RU1791159C - Device for cutting polygraphic products - Google Patents

Abstract

SUMMARY OF THE INVENTION: the device comprises a conveyor mounted on the base with grippers on the path of which a knife is mounted, a guiding counter-knife with a figured groove for the knife and a knife drive with a balancer, the mass of which is equal to the mass of the knife, including two cranks, two connecting rod and flywheel. One of the faces of the cutting edge of the knife is aligned with the cutting plane, and the cutting edge is at an acute angle to the direction of movement of the jaws. The balancer knives are mounted on the base each by means of a pair of equal-sized and parallel to each other rocker arms located in their middle position at an angle of 90 °; to the line of the cutting edge of the knife. Each rocker arm is located in its mid-position at an angle of 90 ° to the line of the cutting edge of the knife and made in the form of a set of elastic parallel plates located with a gap to one another and having a hard seal in the base of the device and, accordingly, in the knife and the balancer. 2 ill. ate with

Description

The invention relates to the printing industry and can be used in bookbinding

  production, in particular for cutting graphic products.

A device for cutting printing products is known, which comprises a conveyor with product clamps, a knife installed on the product transfer path, the cutting edge of which is placed at an acute angle to the direction of product movement, and one of the faces forming its cutting iron edge is aligned with the plane cutting, vibro-drive of a knife with a balancer, the mass of which is equal to the mass of the knife, two cranks mounted diametrically on the shaft

opposite to each other, two connecting rods, by means of which the knife and the balancer are connected to each with a corresponding crank, the flywheel in the knife drive and the guide-counter-knife with a figured groove into which the knife enters, while the knife and the balancer are mounted on the base, each separately - by means of a pair of rockers, which, in their middle position, are parallel to each other and are located at an angle of 90 ° to the line of the cutting edge of the knife. This device is selected as a prototype. In this device, the rocker arms, by means of which the knife and balancer are mounted, are made in the form of rigid levers, which have an articulated connection with the base, and, accordingly, with the knife and the balancer.

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Joint venture

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The classic yoke design used in the yrwt device to provide the required stiffness of the levers requires the use of levers with a substantial mass. The articulation of 5 levers with a base, knife and balancer requires the use of bearing units with a lubrication system, which also increases the moving mass of the device.

The device’s movable weight limits the 10 allowable tea vibration of the knife and the balancer, thereby limiting the speed

cutting / Availability of bearing units, in addition, is associated with clearances in the connection (backlash), which is reflected in the long-term

device

The purpose of the invention is to reduce the moving mass of the device and increase the cutting speed and durability of the device.

This is achieved by the fact that in a device for cutting printing products containing a conveyor with grippers for clamping products, a knife is installed on the product transfer path, the cutting edge 25 of which is placed at an acute angle to the direction of the product of transfer, and one of the faces forming its cutting edge combined with the cutting plane, the knife’s vibrodrive with a balancer, 30 the mass of which is equal to the mass of the knife, contains two cranks mounted diametrically opposite to each other on the drive shaft. Two connecting rods, by means of which a knife and a balancer, each connected 35 with a corresponding crank, and a flywheel, as well as a guide, are a countercutter with a figured groove in which the knife enters, while the knife and the balancer are mounted on the base, each separately, by means of - 40 vom pairs of rockers, which, in their middle position are parallel, between

 themselves and are located at an angle of 90 ° to the line of the cutting edge of the knife, each of the rockers, by means of which the knife and the balancer are mounted on the 45th base, are made in the form of a set of elastic parallel plates located at some distance from each other, and having a hard seal in the base devices and, accordingly, 50 in the knife and balancer.

In FIG. 1 is a schematic kinematic diagram of an apparatus for cutting printing products; ya FIG. 2 - constructive design of the knots for closing the ends of the set of plates at the base of the device and IN THE KNIFE ... ,, .., -....-: .-, ..-: -.,;. ;

VcTpoVtdfto for cutting printed products contains a conveyor with grippers for clamping products (see Fig. 1). knife

2 mounted on the base 3 by means of sets of elastic parallel plates 4 and 5, a balancer b, the mass of which is equal to the mass of the knife and a vibratory drive of the knife and the balancer, including the drive shaft 7, cranks 8 and 9, installed diametrically opposite on the drive shaft 7 and two connecting rods 10 and 11, by means of which the knife and the balancer are connected with the corresponding cranks 8 and 9. The balancer b is mounted on the base 3 by means of sets of elastic parallel plates 12 and 13. One end of each set of plates 4,5,12, 13 is rigidly embedded in the base 3 and secondly end of each of a set of plates respectively rigidly clamped in the knife 2 and the rocker b ..

In the middle position of the knife and the balancer, all sets of plates are parallel to each other and are located at an angle of 90 ° to the line of the cutting edge 12 of the knife 2. The cutting edge 14 of the knife 2 is located at a certain acute angle o, with respect to the direction (arrow A) of the movement of the product 15, and one of the faces that form this cutting edge 14 is aligned with the cutting plane. The movement of the drive shaft 7 is transmitted from the electric motor 16 by means of a V-belt drive 17. To smooth out the peak loads in the knife drive and the balancer, the flywheel 18 is mounted on the drive shaft 7. In addition, the device contains a guide-cutter 10 used as a support for the cut product, B the counter-guide 19 has a figured groove into which the knife 2 fits, which is necessary for reliable cutting of the product.

Each of the sets of plates consists of several flat elastic plates 20 (see Fig. 2), separated by gaskets 21 and 22.

The sealing of the set of plates in the base 3 is carried out using the brackets 23.24 and the bolts 25, and with the knife or the beam using the brackets 26 and 27 and the bolts 28.

A device for cutting printing products operates as follows.

Clamped on the gripper 1 of the conveyor belt, the product 15 (for example, a book block) moves at a constant speed and, when it moves, it hits a constantly vibrating knife 2. At the same time, the product is cut with a knife 2 by sawing sheets, since the knife2 practically vibrates along it the cutting edge 14. and the cutting chrome 14 of the knife 2 is located at a certain acute angle (in the current installation, depending on the block thickness from 2 to 5 °) with respect to

direction of product movement. Vibrate knife 2 along its cutting edge

provided by that; that the length of the free (not sealed) part of the sets of plates 4, 5

much longer crank length 8 selected.

For example, in the current installation of etidlin, with 125 mm and 2.5 mm, respectively, which ensures the knife's arrow for direct movement of only 0.02 mm, i.e. value that can be neglected. Another condition for ensuring the straightness of the knife movement is that the sets of plates 4, 5 in the middle position of the knife are at an angle of 90 to the cutting edge 14 of the knife 2.

The movement of the knife 2 and the balancer 6 is transmitted from the electric motor 16 through the V-belt drive 17, the drive shaft 7, the cranks 8, 9 and the connecting rods 10.11.

The fastening of the knife 2 and the balancer 6 to the sets of plates 4, 5, 12, 13 is carried out, for example, in the current installation, using duralumin brackets, while the movable mass of one rocker arm with a bearing assembly in the prototype and the movable mass of one set of plates with brackets in the proposed technical solution, respectively, equal to 2,907

kg and 2.075 kg. That is, the moving mass in the proposed technical solution is reduced in total compared to the prototype by 3.328 kg, which is 17% of the total moving mass of the prototype (20 kg).

Reducing the movable mass of the device can increase the frequency of vibration of the knife and, ultimately, increase the cutting speed.

The backlash-free joints of the knife and the balancer with the sets of plates can increase the durability of the device.

During operation of the device, the elastic plates included in the sets of plates experience complex bending. The arrangement of the plates at a certain distance from each other, achieved by means of gaskets 21, 22, eliminates the friction of the plates against each other, which also helps to increase the durability of the device. Dynamic loads arising during the reciprocating motion of the knife are damped by counter dynamic loads with side of the balancer, working in antiphase with a knife, which eliminates the occurrence of vibration in the device.

When cutting the product 15, it is supported by the guide blade 19.

excluding the possibility of bending the sheets from the component cutting force. This, together with the entry of the knife 2 into the figured groove of the guide-knife, provides reliable cutting of the product.

Claims (1)

The invention is a device for cutting printing products containing mounted on the base of the conveyor with grippers for clamping of workpieces installed on the path of moving the grippers a knife, the cutting edge of which is formed by two faces and placed at an acute angle to the direction of movement of the grippers, one of the faces aligned with the cutting plane, the guiding counter-knife with a curly groove into which the knife enters and a knife vibrator with a balancer, the mass of which is equal to the mass of the knife, including two cranks mounted on the drive shaft diametrically opposite to each other, two connecting rods, through which the knife and the balancer are each connected to the corresponding crank, and a flywheel, with the knife and the balancer are each mounted on the base by means of a pair of equal-sized and parallel to each other rockers located in their middle position at an angle of 90 ° to the line of the cutting edge of the knife, characterized in that, in order to reduce the moving mass of the device, increase the cutting speed and durability of the device , each of the rocker arms is made in the form of a set of elastic parallel plates located with a gap to one another and having a hard seal in the knowledge of the device and, accordingly, in the knife and the balancer.