SU682435A1 - Apparatus for separating sheet material from a stack - Google Patents

Description

The magnitude of the slit 20. Parts 10 and 15 of the shutter 9 are interconnected by means of a hinge 21. The relative position of the pieces of the shutter is fixed by a stopper 22.

The vacuum table 3 consists of separate vacuum chambers 23, between which there are gaps 24. The vacuum table chambers are interconnected by a channel 25. The working surface 26 of the chambers is covered with friction material, such as polyetherurethane, 27. The vacuum table moves in the guides 28.

Pusher 4 consists of several parallel plates 29 mounted on a common base 30, guides 31 and a cyclic drive (not shown).

A device for separating sheet material from the foot works as follows.

When feeding relatively thick sheet material, a stack of sheet material 8 is loaded into the magazine, the lower part 10 of the trimmer 9 is installed at the required angle to the working surface 26 of the vacuum table 3 by rotating the part 10 in the hinge 21 and fixing it with a stopper 22. The angle value is determined depending on behavioral and frictional properties of sheet material. Install the screw-stop 19 the size of the slit 20, depending on the thickness of the feed material. At the beginning of the cycle, the pusher 4 is lowered, its plates 29 go into the gaps 24 of the vacuum table. The bottom sheet 32 of the foot 8 is lowered onto the working surface of the vacuum table and is attracted to it by the force of vacuum, which is somewhat straightened.

When moving the vacuum table from right to left, the bottom sheet of the moans, carried along by the working surface of the vacuum table, is shifted to the left, the front edge entrance to the exit slit 20, finally straightened due to the inclined position of the bottom part 10 of the shutter 9. The overlying sheets of the lower part of the foot are also shifted to the left for the strength of friction between nil1I. At the same time, part 10 of the cutter 9 is not only a rectifying means of the behavioral sheets when they enter the slot 20, also along the cascifier of the front edges of the sheets of the lower part of the foot. As a result, the upper plane of the leading edge of the lead-through sheet 33 is torn off, which, interacting with the friction plate 11, remains in the magazine.

As the lower sheet of the plate 29 is withdrawn, the pusher 4 rises and reaches the level of the working surface 26 of the vacuum table at the moment when the lower sheet is completely out of the store. The foot 8 rests on a new bottom sheet on the upper ends of the plates 29 of the pusher 4 and with continued

lifting the pusher is raised above the working surface.

After the meeting of the upper ends of the plates 29 with the part 10, the latter rises, compressing the spring 17 due to the possibility of the movement of the shutter in the guides 16.

The vacuum table with the vacuum turned off goes back under the foot, moving from left to right. The pusher descends to the level of the table, a vacuum is turned on, a new bottom sheet of the foot, distributed, lies on the working surface of the table. The cutter 9 is lowered to the lower position defined by the stop screw 19. The pusher 4 is lowered below the level of the working surface of the vacuum table. Further, the cycle of operation of the device is repeated.

A piece of paper is fed in a similar way from the device, however, the stop screw 19 is released, the friction plate is pressed against the working surface 26 of the vacuum table 3 by a spring 17. The spring compressive force is adjusted by a screw 18. When the vacuum table moves from right to left, the bottom sheet of the foot paper is entrained by the work surface 26 of table 3 and is removed from the store. The cutter 9 is then lifted by the thickness of a sheet of paper, compressing the spring 17, and the friction plate 11, which interacts with the open upper part of the edge of the advance sheet of paper, cuts it off from the rest of the foot.

Due to the spring 17, the cutter 9, when withdrawing both a relatively thick sheet material and a thin one, can slightly lift, compensating for the technological unevenness of the working surface 26 of the vacuum table 3.

The proposed device improves reliability of operation and expands technological capabilities, i.e., it allows the use of a printing machine equipped with the described device for working with both thick and thin sheet material.

Claims (2)

1. A device for separating sheet material from the foot, comprising a magazine, a means for moving the bottom sheet mounted under the magazine and spring loaded slammers mounted in the front walls of the magazine, having adjusting means and friction plates for interacting with the separable sheets, characterized in that in order to increase the reliability of the device and expand its technological capabilities, each shutoff device consists of two parts hinged between each other, one of which is located The wife is in the guides of the front wall of the magazine, and the other carries a friction plate and has a stopper for fixing the relative position of the parts of the cutter and a screw for adjusting the degree of compression of the spring. 2. The device according to claim 1, characterized in that the means for moving the bottom sheet is made in the form of vacuum chambers, the working surface of which is covered with friction material. Sources of information taken into account in the examination 1. UK patent number 1099601, cl. In 6B, 1968 (prototype). CgW .one g V / L WAV / A U / L / Al 24 N 23 gz thirty |. ZG Figure 2 fuz. 3