Patent GB-665748-A (GB)
Title: Improvements in or relating to recording apparatus
IPC: G01D9/40
Filed: 1949-02-07
Abstract: 665,748. Recording-apparatus. REASON, R. E., and KAPELLA, Ltd. Feb. 2, 1950 [Feb. 7, 1949], No. 3329/49. Class 106 (iv). Recording-apparatus comprising a pen unit whose pen oscillates in accordance with one variable and a flexible chart moved through a guide in accordance with a second variable is characterized in that the guide ,comprises two mutually separable elements, one associated with a base portion whilst the second element and the pen unit are together movable toward and away from the base portion and first element. The apparatus is housed in a base A, Fig. 2, and lid B hinged by lugs A<SP>1</SP> and pin B<SP>1</SP> which may form a handle. An electric clock motor C, Fig. 6, is mounted at the other end of the base and drives through reduction gearing C<SP>1</SP> a friction feed roller against which an idler roller mounted in the lid is urged by springs in vertical recesses in the lid. A supply roll F<SP>1</SP>, Fig. 4, and guide roller E<SP>4</SP> are mounted on triangular plates E which with spacer bars form a frame pivoted at E<SP>2</SP> to a bracket secured to a cover-plate A<SP>2</SP> which closes the base A and has openings accommodating the friction feed roller and pivoted frame. Trunnions F<SP>3</SP> of a spindle F<SP>2</SP> carrying the roll F<SP>1</SP> are accommodated in bayonet slots E<SP>5</SP> in the plates E and are held therein by locking studs E<SP>7</SP> on spring stops E<SP>6</SP> fixed to the plates E and held inwards by adjacent side-plates fixed to the plate A<SP>2</SP> when the frame is lowered into working position but springing outwards to allow the roll Fl to be replaced when the frame is swung upwards about the pivot E<SP>2</SP>. The flexible strip F is drawn from the roll F<SP>1</SP> over the roller E<SP>4</SP> through a guide and between the friction feed roller and idler roller to pass out through a slot B<SP>6</SP> in the lid B, Fig. 2. The guide comprises an upper element 6 in the form of an arcuate trough, Fig. 6, carried by a plate G<SP>1</SP> having vertical slots through which extend studs screwed into sockets in the bracket supporting the plates E. A spring G<SP>5</SP>, Fig. 4, attached to the plate A<SP>2</SP>and to a stud G<SP>4</SP> on the plate G<SP>1</SP> urges the element G upwards through the opening in the plate A<SP>2</SP> towards a complementary element L, Fig. 2, supported by an arm H<SP>3</SP> of a carrier H hinged on the pin B<SP>1</SP> by lugs H<SP>1</SP> extending freely through slots in the cover B. The carrier H also supports a moving- coil pen unit K with pen spindle K<SP>1</SP> and pen K<SP>2</SP>, the curvature of the elements G, L being coaxial with the pen axis X-X. The pen K<SP>2</SP> extends freely through a slot H<SP>5</SP>, Fig. 6, in an angleplate H<SP>4</SP> mounted on the arm H<SP>3</SP> and the lower edge of the slot H<SP>5</SP> has raised parts H<SP>6</SP> which lift the pen if it passes beyond the edge of the strip and so prevents it catching on return. Three switches are attached to the underside of the plate A<SP>2</SP>, a master switch N controlled by a stud N<SP>1</SP> extending upward through the plate A<SP>2</SP> and two switches P, P<SP>1</SP> controlled by a knob P<SP>2</SP>. The switches N, P are in series with each other and the pen, while the switch P<SP>1</SP> is in series with the motor C. A button B<SP>2</SP> is arranged in the lid B, to bear on a spring latch B<SP>3</SP> whose other end co-operates with a notch B4 in the casing of the pen unit K. Lost motion between the latch B3 and notch B<SP>4</SP> allows the lid to open a short distance before picking up the pen unit and the further opening of both is limited by a nose A<SP>7</SP> on a plate A<SP>6</SP> engaging the base A after the plate A<SP>6</SP> has been picked up by the engagement of a stud A<SP>5</SP> on one of the lugs H<SP>1</SP>. Upon closing the lid B, the last part of its movement alone brings the idler roller down to bring the flexible strip F in contact with the friction drive roller and at the end of its movement it closes the switch N to establish the circuit for the supply of power to the pen from an external source through a plug R when the knob P<SP>2</SP> is turned to close the switches P, P<SP>1</SP>. By pressing the button B<SP>2</SP> the lid B may be opened without lifting the pen unit K. The lid B which has a window B<SP>5</SP> is locked in closed position by a notched latch 17, Fig. 8, co-operating with a spring-loaded friction detent M<SP>2</SP> and bar M<SP>3</SP> fixed to the plate A2, being operated through a head M<SP>3</SP>. If the pen contacts the paper at an angle of 45 to 50 degrees, there is little tendency to damage of pen or paper, but if to reduce inertia a more obtuse angle is desired one of the devices shown in Figs. 9, 10 is employed to lift the pen from the paper in the initial stage of opening the lid. The bracket H<SP>4</SP> is hinged to the arm H<SP>3</SP> at S and is held at right-angles thereto by a stop N<SP>3</SP> on the lid against the action of a spring S<SP>1</SP> attached to the pen so that the pen is lifted by the plate H<SP>4</SP> as soon as the lid begins to open. To facilitate rapid withdrawal of the strip F through the slot B<SP>6</SP> a button C<SP>3</SP>, Fig. 6, is depressed to disconnect the drive C' from the feed roller. Specification 612,619 is referred to.