Patent GB-191022774-A (GB)
Title: Improvements in and relating to Recording Targets.
Inventor: ROSE SYDNEY ASTON MERSEY
IPC: F41J7/00
Filed: 1910-10-01
Granted: 1911-09-21
Abstract: 22,774. Rose, S. A. M. Oct. 1. Targets. - Relates to indicating - apparatus for targets of the kind wherein a flexible strip i<1>, forming the target, or arranged behind a stationary target, is passed over a series of contacts b, one or more of which pass through the shot hole i' to close an electric circuit containing an indicator c. The invention consists chiefly in (1) using two electric circuits a, f which are alternately open and closed with respect to each other, the circuit a serving to show the elevation of the shot on the indicator, while the circuit f serves to operate the winding-mechanism of the target strip and also to operate means for displacing the indicator in an horizontal plane synchronously with the target strip; and (2) in the method of mounting the indicator whereby it can be returned to its normal position. The circuit a contains the contacts b, of the construction described in Specification 2708/08, an electro-magnet d operating a switch e in the circuit f, and the indicator c. In the circuit f is arranged an electro-magnetic clutch g, rotated by a motor h and driving, by worm gearing, a roller i for winding-up the target strip i<1>, and a table on which the indicator is mounted. The indicating-apparatus consists of a replica m<1> of the target, and a pointer c<2> attached to the coil of a moving-coil instrument k of known construction. The target strip is set in position by means of gauge - holes i<2>. On the target strip being perforated, a switch j is closed, short-circuiting the circuit a, and thereby de-magnetizing the magnet d to release the switch c, which closes the circuit f to operate in a synchronous manner the target strip and table l. When the shot-hole i<3> comes opposite a contact, the circuit a is again completed and the circuit f broken, thereby sending a current through the indicator and displacing the pointer c<2> a distance corresponding to the resistance switched in by the particular contact b. The switch j is again closed, and the target strip wound up until the next gauge hole comes over the contacts. The table l is rotatably mounted on a stand d<2> and has connected to it a spiral spring l<3>. The worm shaft c<1> is pivotally mounted at one end in a bracket c<4> so as to swing in an horizontal plane, and at the other end in a bearing c<5> which is carried by a spring so as normally to press the worm into engagement with the teeth on the table and is held by a projection c<6> engaging a catch c' on an arm n. During the rotation of the table a spring l<4> engages the bearing c<5>, and towards the end of the travel of the table a projection l' engages a stud n<1> on the arm n and raises it to remove the catch c', whereupon the bearing c<5> is forced out by the spring l<4>, and the table returns under the action of the spring l<3>, a retarding dash-pot device p being used to prevent a too rapid return. The bearing c<5> is prevented from returning by a catch n<2> on a spring arm n<3> and is released by an arm l<3> on the table throwing the arm n<3> with its catch out of action. The gauge-holes i<2> may be dispensed with and the shot-holes used instead, in which case the table is released by a hand-operated head r<1> on a shaft r passing through the indicator casing and carrying a lever q having two projections q<1>, q<2> the former engages with an inclined pin q<3> on the arm n to raise the arm and release the catch c<7> from the bearing c<5>, while the latter prevents the bearing from returning until the shaft r is released. Lamps a<2>, a<6> may be arranged in circuits to light the target and replica. A flexible strip may be printed with the target by arranging a printing-block and electro-magnet on the two sides of the strip, the printing-block being pressed against the paper when the magnet is energized.