Patent GB-190424861-A (GB)
Title: Improvements in or relating to Machines for Inserting Pegs or other Fastenings or for Similar Operations.
Inventor: BOULT ALFRED JULIUS
Filed: 1904-11-16
Granted: 1905-11-16
Abstract: 24,861. Boult, A. J., [United Shoe Machinery Co.]. Nov. 16. Nailing. -Relates to the horns or work-supports of machines for inserting fastenings, and particularly to those of boot and shoe pegging machines of the type described in Specification No. 9828, A.D. 1897, [Abridgment Class Boots &c.]. The horn is arranged to exert a slight pressure on the work during the feeding of the latter, to compress the work prior to the driving of the peg, and to be held with considerable pressure against the work while the peg is being driven. It is preferably counterbalanced so that it will remain normally depressed when the machine is at rest. The main parts and the working of the machine are substantially the same as those described in the Specification referred to above. The horn shank 32 is, however, fitted with a spring 30, the lower. end of which bears against a vertically. adjustable foot-piece 31 carried by the machine frame. This foot-piece is adjusted to cause the horn to be balanced in its depressed position. When the spring-controlled operating- treadle 43 of the machine is depressed, rollers 51 engage cam-surfaces on the rearwardly-extending arms 48 of two levers 47 mounted one at each end of a stud 46 loosely carried in a bracket on the underside of the machine frame. This causes the levers 47 to swing forwards to the position shown, carrying with them springs 50, the forward ends of which engage the pin 44 at the lower end of the horn-slide or its actuating-yoke. The horn is thus raised to clamp the work with a light yielding pressure against a plate secured to the head of the machine. Before the treadle is fully depressed, however, it actuates a rod to release the clutch members on the main shaft, which move into contact and so start the machine. The awl then pierces the work and feeds it forwards, but during the feed, a rod 71 first opens the cutters, and then, at the end of the feed, actuates through a link 72 a bifurcated arm 74, causing it to oscillate about its pivot pin 75 until it is clutched to a bell-crank lever 76 pivoted loosely on the pin 75. The engagement of the arm 74 and lever 76 is effected by a roller 77, which is normally forced by a spring toward the narrow end of a recess formed between the upper end of the lever and the underside of the top piece connecting the forks of the arm 74. The front arm of the lever 76 is forked, and, when it is actuated by the arm 74, these forks engage lugs 79 on the horn-slide, and positively raise the horn to compress the stock, and to hold it compressed during the driving of the peg. An adjustable stop 80 determines the height to which the horn can be raised. A spring 83 secured to this stop and also to one end of the lever 76 tends to hold the forks of the latter up to the lugs 79. This spring therefore assists the spring 30 in balancing the horn. A safety stop 82 is also provided for disconnecting the arm' 74 and lever 76 when the forward end of the latter is abnormally elevated. Fig. 10 shows additional modifications, any or all of which may be applied to the construction shown in Fig. 5. To avoid breakage of any of the parts through accidental or improper adjustment, the rod 71, instead of being rigidly connected to its pivot pin 70, is mounted to slide through an adjustable amount in a socket 91. A spring 93 is interposed between a collar on the rod and a shoulder at the lower end of the socket. In order that the machine may be run without the horn being raised, as, for instance, when a new peg-strip is-being inserted, an auxiliary treadle 95 is provided for directly actuating the clutch mechanism on the main shaft. An additional clamping-device is also provided for holding the horn frictionally against vertical movement at all times during a cycle of operations, except when the work is being fed. The thin plates 41<a>, Fig. 11, that retain the hornslide 38 in its guideways are slightly recessed, and the portions of the arms 40 in which these ways are formed are cut away behind these recesses, as shown at 100. The front side of eich plate 41<a> is grooved to receive the rounded end of a toggleplate 102, the forward ends of which rest in grooves in the end hubs 106 of a rock-shaft 105 journalled in ears 103 formed integral with the machine frame. Depending from near the middle of this rock-shaft is an arm 110, which passes between rollers 113, 114 carried by pins 112 fixed between the forks of the link 67<a> actuating the cutter mechanism. As this link is reciprocated, the rock-shaft is oscillated by the alternate engagement of the rollers with the arm 110, causing the plates 41<a> to be bent into the recessed portions of the arms 40 and to bear upon the horn-slide to clamp the horn in position. The position of the rock-shaft 105 can be adjusted to regulate the force with which the horn-slide is clamped. In order to release the horn-slide automatically as the machine comes to rest, the treadle 43<a> is provided with an arm 116, to which is pivoted a plate 117 having a cam 118 adapted to engage a roller 119 on the arm 110. When the treadle 43<a> is released, the cam 118 causes the arm 110 to oscillate the rock-shaft 105 in a direction to release the clamp. A spring 122 is provided to swing the plate 117 rearwardly when the rock-shaft has been oscillated as far as it will go, so that the treadle 43<a> may rise to its highest position.