Patent GB-191119513-A (GB)
Title: Improvements in or relating to Typewriters for Writing Syllables.
Inventor: SCHIESARI MARIO
IPC: B41J3/26
Filed: 1911-09-01
Granted: 1912-05-02
Abstract: 19,513. Schiesari, M. Sept. 1. Type-wheel actions.-In a machine for writing syllables or single characters, key - set typemembers are moved to impression and the working - parts are restored to initial position by means of a relay-mechanism which comes into action automatically when the keys are released at the end of the setting of a syllable or a single character. (1) In the arrangement shown, the type-members consist of sectors 18 pivoted at 19 to slides 23 and adapted to be rotated for setting by means of push-rods 9<1> formed on stopbars 9 which are guided to move obliquely and are tensioned to the rear by springs 12. Each of the bars 9 is arranged over a plate 5 pivoted at 6 and held horizontal by a spring 5<1>, there being one plate for each column of keys. The bars 9 are normally held back by engaging stops on the plates 5, but when any key is depressed the corresponding plate releases its bar 9 which moves to the rear until arrested by engagement of one of a series of stop-lugs 10, Fig. 9, with the key-stem 3. The movement of the bar is dependent on the key selected, and the pushrod 9<1> thus rotates its sector 18 to bring the corresponding type to the printing line. When a syllable is to be printed, the letters are selected by operating keys in different columns and thereby setting the corresponding sectors. The space-key 14 is mounted on a lever 15 and controls a sector 18 having a blank periphery. (2) The relay-mechanism comprises a spring- drum 41, described below, carrying a toothed wheel 40 which is controlled by a pawl 52 and engages an arm 39 on a rock-shaft 32. The selected sector or sectors are moved to impression by a cross-bar 31 guided in slots 30 and coupled by links 34 to arms 33 which are loose on the shaft 32 and are provided with returning-springs 38. The bar 31 is secured loosely to a cross-bar 35 which is coupled by links 37 to arms 36 fast on the shaft 32. The pawl 52 is controlled from the keyboard in the following manner. Each of the plates 5 can actuate by a finger 61 a bar 59 carried by links 62 and adapted to raise a latch 64, Fig. 9, which normally retains an arm 57 on a rotatable bracket 53 carrying the pawl 52. When any key is depressed, the arm 57 is released from the latch but is held by a pin 58 on the bar 59 until the finger is taken off the key, whereupon the pawl 52 is turned by the pressure of the wheel 40 into the position shown in Fig. 9. The wheel 40 is thus released, and, by pressure on the arm 39, turns the shaft 32 and moves the selected sector or sectors to impression. In setting up a syllable, one of the keys is held depressed until the setting is completed, and is then released to trip the relay - mechanism. (3) The parts are restored to the initial position by the following devices. During the printing- stroke of the shaft 32, an arm 66 thereon engages a rod 67 which turns the bracket 53 and brings the pawl 52 into the plane of the wheel 40, the latter turning the pawl downwards. The pawl is coupled by a link 55 to an arm 56 on the shaft 32, and the downward movement of the pawl turns the shaft backwards and thereby brings the connected parts back to the initial position with the arm 39 resting on the next tooth of the wheel 40. The shaft 32 is coupled by a link 70 to a pivoted frame 71 which releases the keys in the manner described below. (4) The spring-drum 41 is provided with winding and stop devices of the following character. The drum is formed integrally with the wheel 40, and is mounted loosely on a shaft 42, Fig. 9, the ends of the spring being secured to the shaft and to the drum. The spring is wound by pulling a cord on a loose drum 45 which carries a pawl 47 engaging a wheel 48 on the shaft 42. To prevent over-winding or unwinding of the spring, the drum is arranged to engage by arms 49 with a wing-nut 51 on a threaded part of the shaft. When the spring is fully wound, the nut engages the drum and prevents further winding; similarly, when the spring has run down, the nut engages the face of the wheel 48 and prevents further actuation. The impression is adjusted by varying the tension of the spring. Alining for impression.-The sectors 18 are formed with internal teeth which are engaged during the printing stroke by the cross-bar 35. Key interlocks. - When the fingers are released, the keys 1 rise slightly and are then locked by the engagement of the stop-lugs 10 with the angled ends 31 of the stems 3. The keys are released from the lock by the engagement of the pivoted frame 71 with lugs 11 on the push-rods 9<1>. Letter-spacing mechanism.-The carriage 90 is provided with variable-spacing escapement mechanism comprising a fast dog 75 pivoted on a stud 74 and a loose dog 76 pivoted on a slide 78, the dogs being alternately engaged with the feed - rack 93 by means of a rock-shaft 83 formed with wings 84, 85 engaging the dogs. The shaft 83 is actuated by means of an arm 89 on the shaft 32 and a slide 88 which is coupled to the rotatable bracket 53 and is arranged to engage an arm 86 on the shaft. The slide-bars 23 are wedge-shaped and are arranged, as shown in Fig. 7, between a fixed guide 24 and a movable guide 25 which is mounted on parallel links 28 and is provided with an arm 82 engaging a lug 81 on the slide 78 carrying the loose dog. During the printing stroke, the wedges move the guide 25 with the dog 76 to the right as many letter-spaces as there are sectors advanced. During the return stroke, the fast dog 75 is released and the loose dog moves with the carriage to the left until arrested by a fixed stop 80. The advance of a single sector or the operation of the space-key 14 causes the carriage to advance a single letter-space. Ink-ribbon mechanism.-The vibrator consists of arms 96 pivoted at 97 and arranged in the path of the cross-bar 35.