US826360A - Sheet-feeding mechanism. - Google Patents

Description

PATENTED JULY 17; 1906.

A. ROSENFELD. SHEET FEEDING MECHANISM.

APPLICATION FILED DEG. 9, 1903.

2 SHEETS-SHEET 1.

Witnesses;

$4M f/Q THE NORRIS PETERS cm, WASHINGTON, a. c.

PATENTED JULY 17, 1906.

A. ROSENFELD. SHEET FEEDING MECHANISM.

APPLIQATION FILED DEC. 9, 1906 2 SHEETS-SHEET 2.

TH: uonms PETERS 120., wnsnmc'mu, n. c.

UNITED STATES PATENT oFFIoR.

SHEET-FEEDING MECHANISM.

Specification of Letters Patent.

Patented July 1'7, 1906.

Application filed December 9,1903. Serial No.184.4=73.

To all whom it may concern:

Be it known that I, ARTHUR RosENFELD, engineer, a citizen of the Empire of Germany, residing at Vienna, in the Empire of Austria- Hungary, have invented certain new and useful Improvements in Sheet-Feeding Mechanism, of which the following is a specification, reference being had therein to the accompanying drawings.

It is known in sheet-feeders for printingpresses, folding-machines, and other similar machines in which the sheets of paper uppermost are pushed forward over the front edge of the pile one after the other by any device for example, a friction deviceto utilize the movement of the sheets for bringing into action or releasing any kind of mechanism, mechanical or electrical, which on its part again brings into action a suitable device, which has a definite function to performfor instance, the stopping of the friction or other feeding device. For this purpose a movable lever or member is arranged in the path of the paper sheets, which member is operated by the edge of the advancing sheet of paper, and thereby brings into action or releases the above-mentioned mechanism. Such mechanisms hitherto known in connection with sheet-feeders all possess the defect that either they are not released with suflicient ease by thin sheets or if this is the case'their poweras, for instance, a spring under tensionis not released with sufficient rapidity.

According to my present invention I employ toggle-levers inserted as transmitting medium between the releaser and the means to be released, together with an arm on the releaser-shaft and provided with a pawltooth, and a pawl at the junction of the toggle-links adapted to be released by the move ment of the releaser.

The toggle levers are preferably so ar ranged that when the tension mechanism is set the levers are stretched or extended almost into alinement. In this position they are held by a pawl fitted in the joint of the togglelevers, which pawl engages with and behind a locking-hook firmly secured to the releasing-lever. By the movement of this lever the pawl is released and the toggle-levers spring in. The lower end of the lower toggle-lever is in this arrangement journaled upon a fixed part of the frame, while at the upper end of the upper link thereof one arm of a bell-crank lever is jointed, its other arm being pulled by a spring, which here represents the power tensioned and to be released. The setting of the lever transmission takes place suitably in this way, that in the first place the arm of the bell-crank lever pressing on the toggle linkage is lifted, whereby the pawl is again brought into engagement with the locking-tooth of the releasing-lever. Thereupon the releasing-lever, which was previously turned from the path of the sheet of paper, is swung back and with its lockingtooth carries the pawl of the toggle linkage, so that this latter is again tensioned or set. In regard to a secure locking it is advantageous to here adopt an arrangement which at the leading back of the pawl renders possible a greater engagement of the locking-hook and the pawl than is suitable at the moment of release, which, however, shortly before the end of the return movement makes this engagement so sensitive that a proportionately slight movement of the releasing-leveris quite sufficient to release the tension mechanism.

The accompanying drawings represent, partially in diagram, examples of tension mechanism according to the invention.

Figure 1 is a side view of a simple tension mechanism with simple toggle linkage in the position of rest. Fig. 2 is a plan thereof. Fig. 3 represents in end view a form of toggle linkage. Fig. 4 shows the releasing device in the working position. Fig.- 5 represents the manner and fashion in which the tension mechanism is set.

In the machine-frame 1, Fig. 1, the releas ing-lever 3 is supported on the shaft 2, the lever being bent to a right angle at the bottom and extending under the supply-table 4 for the sheets of paper, so that the sheet is prevented from bending out. Over the table 4 are the usual-sheet-metal plates 5, intended to prevent the paper bending. The shaft 2 is suitably journaled in ball or roller bearings. Further, on this shaft 2 iskeyed an arm 6, carrying a pawl-tooth 7. This tooth 7 normally holds the pawl 8, which is jointed at 9 to the toggle-levers 10. The lower end of the lower toggle-lever 10 is pivoted on a pin 11, secured in the machine-frame 1, Figs. 1 and 3. To the upper end of the up er toggle-lever 10 is attached the arm 12 o a bell-crank lever pivoted on the bolt 13 of the machine-table. To the other arm 14 of this bell-crank lever is attached a spring 15, whose other end is secured to a fixed arm 16 of the machine-frame. If now by the advance of the sheet of paper 17, Fig. 4, the releasing-lever is moved, then the arm 6, with its pawl-tooth '7, turns downward and releases the pawl 8. The togglelevers spring together, and the spring can now exert its force.

In order to let the sheet 17 go smoothly through, the releasing-lever 3 must be swung out from the position of Fig. 4. The movement necessary therefor is advantageously utilized also for again setting the tension mechanism; but this can be attained in any other suitable manner. The release of the tension mechanism takes place early enough also when, for example, the following sheet is advanced too far, so that the releasing-lever and the arm 6 cannot take up their end position. (Shown in Fig. 1.) In this case the releasing-lever and the arm 6 are held by the paper sheet while the other parts of the releasing mechanism are moved into the initial position, whereby the pawl 8 is again re leased.

In order to lead back the lever transmis sion in the manner denoted, there is on the shaft 2 a sleeve 18, which on the one side is provided with an arm 19, on which is jointed a draw-rod 20. On the other side there is on the sleeve an arm 21, carrying a roller 22, lying under the arm 12 Further, on the sleeve there are two catches or lugs 23 and 24, which engage, respectively, the upper and lower sides of the arm 6, allowing this latter, however, the necessary play for releasing the pawl and limiting the movement imparted to it by the sheets. When the sleeve 18 rotates in either direction, the arm 6, and with it the releasing-lever 3, is moved by the lugs 23 241 after a slight interval or period of lost motion. After the device has assumed the position shown in Fig. 4 the draw-rod is moved by any of the driving parts of the sheet-feeders, so that the parts assume the position shown in Fig. 5. I/Vhen the mechanism is in this position, the arm 22, with its roller, is lifted and raises the arm 12, which again takes up almost the position shown in Fig. 1. The toggle-levers are thereby almost extended into alinement. The upper lug 23 presses against the arm 6 and carries same downward, so that simultaneously the releasing-lever is swung out of the path of the sheet of paper. The sheet of paper then passes through other usual mechanism. The pawl 8, in consequence of the stretching of the toggle-links is again advanced to the left, so that it falls over the pawl-tooth 7. Now a return movement of the rod 20 takes place and also a return movement of the parts secured to the sleeve 18. In this position of the mechanism the pawl 8 is in such a degree of engagement with the tooth 7 for the moment of release by the sheet that a snapping off is not possible even if it is considered that by the backward movement of the roller 22 the leverarm 12 has a tendency to move toward the toggle-levers; but when the releasing-lever follows the movement of sleeve 18, as above mentioned, the pawl-tooth 7 draws the pawl a little more, and so the toggle-levers are drawn back again completely into the position shown in Fig. 1. Just at the end of the back movement the pawl 8 is slightly lifted by a lug 25, which is also on the sleeve, and so the engagement of pawl 8 and tooth 7 is reduced to the sensitiveness requisite for the moment of release. Thus, on the one hand, the engagement between pawl-tooth and pawl 8 during the return of the rel'easingle ver into its working position is entirely and thoroughly secure, so that the releasing of the tension mechanism in consequence of any shocks whatever arising cannot take place prematurely, and, on the other hand, the tension mechanism at the conclusion of this movement is prepared for the next release.

Having thus described my invention, what I claim is 1. In a device of the character described the combination with a releaser, of togglelinks interposed between the means to be released and the releaser, the releaser-shaft, an arm thereon provided with a pawl-tooth, a pawl at the junction of the toggle links adapted to engage said pawl-tooth and to be released by the movement of the releaser.

2. In a device of the character described the combination with a bent-spring releaserlever, of toggle-links interposed between the means to be released and the releaser, the releaser-shaft, an arm thereon provided with a pawl-tooth a pawl at the junction of the toggle-links adapted to be released by the movement of the releaser.

3. In a device of the character described the combination with a bent-spring releaserlever, of toggle-links interposed between the means to be released and the releaser, the releaser-shaft, an arm thereon provided with a pawl-tooth, a pawl at the junction of the toggle-links adapted to engage said pawl-tooth and to be released by the movement of the releaser, a bell-crank lever connected with said toggle-links, and a spring connected with a short arm of said lever.

4. In a device of the character described the combination with a bent-spring releaserlever, of toggle-links interposed between the means to be released and the releaser, the releaser-shaft, an arm thereon provided with a pawl-tooth, a pawl at the junction of the toggle-links adapted to engage said pawl-tooth and to be released by the movement of the releaser, a bell-crank lever connected with said toggle-links, and a spring connected with a short arm of said lever, a sleeve on the releasershaft having an arm means for actuating said sleeve and a roller carried by said arm and lying under the long arm of the bell-crank lever.

5. In a device of the character described the combination with a bent-spring releaserlever, of toggle-links interposed between the means to be released and the releaser, the releaser-shaft, an arm thereon provided with a pawl-tooth, a pawl at the junction of the toggle-links adapted to engage said pawl-tooth and to be released by the movement of the releaser, a bell-crank lever connected with a short arm of said lever, a sleeve on the releaser-shaft having an arm and a roller carried by said arm and lying under the long arm of the bell-crank lever, and lugs on said sleeve and adapted to be disposed on opposite sides of the arm carrying the pawl-tooth and means for actuating said sleeve.

6. In a device of the character described the combination with a bent-spring releaser= lever, of toggle-links interposed between the means to be released and the releaser, the releaser-shaft, and an arm thereon provided with a pawl-tooth, a pawl at the junction of the toggle-links adapted to be released by the movement of the releaser, a bell-crank lever connected with a short arm of said lever, a sleeve on the releaser-shaft, having an arm means for actuating said sleeve a roller carried by said arm and lying under the long arm of the bell-crank lever, and lugs on said sleeve and adapted to be disposed on opposite sides of the arm carrying the pawl-tooth and a further lug on said sleeve for lifting said pawl at predetermined periods.

In testimony whereof I hereunto afiiX my signature in presence of two witnesses.

ARTHUR ROSENFELD.

WVitnesses:

FRIEDRICH BINDER, ALvEs'ro S. HOGUE.

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