DE185622C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- JV! 185622 - CLASS 42 a. GROUP

ALEXANDER FEDÜKIN in ST. PETERSBURG.

Pantograph, whose positive image transfer turns into a rigid two-armed lever coupled rotating arms for the purpose of transferring a mirror image are released from each other and a cord run

receive counter-rotating movement.

Patented in the German Empire on February 22, 1905.

The subject of the present invention is a pantograph with which not only enlargements and reductions of plans, drawings etc. in any way Scale can be made, but also both positive and inverse Images' d. H. Mirror images made using the same device can be.

ίο Devices are already known, but their area of application is limited, since they can be used either as a pantograph or as a mirror image drawing device, not for both are; these have two arms which can be rotated with their end points about two fixed axes and on each of which there is a slide for the driving pen and the drawing pen slides through a cord passed over pulleys are interdependent in their movement, while those for the production of Mirror images required dependence of the rotation of the arms through, concentric . with the axes of rotation of the same attached, intermeshing gears is achieved.

In contrast, according to the present invention, the opposite movement of the rotatable Arms for the purpose of producing a mirror image achieved in that the arms each rotatable about a common pin a line roller are provided with two more, on one on the same pin attached cross pieces arranged rollers are connected by cords that the rotation of one arm in one sense, that of the other in the reverse Corresponds to the senses. If no mirror images are to be produced, the both arms can be connected to one another in a slightly rigid manner by means of a clamping screw.

A pantograph of this type is shown by way of example in the accompanying drawings and shown schematically, namely show

two Fig. 1 the same in view and two Fig. 2 the same in cross section, while Figure 3 shows the crosspiece of the apparatus holding the transfer rollers, namely the solid lines represent the side view and the dashed lines the top view of the grain.

Fig. 4 shows a schematic representation of the positive image apparatus and
Fig. 5 for negative images while
Figure 6 illustrates a variant of the negative image apparatus which is advantageously used with very large drawings or the like.

The pantograph consists of two hollow joint-like toggle levers, which in turn consist of the arms a _x a ' and a. ₂ a "are composed, the length of which is selected in the given ratio.

The arms a _x and a ₂ each rotate freely around the common axis 0 and can

Claims (1)

ζ. B. be determined by means of nut s to each other that they form a straight line, the rotation around ο is retained. Since the arm ä " is firmly connected to the roller e and the arm α ' to the roller d and the rollers e and d are in turn connected to one another by means of a sufficiently tensioned cord η, it follows that when the • leading pin c causes a corresponding angular movement of the tracing pin b ., The arm α ' around the axis O ₁ and the arm α ″ around the axis O ₂ turns. '; Here are the inner arms a _x and a. ₂ determined in a straight line by means of the screw nut s , a positive image is created, but on a correspondingly changed scale according to the scheme of FIG. 4. If, on the other hand, reversed, ie mirror images, are to be drawn with the device, the two inner arms Ci ₁ and a ₂ are made freely movable about the axis 0 by loosening the screw s. By attaching the cross piece t provided with the two rollers X ₁ and X ₂ , it is made possible that the angular movement of one arm corresponds to the same angular movement of the other in the given ratio in the opposite direction, namely in the opposite direction. ^{;: it} seems like this: The crosspiece ί is attached to the axis 0 below the roller q. On both of them The ends of the same are _{attached the rollers X 1} and x ₂ , which have the same diameter as the rollers ρ and q (see Fig. 3). The arm a _x rotates around the axis 0 and is' firmly connected to the role ρ. The arm a ₂ , which also rotates about the axis ο, is provided with a downwardly moving nose g sliding in an annular slot of the roller ρ , to which the rollers are fastened with the aid of the screws f , so that when the Roll ρ an angular movement of the arm ^ ₁ and with a rotation of the roller q an angular movement of the arm a ₂ takes place. Two wires u and n> have the necessary friction span; Tensioned between the individual roles as follows: The wire μ first runs around the roll p, from there crossing around the roll X ₁ , crossing back again around the roll p, then around the roll x '. _z ends smoothly at ρ again. Its course is shown by arrows with the designations ΐ _ρ , 2 _F , etc. in FIG. The wire n> is stretched around the rollers and has its crossing between the roller x ₂ , so it only makes the same path in the opposite direction. This ensures that when the arm a _l connected to the roller ρ is rotated to the right with the aid of the wire u, the roller X ₁ rotates to the left and the roller x ₂ rotates to the right. However, the wire w also goes around the rollers X ₁ and x ₂ , which in turn allows the roller q and thus the arm a ₂ to rotate to the left so that the arms move according to the diagram in FIG. The movement of the outer arms a ' and a " takes place in this arrangement with the crossing of the wire η over the disks d and e. The recording of negative images can also be done with the apparatus according to the scheme of FIG. 6 take place. In this arrangement, the cross piece t with the rollers X ₁ and x _{2 is} completely omitted, and the inner arms Ci ₁ and a ₂ with the rollers ρ respectively. _q each rotate about a special axis 0 and are connected by a cross-tensioned wire, so that an angular movement of the arm a _{x is} transmitted in the opposite direction to the arm a _2. However, with this arrangement, which is conveniently used when enlarging or reducing very large plans or drawings, it is not possible to reproduce positive images with the same apparatus. A wire m serves to raise and lower the drawing pen b from the guided pen c , which runs around the roller r and connects the small levers k and / with the intermediary of the rollers J ₁ and J _2. When setting up the pantograph, two right-angled, similar triangles o, y, g and o, \, h are first laid out on a straight line, for positive images according to Fig. 4, for negative ones according to Fig. 5. The sides ο ^, \ h and oy, yg must correspond to the arms of the apparatus, which are adjusted to the desired extent from the original to the image to be reproduced. The apparatus is now set up according to the drawing so that its axes O ₁ , 0 and O ₂ lie exactly in points y, o and ^, while the driving pen c and the drawing pen b must coincide with the points g and h . When all center and end points of the pantograph exactly match the angles of the triangles, the pantograph is ready to work. The foot ν must be heavy enough so that it remains completely immobile during work. Godfather nt-A ν saying: Pantograph, desseü with positive image transfer to a rigid double ■ armed lever coupled rotating arms for the purpose of transmission of a mirror image are disengaged from each other, and receive an opposite rotary movement by means of cord drive, characterized in that the rotatable arms about a common pivot (o) or to two pivots (O, O ₀₎ (a _x, a ₂ ) are each connected to a line pulley (p, q), which are rotated in opposite directions by a crossed cord drive (ii, n>) with the mediation of intermediate rolls (χ _λ , χ. ₂ ) arranged on a crosspiece (t) attached to the pivot is granted, the change in the mode of transfer of the image by releasing BEZW. Tightening a clamping screw (s) can be effected. 1 sheet of drawings.