US2726863A - Sheet registering mechanism - Google Patents

Description

Dec. 13, 1955 ALBRECHT 2,726,863

SHEET REGISTERING MECHANISM Filed Aug. 22. 1950 2 Sheets-Sheet l //1 VAT/V7 0/9.

Dec. 13, 1955 A. J. ALBRECHT 2,726,863

SHEET REGISTERING MECHANISM Filed Aug. 22, 1950 2 Sheets-Sheet 2 I I a \l/ j ig-M w Alexander J. Albrecht, West United States Patent'G SHEET REGISTERING MECHANISM New York, N. J., assignor .to R. Hoe & Co. Inc., New York, N. Y., a corporation of New York Application August 22, 1950, Serial No. 180,786

4 Claims. (Cl. 271-56) This invention relates to improvements in sheet registering mechanism.

The general object of the invention is to provide improved means for stripping a mis-registered sheet from a registering cylinder.

With this, as well as other objects, which will appear in the following description, in mind, a preferred embodiment of the invention will now first be described with reference to the accompanying drawing and the features forming the invention will then be pointed out in the appended claims.

In the drawing, Figure 1 is a cross-section of a registering cylinder, with stripping mechanism according to the invention, and Figures 2 and 3 are similar views showing the parts in difierent operating positions. Fig. l-A is a detail view showing the actuating mechanism for the sheet stripping mechanism.

In Albrecht application Serial No. 102,682, filed July 1, 1949, for Sheet Registering Mechanism (now Patent No. 2,642,283, issued June 16, 1953), there is disclosed a registering cylinder in which the detecting mechanism actuates a number of sheet ejector rods which lift the leading edge of a mis-registered sheet from the cylinder surface just prior to the time when the grippers, or sheet taking elements, close to take the sheet. This eliminates the need for gripper opening and stripper mechanisms, such as shown in Huck Patent 2,231,914, for removing a mis-registered sheet from the grippers, but it has been found preferable to forcibly remove a this-registered sheet from the cylinder and direct it away from running parts of the machine. The present invention provides additional mechanism, useable with the registering cylinder of the said application, and comprises stripper rollers swingable into and out of operative relation to the cylinder, together with operating mechanism controlled by the detector shaft of the cylinder.

In the drawings, there is shown only so much of the structure of the above mentioned application as is necessary to an understanding of the present invention. The cylinder 1 is journalled by means of its shaft 2 in frames, part of one of which is indicated schematically at 3, and is driven in time relation to the sheet supplying and sheet taking mechanisms, as usual, a sheet S being fed to the cylinder at the proper point in each rotation. Driven tapes 4 hold the sheet S on the cylinder and urge it forward against front stops 5. The detector shaft 6 carries a cam follower 7, cooperating with a cam 8 rotating counterclockwise as indicated. Ejector rods 9 serve to lift the front edge of a mis-registered sheet to prevent it being taken by the sheet forwarding grippers 10. The operating cycle, as more fully described in the above mentioned application, involves two alternatives, depending on whether the detector mechanism finds the sheet to be properly registered or not. First, if a sheet is properly registered: the detector shaft 6 will rock clockwise as the cylinder rotates slightly past the position of Figure 1; the plungers 9 will remain in the retracted position of Figure 1; and the grippers 10 will close and take the sheet. The grippers 10 are carried on a gripper bar 10 of the type shown in Patent 2,642,283, above referred to, which gripper bar is temporarily supported in the position shown in the cylinder, on rollers 10 As indicated in the said patent, the gripper bar is also connected to conveyor chains (not shown herein) which bring it to and take it away from the location of the cylinder as shown, at appropriate pointsin the operating cycle of the mechanism. The specific manner of moving the gripper bar to and from the cylinder is not involved in the present invention, which is concerned with .the operation .of the grippers 10 and with whether or not they takea sheet S in position on the cylinder, which action, if it occurs, is accomplished by the gripping of the forward end of the sheet by the grippers, so that they have control of the sheet. Second, if the sheet is mis-registered: detector shaft .6 will remain in the position of Figure l; ejector rods 9 will be forced out as indicated in Figure 2, lifting the leading edge of the sheet away from the grippers 10; and the grippers will close but will not take the sheet. The shaft 6 is operated to control the stripping mechanism in the manner now to be explained.

A plurality of short stripper rollers 11 are spaced along and secured on a shaft 12 rotatably carried by arms 13 which swing freely on a shaft 14 that is rotatably supported in the frames 3 and drives a roller 15 which is secured thereto. The shaft 12 is driven by gearing (not shown) from the shaft 14, which in turn is driven preferably by other gearing (not shown) from the cylinder 1. The stripper rollers 11 coact with the roller 15 carrying the tapes 4 and are driven counterclockwise as indicated. The shaft 12 is swung about the shaft'14 by a cam follower arm 16 attached to an arm 13 and cooperating with a cam 17 rotating with the cylinder 1. The arm 16 extends upwardly above the shaft 14 and is connected to a poppet spring mechanism 18 mounted on the frame 3 and which tends to swing the arm 16 counterclockwise. Latch bar 20, pivoted on frame 3 at 21, hooks over latch pin 22 on the arm 16. A poppet spring 23 attached to frame 3 urges the latch bar down into the latching position of Figure 1.

An arm 24 fixed to detector shaft 6 carries a roller 25 for engaging the latch bar 20 and for lifting the same to bring the stripper mechanism into operation.

If a sheet S is properly registered, the shaft 6 rocks clockwise, dropping arm 24 and roller 25 so that latch bar 20 is not engaged by the roller. -In consequence, the stripper rollers 11 are held away from the cylinder 1 and do not operate.

If, however, a sheet is mis-registered, shaft 6 and arm 24 remain in the position of Figure 1 and as the cylinder rotates roller 25 engages latch bar 20 and lifts it as shown in Figure 2. Meanwhile ejector rods 9 will have lifted the leading edge of the sheet as shown in Figure 2, so that when the grippers 10 close they will not take the sheet. The mechanism by which the movement of detector shaft 6 controls the movement of the plungers 9 is fully shown and described in Patent 2,642,283, above referred to. It comprises a member 6 carried by the detector shaft 6 and positioned when the shaft 6 is in its counterclockwise position (follower roller on the high of cam 8 as shown in Fig. 1) so as to permit movement of the rods 9 by the mechanism shown in Fig. l-A at the appropriate time as determined by a second cam 6 If the cam follower 7 does not drop (as occurs if a sheet is to be rejected) the toe 6 will be in a higher position than that shown in Fig. l-A and will prevent ejection of the rods 9, by blocking movement of toe 6 As soon as the low of the cam 17 comes under the follower arm 16, the arm will rotate counterclockwise to the position shown in Figure 3. This brings the stripper rollers 11 against the sheet and wipes the leading edge of the sheet back on the cylinder, giving it a huckle fold between the rollers 11 and 15, thus removing the sheet from the machine.

What is claimed is:

,1. In a sheet registering mechanism having a register ing cylinder, sheetdetecting and sheet rejecting means, the combination with the cylinder of stripping rollers movaregistered sheet on the cylinder.

2 .2. In a sheet registering mechanism having a registering cylinder, sheet detecting and sheet rejecting means, the:combination with the cylinder of stripping rollers movable into stripping engagement with the outer sur- 7 face of a sheet on the cylinder and actuating means theretor, comprising a spring for urging the rollers toward the cylinder and a cam rotatable with the cylinder for controlling the movement of therollers toward and away :from the cylinder, a latch for holding the rollers away fromthe cylinder and means controlled by the sheet detecting means for releasing the latch to permit the stripping rollers to move into stripping engagement with a misregistered sheet on the cylinder.

3; In a sheet registering mechanism having a registering cylinder, sheet detecting means, and grippers for taking a sheet from the cylinder, the combination with the cylinder of means actuated by the detecting meansfor lifting the leading edge of a sheet to prevent the grippers from gripping it, stripping rollersrnovable into stripping engagement with the outersurface of a sheet on the cylinder, and actuating means therefor controlled by the sheet detecting means for bringing the stripping rollers into stripping engagement when a mis-registered sheet is on the cylinder.

4. In a sheet registering mechanism having a register,- ing cylinder, sheet detecting means, and grippers for taking a sheet from the cylinder, the combination with the cylinder of means actuated by the detecting means for lifting the leading edge of a sheet to prevent the grippers from gripping it, stripping means operable to strip a sheet oil the cylinder, and actuating means for the stripping means actuated by the sheet detecting means when a mis registered sheet is on the cylinder. 1

References Cited in the file of this patent V UNITED STATES PATENTS Huck Feb; 18,

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