Patent GB-455885-A (GB)
Title: Improvements in stapling machines
IPC: B25C5/02
Filed: 1935-06-04
Abstract: 455,885. Stapling. PARROT SPEED FASTENER CORPORATION, 363, Broadway, New York, U.S.A. June 4, 1935, No. 364/36. Convention date, Sept. 1, 1934. Divided out of 455,866. [Class 89 (iii)] A stapling - tool of the desk type is provided with a rigid magazine and driver passage assembly designed to embrace the staple strip closely so as to prevent clogging due to play of the staple strip in the magazine, or to accumulation in the driver passage of adhesive from the strip. The base 11 of the tool comprises a metal frame 13<1>, resilient pads 17, 18 and anvil 33, and ears 23 to which the arm 12 is pivoted at 27. The magazine arm 12 is formed of a shouldered core 46, Fig. 3, a channel member 54 on which the staple strip rides, and side members 59, 60 formed with overhanging flanges 83, 84, and ribs 86, 87 which together form a guide channel on which the staple strip is closely enclosed, so that it cannot move laterally or distort under pressure of the pusher 150. The flanges 83, 84 are connected at the forward end of the arm 12 by a spacer member 66, Fig. 1, which overlies the staple strip at this point and is designed to give a rigid construction to the forward end of the magazine which will withstand the blows of the driver plunger 101 without risk of distortion. The member 66 has a downward extension 71 in which is a U-shaped slot 82<1> for issue of the foremost staple and which, with a cover member 92, forms a closely embracing guide passage 90 for the driver 104 and the staple being driven. The member 66 carries an upstanding post 99 forming a guide for a spring 100 which serves to elevate the plunger 101. The latter is a hollow, rectangular housing, and carries an operating knob 102 and a stud 105 on which tne driver blade 104 is pivoted, so that the latter is self-aligning in the passage 90. The close fit of the driver 104 in the passage 90 causes any adhesive deposited in the passage to be promptly ejected. The plunger 101 is guided between an upstanding member 110 secured to the side members 59, 60 and an embracing U-shaped member 177 secured to said side members and provided with a cover plate 167. A full-stroke mechanism for the plunger 101 includes a latch member 118 pivoted on a pin 116 in the member 110 and biassed by a spring 1201 so that its tongue 124, Fig. 7, tends to enter a slot 119 in the member 110. The plunger 101 has a lug 120 which moves in the slot 119, engagement of the lug with the upper end of the slot limiting the upward stroke of the plunger. A pawl member 128 pivoted in the member 110 is adapted to engage the latch 118 by its fingers 129, 132, and in apertures 126, 127 in the plunger 101 by its nose 131. Normally, the nose 131 engages the solid surface of the plunger 101 so that the latch 118 is held in a position where it does not interfere with movement of the lug 120 in the slot 119. If the plunger makes an incomplete stroke, the angular position of the member 128 becomes such that its nose 131 enters the lower recess 126 before the upstroke of the plunger is completed, so that the tongue 124 enters the slot 119 above the lug 120. The driver 104 is thus held below the staple-feeding slot 82<1>, so that a second staple cannot be fed into the driver passage. Supporting means for a staple during driving comprises a member 136 pivoted in the core 46 by a pin 135 and short slot 127 and pressed by a frusto-conical spring 143 to the position shown in Fig. 1. The slot 137 and the angular disposition of the spring 143 allow the member 136 to move longitudinally of the core as well as to pivot about the pin 135, under pressure of the driver 104, so that the frictional engagement of the member 136 with the back of the driver is reduced. Inclined surfaces and slots in the plate 71 and a recess 141 in the core 46 permit escape from the driver passage of portions of a staple which may have been cut up by the driver after being improperly registered in the passage. The pusher 150, Fig. 1, is secured to a plate 151 which has a cam extension 152 engaged in an opening 153 in a finger piece 155 which is pivoted at 156 to the rear end of the spring 159. By this arrangement, if the finger piece is drawn back and released with undue force, it will ride off the cam extension 152, so that undue shock upon the rear end of the staple strip is avoided. The spindle 162 of the spring 159 is arranged to be held in wound-up position by frictional engagement with the head of a lock-nut 165. An adjustable elevation of the arm 12 above the base 11 is secured by a latch 200 held by a spring 204. Specifications 455,866 and 455,886 are referred to.