Patent GB-145971-A (GB)
Title: Improvements in and relating to automatic weighing machines
IPC: G01G13/00
Filed: 1919-06-23
Abstract: 145,971. Heimann, A. June 23, 1919 Indicating -mechanism. - An automatic weighing machine embodying an advertising device actuated periodically by a motor and also through a handoperated member when the weighing mechanism is actuated, comprises means for preventing repeated actuation without the operation of a part such as a coin controlled part, automatic means for rewinding the motor and adjusting means for the weighing mechanism. The machine is provided with a case having side windows 2 and an upper window 3, and behind these windows are mounted advertising drums 4, 7 driven by gearing from a shaft 6. The shaft 6 is actuated by a motor and by the operation of a handle by a person using the machine, this also causing a direct actuation of the advertising device. The weighing mechanism comprises a fxed cross-head 11 connected by weighing springs 12 to a floating cross-head 13 connected to the weighing platform by a rod 14. The indicating pointer 16 is actuated through a pinion 19, Fig. 4, by a rack having a damping piston 23, Fig. 3, working in a cylinder 24. The rack rests on a rod 26 which rests in a socket 27, Fig. 1, in the cross-head 13. The operation of the indicating pointer is normally checked by a ratchet-wheel 29 on the shaft 17 of the pointer and engaged by a detent 30. Disengagement of the detent allows the rotation of the ratchet, but means are provided in the mechanism which releases the detent to prevent rotation till the operating handle 31, Fig. 2, has been returned to normal position. The handle 31 is arranged on a spring-returned slide 34 having a socket which engages a dog 36a, Fig. 1, on a spring-returned lever 36 acting when pulled down through a link 37 to lower a slide 38, Fig. 2. An actuator 41 is pivoted at 42, Fig. 4, on the slide, and is allowed a limited pivotal movement by a pin 43 and slot 44. With the slide in normal or elevated position, the end of the actuator engages and holds up a spring- pressed detent pawl 46, which otherwise engages a pin 49<a> of the wheel 29. The actuator is controlled to release the detent 30, in accordance with the presence of a coin in associated coin feed mechanism, by a stem 56, connected with said mechanism, engaging the toe 55 of a lever 51 mounted coaxially in spring connexion with a lever 50. If a coin has been inserted, the stem 56 is moved upward, the arm 51 is moved to the left, and a dog 57 on the arm 51 is thereby brought into the path of an arm 58 on the actuator. When the slide and actuator descend on operation of the handle 31, the actuator is rocked to the left and remains in that position owing to the action of a spring 59. The actuator is then immediately beneath the end of a rod 60 which acts when raised through a pin 63, lever 64, pin 65, lever 66, 68 and pin 69 to raise the detent 30. The stem 60 carries a damping piston 61 working in a cylinder 62. As the actuator is raised, its arm 58 engages a stud 70 which moves the actuator to the right so that it engages the roller 45 and holds up the detent 46. At the same time a roller 71, Fig. 1, on the link 37 engages the arm 50 and rocks it to the right, thus moving the arm 51 so that the dog 57 is out of the path of the actuator arm 58. To provide for adjusting the weighing mechanism, the cross-head 11 is mounted on trunnions 119, Fig. 3, formed in a tubular stud 120 guided in the bracket 10 and adjustable by a nut 121, rotatable by gearing 126 - - 129 rotated from a head 131, Fig. 1. A collar 123 having a finger 124 extending into a slot 125 is provided to prevent the sleeve 120 from rotating when the nut is rotated. The pointer 16 is arranged to rotate in front of the cover-plate 33, and passes through a slot 134 in the plate when the latter is placed in position. The pointer slides longitudinally in a head 135 secured on the spindle 17, being frictionallv held by a spring 136 so that it may be extended beyond the limits of the slot 134, this being effected by an arm 138 controlled by a spring 139 and mounted on a rock-shaft 141 connected by a lever 142 and link 143 to a lever 144 operated by the bolt 146 of a lock 145. The lock bolt also serves to secure the cover-plate by engaging the hooked end of an arm 147 with a catch 150.