SU685904A1 - Device for marking objects to predetermined length - Google Patents

Description

(54) UNIT FOR CUTTING ITEMS

The invention relates to devices for marking objects into segments when they are longitudinally moved, for example, by a conveyor and can be applied to forest logging when cutting logs into assortments. A device for marking objects into segments with their longitudinal movement by a conveyor is known, including photo sensors located along the conveyor and measuring unit 1. The disadvantage of such a device is low: the accuracy of marking, of items into segments, especially those items that have high inertia. The closest in terms of the logical essence of the present invention is a device for marking parts into segments containing an actuator with a reciprocating mechanism with sensors of the actuator position, length sensors associated with the traction control device and after-driving sensors for each length sensor 2. However, this device has a low reliability, since the rundown sensors have photocell. The aim of the invention is to increase reliability in operation. The goal is achieved by the fact that in the proposed device the overrun sensor is made with a pulse generator, a resolution block and a pulse distributor, the pulse generator is connected to one of the inputs of the resolution block, to the other input of which the length sensor outputs are connected, and the output of the resolution block is connected to a relay -Open contact of which is included in the pulse distributor circuit. FIG. 1 conventionally depicts the proposed device; in fig. 2 is an electrical control circuit of the drive mechanism for the longitudinal reciprocating movement of the executive body. The device comprises an actuator 1, in the form of a saw, a mechanism for longitudinal reciprocating movement in the form of a screw pair 2, an actuator for moving the actuator, consisting

of the electric motor 3 and the magnetic starter 4.

In addition, the device contains sensors 5 position of the executive body, sensors 6 lengths, made in the form of photosensors and installed along the conveyor with leading tour 7 and idle turret 8, conveyor electric motor 9, magnetic starter 10, whip speed sensor 11, clamp 12 whip, stop 13 and a stick out sensor consisting of a pulse generator 14, a resolver unit 15, a relay 16 with normally open contacts 17 and a pulse distributor 18 made on the relay Pj -P, with normally open contacts and diodes

The position sensors of the actuator have normally closed contacts B, B. The outputs of all length sensors are associated with an electromagnetic brake (not shown).

The device works as follows.

When the conveyor is turned on and the length of the assortment to be ordered is ordered from the control panel (not shown), the voltage is applied to the pulse distributor 18 and the length sensor 6 is turned on, corresponding to the order. The whip begins to move along with the conveyor belt, and from the generator output 14 pulses, signals are input to the permit unit 15, but there are no signals at its output. When the whip crosses the beam of the length sensor 6, a signal appears at its output, turning on the magnetic starter 10 and arriving at the input of the permitting unit 15, while the electric motor 9 turns off and turns on the electromagnetic conveyor brake and clamping the whip 12, which stops distance (run). At the output of resolution block 15, signals appear in the form of a series of pulses during the entire time of the conveyor run-on. Under the action of these signals, relay 16 repeatedly operates and periodically turns on its normally open contacts 17 in the distributor circuit 18 pulses, since the pulse generator 14 is kinematically connected to the conveyor belt 8, the number of signals at its output is proportional to the path traveled by the transporter. The number of triggers rle 16 is proportional to the amount of stick running. When the normally closed contacts 17 are first closed, the power supply voltage is fed through a circuit to the relay coil P, the latter is activated, self-locking and closes its contacts P in the power supply circuit of the relay coil Bj and in the magnetic actuator circuit 4. The pulse duration of the relay 16 is selected so that by the time the contacts were closed, the P / contacts 17 had time to open. At the second closure of the contacts 17, the voltage goes through the circuit Dl; -1) -D2 contact P to the relay coil P, which operates, blocks itself and closes its contacts in the power supply circuit of the relay and magnetic starter 4. At subsequent Q, the relay 1g operates respectively, the rest of the distributor 18 relays also work, the number of which is selected in accordance with the maximum overrun of the conveyor with a whip 2 by inertia when stopped. When closing the contacts P, P "and so on, in the circuit of the magnetic actuator 4, the latter operates and switches on the electric motor 3, which through the screw pair 2 moves the actuator 1 along the whip. In this case, the stop 13 starts the sequential activation of sensors 5 of the position of the executive body, which moves along the whip until all sensors 5 corresponding to the activated relay of the pulse distributor 18 are open (i.e., the stick out value).

After stopping the actuator and the conveyor from the output of the sensor 11 of the whip speed, a signal is given for pulling in the saw and drank (the mechanical mechanism for pulling the saw is not shown in the drawing). At the end of the cycle, the sawn-up is removed from the distributor of 18 pulses, the executive body and the whip clamp return to their original position, the sawn off assortment goes to sorting. The circuit comes to its original state. With the next order from the control panel, the work cycle is repeated.

Claims (1)

Invention Formula g A device for marking objects into segments containing an actuator with a mechanism for longitudinal reciprocating movement, a stick out sensor, switching on relays with normally open contacts, which are connected to the magnetic actuator of the mechanism of longitudinal reciprocating movement through normally closed contacts of the actuator position sensor, 55 and length sensors associated with a control device of a traction device, characterized in that, in order to increase reliability in operation, the after-run sensor is made with a pulse generator, a permit unit and a pulse distributor, the pulse generator connected to one of the enable block inputs, To the other input of which are connected the output of 65 length sensors, and the output of the permitting unit is connected to a relay, the normally open contact of which is included in the circuit of the pulse distributor. Sources of information taken into account in the examination 1, Attestation  165604, cl. G06 F 15/46, 1; 63. 2, Attestation No. 326438, cl. G01 7/02, 1970 (prototype).