locking device. Such a construction does not detract from the enjoyment of precision i registering the blank, but theintroduction of the blank is facilitated through a slight clearance between the starting oif position, properly called, and the outer limit, the most advanced position of the In certain cases, these rulers along which blanks are beingslid, can hinder the-movement which the blanks must execute in their own plane 7 in order to enter into contact with the marks. Thus, a blank presenting the bad square of blank 25 in Fig. 7 and which should, by this fact, be
able to turn in the direction of arrow 26, around its fulcrum on mark t, is prevented from so turn- It is evident that the application of this invention is not to be limited to rotative cutters or to the working ofcardboard blanks alone.
What I claim is: V 1
In a machine for working blanks a pair of registering marks carried by a common pivotal connection, each of saidmarks having a rearwardly extending abutment with a slot therein, a locking device for each mark comprising an arm normally engaging the said rearwardly extending abutment and a blade member movable with said arm around a common pivot, said blade member normally being positioned in front of said abutment in alignment with the slot therein so that a blank moving toward said abutment will first move said blade through said slot and cause said arm to pivot and be freed from engagement with said abutment.
REFERENCES CITED The followingreferences are of record in the file of this patent:
FOREIGN PATENTS Number Country Date 338,208 Great Britain Nov, 17, 1930 248,062 Great Britain Aug. 8, 1925' 432,210
.Great Britain July 7, 19 35