Patent GB-191127793-A (GB)
Title: Improvements in Advertising Devices and the like.
Inventor: HARRIS HENRY KINGSFORD
IPC: G09F7/00
Filed: 1912-02-10
Granted: 1913-04-17
Abstract: 27,793. Harris, H. K. Feb. 10, 1912. Optical-projection apparatus; kinematograph apparatus. - A device for selecting slides or transparent films bearing advertisements and the like is arranged simultaneously to move towards and to reach its initial position as the slide or band moves towards and reaches its exhibiting position. The selecting-device is then ready for re-setting, which can be effected while the exhibition is taking place. The apparatus may also be used with a kinematograph as hereinafter referred to. The selector mav be set by mechanical, pneumatic, or other means. but it is preferred to effect its operation by electrical impulses, and these may be transmitted as in wireless telegraphy. The form of selector shown comprises a ratchet - wheel S. Fig. 1, held by the tension of a spring u against the part 3 of an escapement w. Selection is determined by the position taken up by a projecting arm 33 on the wheel, and the setting is effected by energizing the magnet 13 connected to the escapement the requisite number of times. The band is carried on rollers c, e geared together, the roller e being connected to the driving-shaft d by a clutch device which slips when the tension exceeds a certain amount, so that a number of units may be operated from a common shaft. A separate motor may, however, be provided for each unit, The roller c is connected to its gear-wheel by a spiral spring g to allow for the change in the relative diameters of the rollers, and the movement of the wheel is limited by a pin k working in a slot m. In operation, the selector having been set previously, the motor is started to return the band to its zero position. When this is reached, the motor is reversed to move the band in the opposite direction, and at the same time a pawl 25 carried by a part working in a camgroove on the roller e, and which was previously inoperative, moves the selector back step-bystep, until the arm 33 engages the fork 28 and rocks it to bring a catch into the path of pawls 38 on the face of the roller e. The slipping device previously referred to separates the drive between the shaft and the roller. This device consists in one form of a spring-pressed part 48, Fig. 6, carried by the shaft and provided with inclined portions and a recess 51 at the crest of the inclines. A ring 43 with recesses 44 is carried by the roller, and engagement is effected by a roller 52 engaging a recess in the ring and the recess in the part 48. Excess tension causes the roller 52 to move out of the recess and ride down the inclines. When the drive is reversed, the roller returns to its initial position, and the drive is again taken up. Another form of clutch consists of a toothed wheel 53, Fig. 7, fixed to the shaft and a part 55 carried by the roller e. A sliding pawl 56 is mounted in this part and is pressed against the teeth in the wheel in such a way that excess tension causes the pawl to ride over the teeth. A device for setting the selector consists of a plate 60, Figs. 13 and 14, carrying a pointer moving over a dial in the casing and rotated by a handle 78, which is first depressed to cause a bolt to enter an aperture in the plate. Rotation of the plate causes contacts 71, 72, 73, 74 to move over a series of contacts 64, and contact rings 63, 62, 61 respectively. When, however, the handle is depressed, the circuit through these contacts is broken by the opening of contacts 76, 77 in their circuit. After setting, the handle is released, and the plate moves back under the tension of a spring 90 previously wound up, the speed of return being controlled by a vane 92. The contacts 76, 77 being now closed, a series of impulses is reproduced as the contact 71 moves over the contacts 64, and these impulses effect the setting of the selector. If a number of selectors are to be set, other contacts on the plate effect the movement of a commutator which brings the selectors of the other units into operation in succession. Starting and reversing of the motor may be effected by other contacts or the commutator, or this may be effected by separate contacts in the setting- device forming part of a high-tension circuit arranged to have no effect on the setting circuits. This circuit is brought into operation by a suitable actuation of the setting-device. The setting may be effected by a series of contacts produced by a telegraph top e, apertures &c. 112, 110, 108, Fig. 15, at one side effecting the setting of the selector, and others 109, 111, 113 the working of the commutator. A separate contact may be provided at the end of each section to start a timing-device, during the operation of which the band is at rest. The apparatus may be arranged so that the band may be set directly from letter to letter, and the returning of the band to the zero position avoided. In this modification, a pawl is arranged to be operated in whichever way the shaft d is rotating, and means are provided for reversing the drive from the shaft d if necessary. This can be effected by the selective energizing of opposed magnets, the armature of which carries suitably arranged gearing. The apparatus may be modified for use with an endless band bearing letters &c., the band being moved directly from letter to letter. The selector may control directly the motion of the driving-motor, for example, by providing the selector with an arm moving over a suitable ring, the motor being cut automatically when the contact moves off the strip. An arrangement of the apparatus with a kinematograph film is shown in Fig. 20, in which a roller 157 controlled in a similar manner to the roller e above referred to, is provided with a series of pins for driving the roller 159 carrying the band 156. The Provisional Specification describes also a device in which the band carries bars fastened across it which, by the actuation of a trip, are caught at the desired letter. The bars may complete the circuit in conjunction with the controlling-device, the magnet bringing the trip into position directly or indirectly. Specifications 6784/10, and 9254/11, [both in Class 3(i), Advertising &c. apparatus, Moving &c.], are referred to.