SU115718A1 - Photocopier for milling of plaster patterns - Google Patents

Description

Photocopiers with a photocopier tracking system that automatically reproduces a closed loop are known. In these machines, the cutting tool is fixed on the support of the transverse trunk, which moves in two carriages. Such a design for fastening the cutting tool is difficult to operate and does not provide the necessary accuracy.

In the described machine, these deficiencies are eliminated by the fact that the cutting tool is mounted on a three-wheeled cart, the movement of which occurs by driving the front wheel, and the uptake - by moving the cart from the tracking photovoltaic system.

FIG. 1 shows a machine in section along AA-BB. FIG. 2; in fig. 2 is the same machine in the plan; in fig. 3 shows a section along the explosive in FIG. 2; in fig. 4-scheme of electric trolley motion control.

The machine is a three-wheeled cart, on which are placed: a drive driving the cart, a drive telling the turn of the cart through the front drive wheel, a compensating device, a photovoltaic system, and a cutting tool.

The trolley drive consists of an electric motor / worm gear 2, a vertical shaft 3, a gear 4, an intermediate shaft 5, a worm gear 6 and an axis 7 of the front wheel 8.

The trolley (front wheel) rotation drive consists of two engines 9 and 0, rotating in opposite directions, a differential 11, a horizontal shaft 12 with a gear coupling 13, a worm gear 14 and a fork, 75. Of the front wheel 8.

The motor 10 transmits the movement through the differential to a compensating device consisting of a reduction gear 16, a transverse screw 17 and a carriage 18, on the horizontal bars 19 of which the photovoltaic system 20 and the cutting tool 21 (milling cutter) are reinforced.

No. 115718-2 -

The front wheel 8 is driven, and the two rear wheels 22 are free-rotating.

The reproduction of the curve plotted on the plaza is accomplished by automatically controlling the rotation of the driving front wheel 8 of the dolly, depending on the response of the photographic camera. The photographic head is pa- sponced on the same vertical axis, passing through a point formed from the intersection of the middle longitudinal axis of the carriage and the axis of the rear wheels.

Thus, the onHCHBaroT milling cutter and photo head in planes parallel to pattern 23 have the same trajectory. The plasma is illuminated by an electric bulb 24. Rays of light are reflected from the plaza in all directions. Only those that are perpendicularly reflected from the plaza surface pass through the rectangular window 23 of the photographic head. Then the distant rays pass through anamorphic lens 2, which changes the cross section of the rays from .1 mm X 0.1 mm to 1 mm X 1 mm.

The rays themselves pass through the diffusing lens 27 to the photocell 28. Depending on the position of the photo head relative to the plaza line, there can be three basic positions:

a) rays are reflected only from the plaza line;

b) the rays are reflected only from the clean surface of the plaza;

c) the rays are reflected both from the plaza line and from the clean surface of the plaza.

Due to different reflective abilities of the body and viniprosis (or paint, which is painted metallic plazas) in version a, the photocell illumination is the smallest, in version b it is the greatest, and in version b it is like / average lightness.

As the main working position, the variant in with medium illumination is taken (see, top of the drawing and part I, IV and VII). In this case, the left, edge of the curve in the feed direction is the working edge. The photo head reacts when moving only through the working edge. At the main working position of the photo viewer (option c), the photocurrent of the photocell has an average value. The photocurrent is amplified by a thyratron 29, the anodic circuit of which feeds the excitation winding 30 of the rotation engine 9.

The turning motor 9 has two excitation windings 30 and 31 which create oppositely directed magnetic fluxes. The winding 30 is powered by the thyratron 29, and the winding 31 directly from the AC mains through the selenium rectifier 32 and the rheostat 33.

The current flowing through the field winding 31 coincides in. Phase with anode current of the thyratron. Its value is regulated by a rheostat 33.

With such an adjustment, in the main operating position of the photographic camera, the resulting excitation magnetic flux is zero and the turning engine 9 does not work.

When the photo-head disappears from the plaza line (P and VI positions), the thyratron current feeding the excitation winding 30 is larger in magnitude than the excitation current in the winding 31.

The resulting magnetic flux in absolute value is equal to the difference of the magnetic fluxes of the windings 30 and 31, and in the direction coincides with the magnetic flux of the winding 30. At the same time, the turning engine 9 starts to work and turns the steering wheel clockwise and the cart moves to the plaza line. When the photo-camera head enters the plaza line (position III and V), the anode current of the thyratron 29 (casting the excitation winding 30) is smaller in magnitude than the excitation current in the winding 31.

The resulting magnetic flux in its magnitude is equal to the difference in magnetic fluxes of the windings 30 and 31, and coincides in direction with the magnetic flux of the winding 31. At the same time, motor 9 starts to work and turn the steering wheel counterclockwise and the cart moves away from the line.

The machine goes around the curve from left to right.

This is due to the fact that the milling is performed by an angular milling cutter and the right edge, which is necessary in the pattern, is obtained from the right side in the direction of the feed.

Therefore, turning the steering wheel to the right (clockwise) gives the movement of the trolley with the cutter always to the plaza line, and turning to the left (counterclockwise) always gives the movement of the trolley from the plaza line.

This two turn drive motor control system provides control flexibility. With a slight deviation of the window 25 of the photo from the working edge of the plaza line, the turning engine 9 starts to work and eliminates this deviation.

The rectangular window 25, when operating, will always refer to the curve of the plaza line.

However, by simply turning the front wheel, the deviation of the photographic device from the line on the plaza cannot be corrected, since this requires the movement of the carriage in the feed direction, which takes a certain amount of time. This work is performed by a compensating device.

When the machine is in operation, the compensating movement of the carriage 18 from the transverse screw 17 occurs together with the photo-head and the cutting tool (milling cutter). At that, their movement relative to the trolley body occurs perpendicular to its longitudinal axis, i.e. perpendicular to the contour of the lipid plasma curve.

When the front wheel 8 rotates clockwise, the movement of the photo head together with the cutter will be on the plaza line, and when the wheel 8 is turned counterclockwise, away from the line of the plaza, e. In the direction, the compensating movements of the photo head together with the cutter coincide with the main movements mi carts during operation, which makes the photocopier system of the machine more sensitive.

A photocopier for milling flat patterns with a photocopier tracking system that automatically reproduces a closed loop, characterized in that the cutting tool is mounted on a three-wheeled cart, which is moved by driving the front wheel and controlling the direction of motion of the cart from the next photoelectric system.

No. 115718

Subject invention