JPH03200636A - Sheet feed device for print- ing of sheet matlhing machine - Google Patents

Abstract

PURPOSE: To improve efficiency and reliability by controlling revolving speed of a grip mechanism so as to be located at a second revolving speed location for releasing a sheet in a standstill state on a discharge place or so as to be moved at remarkably low speed. CONSTITUTION: A grip mechanism 7 is constituted of a rotatable lower grasping pawl 8 on a shaft 9 along a discharge drum 2 by a control cam 10 and a cam roller 11 traveling on the cam 10 and an upper grasping pawl 12 revolvable in opening and closing directions by an operation mechanism by a control cam 14 and a control roller 15 on a rotary shaft 13 mounted on the grasping pawl 8. Since the discharge drum 2 moves at fixed angular speed and discharges a sheet 1 to a receiving base 4, the lower grasping pawl 8 is oppositely moved by the cam roller 11 and the grip mechanism 7 becomes a standstill state for the receiving base 4 for a moment. The upper grasping pawl 12 is opened and is moved to the receiving base 4 at the time of slowest speed. Therefore, the rear part of the sheet 1 is surely caught by an entraining device 5 and high speed revolution becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention comprises a discharge cylinder between the printed sheet storage and the cradle of the collection conveyor, and also provides a means for discharging the printed sheets fed from the printed sheet pile. for grasping the printed sheet in a first rotational angular position of the delivery cylinder and for releasing the printed sheet in a second rotational angular position abutting a receptacle from which the printed sheet is conveyed by an entrainer of the collection conveyor; The present invention relates to a paper feeding device for printed sheets in a collating machine equipped with a gripping mechanism for a discharge cylinder.

[Prior Art] In this type of collating machine, printed sheets are grasped rear-first by a gripping mechanism of a delivery cylinder and dropped onto a receiving tray. The release movement is effected by opening the gripping mechanism at a predetermined angle of rotation of the delivery cylinder in front of the actual receiving location, so that the printed sheets are fed parabolically into the receiving tray.

[Problem to be Solved by the Invention] The parabola is highly dependent on the circumferential speed of the discharge cylinder, so that on the one hand the printed sheets pass spine-first through the entrainer of the collection conveyor at low circumferential speeds; On the other hand, at high ambient speeds, the parabola flattens out and the printed sheet hits the rear stop of the cradle and bounces irregularly, so that it falls into the cradle. There is a risk that position-accurate ejection of the printed sheets is no longer possible and that the printed sheets are not able to come to rest before the impact of the entrainer of the collection conveyor.

At high speeds, a prerequisite for accelerating the printed sheets perpendicular to the direction of ejecting movement is that the printed sheets are located in the exact position of the cradle before they are received by the entrainer of the collection conveyor. It should be placed flat on the ground and no action should be taken when accelerating.

Practical experience has shown that a free-falling motion poses great problems when discharging printed sheets onto a pedestal with a high number of cycles, especially when dispensing individual sheets.

Paper feed devices for collating machines that are equipped with so-called stationary grippers for the purpose of increasing efficiency belong to the prior art. A T-folder for printing sheets constructed in this way is known from German Patent Publication no. It is equipped with a discharging device that dumps the paper onto a collection conveyor. In this case, a cylinder with grippers is provided between two cylinder plates, which in the stationary state carry out a non-uniform rotary movement by means of a transmission in order to carry the cylinder that grips the sheet. Next, the torso
After a rotation of approximately 180'', it is accelerated to twice the rotational speed of the two barrel plates, at which point the grippers are released and the printing sheet is freed and dropped.

Furthermore, German Patent Publication No. 303549
A feeding device for printed sheets is known from No. 8, which device comprises a delivery cylinder below a printed sheet storage and also feeds the printed sheets folded downwards from the storage. A gripping mechanism is provided on the delivery cylinder for grasping in a first rotational angular position and releasing the printed sheet onto the receiving surface in a second rotational angular position of the delivery cylinder.

In order to increase efficiency, it is provided in this case that the lower part of the gripping mechanism is mounted movably in the direction of rotation of the discharge cylinder between a preceding end position and a subsequent end position on the cylinder. At the point when the upper gripper abuts the lower gripper, the lower gripper is moved from the leading end position to the trailing end position, and the upper gripper follows until the movement of the lower gripper is released by the action of a force. The printed sheet is thus grasped at the point in time when the gripping mechanism moves at a rotational speed that is slow compared to the rotational speed of the delivery cylinder. After picking up the printed sheet, the speed of the delivery cylinder is gradually increased and the printed sheet is then dropped.

The object of the invention is to significantly increase the efficiency and reliability of operation of a T-fitting machine of the type described above.

[Means for solving the problem] This problem is achieved according to the invention by providing a second gripping mechanism for releasing the printed sheet in a stationary state above the ejecting location.
The invention is solved by making it possible to control the rotational speed of the gripper mechanism such that it is at a rotational angular position of , or moves at a speed significantly lower than the rotational speed over the release location.

In a particularly preferred embodiment, provision is made for the gripper mechanism to be pivotable in a direction opposite to the direction of rotation of the ejector cylinder, such that the counter-swivel movement compensates for the rotational movement of the ejector cylinder.

Further features of the invention are apparent from the other dependent claims.

The invention provides that the ejection of the printed sheets takes place when the gripping mechanism is stationary or at least when the rotational speed is significantly reduced;
Therefore, when a precise ejection of the printed sheet position on the receiver and a transition of the printed sheet to a stationary state before reception by the entrainer of the collecting conveyor is achieved, this type of collating machine It is based on the recognition that efficiency and operational reliability can be significantly increased.

The feeder according to the invention completely eliminates the free falling movement of the printed sheets, prevents the printed sheets from returning to the back stop of the pedestal, and prevents them from accidentally entering the entrainer shaft of the collection conveyor. slumps are eliminated. The printed sheet is brought into a precise and stable ejection position, which is a prerequisite for the immediate acceleration of the printed sheet.

[Example] Next, an example of the present invention will be described in more detail with reference to one drawing.

The paper feeder according to the invention for feeding printed sheets l to a collating machine has a delivery cylinder 2 between a printed sheet storage 3 and a receiver 4. The cradle 4 has a longitudinal hole 4a in which an entrainer 5 of the collection conveyor 6 moves in order to remove the printed sheets 1 discharged onto the cradle 4.

Two controllable gripping mechanisms 7 are provided oppositely on the delivery cylinder 2, one of which grips the printed sheet in a first rotational angular position and the other gripping mechanism 7 simultaneously grasps the printed sheet in a first angular position. The printed sheet is ejected in two rotational angular positions.

The gripping mechanism 7 is attached to a lower gripping pawl 8 rotatable around a shaft 9 along the discharge cylinder 2 and a lower gripping pawl 8 by a control mechanism consisting of a control cam lO and a cam roller 11 running on the control cam lO. It consists of an upper gripper 12 located on the rotation axis I3 and pivotable in the opening and closing direction by an operating mechanism consisting of a control cam 14 and a control roller 15 running on the upper gripper.

The discharge cylinder 2 moves in the direction of the arrow at a constant angular velocity.

In order to eject the printed sheet l onto the receiver 4, a reverse movement of the lower gripper 8 is performed by means of the cam roller 11, so that for an instant a standstill of the gripper mechanism 7 relative to the receiver 4 is reached. In that case, the upper gripper 12 opens,
The printed sheet is transferred to the cradle when the fall height is at its lowest.

In order to ensure that the rear part of the printed sheet 1 discharged into the receiver 4 is gripped by the entrainer 5, the entrainer 5 extends as far as a notch 16 on the periphery of the delivery cylinder 2, so that the angular position of the notch 16 is timed to the operation of the entrainer 5.

Prevents printing sheets from flying up due to the lifting force of airflow,
Guide plates 17, which correspond to guide elements whose purpose is to prevent the lifting of the attitude during acceleration after being received by the entrainer 5, are provided at regular intervals above the cradle 4. Furthermore, the guide plate 17 ensures a secure reception of the printed sheet 1.

The cradle 4 is delimited in the direction of movement of the printing sheet 1 on the one hand by a back stop 19 and on the other hand by a front guide 18 which is adjustable to the size of the respective printing form and is therefore limited in the direction of movement of printing sheets 1. Collection conveyor 6
Inclined retraction due to the action of off-center forces on the entrainer 5 can be eliminated.

According to the invention, the rotational movement of the delivery cylinder 2 is compensated for by the counterswivel movement of the gripper mechanism 7, so that the position of the printed sheet 1 on the cradle 4 can be accurately ejected and the entrainer 5 can prevent it from resting. acceleration is guaranteed.

It is obvious that the present invention is not limited to the embodiments described above, but can be modified. It is therefore also possible to control the gripper mechanism 7 in such a way that it moves at a considerably lower speed compared to the rotational speed in order to eject the printed sheet 1.

4,

[Brief explanation of drawings]

The figure is a side view showing one embodiment of the present invention. l...Printing sheet, 2...Discharge cylinder, 3...
-...Storage container, 4...Case, 4a...
・・・Vertical hole, 5... Entrainer, 6...
Collection conveyor, 7...Gripper mechanism, 8...Lower gripper, 9...Axle,! 0...Control cam,
11...Cam roller, 12...Upper grip, 13...Rotating shaft, 14...Control cam, 15...Control roller, 16...Notch, I7... ...Guide plate, 18...Front guide, 19...Rear stopper.

Claims (1)

[Claims] 1. A discharge cylinder is provided between the printed sheet storage device and the receiver of the collection conveyor, and the printed sheets supplied from the printed sheet pile are transferred to the first of the discharge cylinders. a gripping mechanism of the delivery cylinder for grasping in a rotational angular position of and releasing the printed sheet in a second rotational angular position abutting a cradle from which the printed sheet is conveyed by an entrainer of the collection conveyor; In the feeding device for printed sheets in a collating machine, the gripper mechanism (7) is in a second rotational angular position for releasing the printed sheets (1) in a stationary state above the ejection location. , or a feeding device for printed sheets in a collating machine, characterized in that the rotational speed of the gripper mechanism (7) can be controlled such that it moves at a speed significantly lower than the rotational speed over the discharge location. 2. The paper feeding device according to claim 1, wherein the gripping mechanism (7) is rotatable in a direction opposite to the rotation direction of the discharge cylinder (2) so that the reverse rotation movement compensates for the rotational movement of the discharge cylinder (2). . 3. A lower gripper (8) rotatably supported on the discharge cylinder (2), an upper gripper (12) supported rotatably in the opening/closing direction via an operating mechanism, and rotation of the discharge cylinder. direction and the opposite direction to the lower gripper (8
). Claim 1 or 2, further comprising a control mechanism for moving the
Paper feed device as described. 4. A paper feeding device according to any one of claims 1 to 3, further comprising guide elements arranged at regular intervals on the pedestal (4). 5. The entrainer (5) of the collection conveyor (6) is the discharge cylinder (2)
extending into a notch (16) in the periphery of the
5. Paper feeding device according to claim 1, wherein the rotational angular position of the notch (16) is timed to the movement of the entrainer (5).