Improvements in Machines for Seaming Cans.


9979. Wheatley, W. H., [Bliss Co., E. W.]. April 30. Metal, sheet, seaming and joining.-In seaming- machines for joining the ends or heads of cans to the bodies, a construction is devised whereby conical deflecting-rollers can be used in connection with machines for seaming non-circular or irregularly-shaped, as well as circular, cans, the seaming- members travelling around the work, which is stationary, or the work being rotated and the seaming-members being stationary. Apparatus, such as that shown in Figs. 1 and 2, is used for seaming irregularly-shaped cans the work being stationary, Fig. 1 being a vertical sectional view through the seamer-hesd, and Fig. 2 a bottom plan view of the seamer - head and seaming- members. The seame-head 8 is carried on a hollow shaft 7, which is rotated through bevel gearing by a shaft 3, and within the shaft 7 is a spindle 9, carrying the chuck 11 and the cam 10, which is shaped to correspond with the shape of the can and guides the seaming-members 12, 13, 14 carried on the head 8. A roller 18 of each seaming - member moves in the cam-groove 10, the roller being mounted on an arm 17, on a sleeve 15, surrounding a spindle 24 on the seamer - head. To the sleeve 15 is pivoted at 20 a bell-crank lever 16, which carries the seaming-tool at one end, the other end being connected with a piston 21, sliding in a cylinder 22, and actuated by a spring to keep the tool from the work. The cylinder is carried on a slide 2, having a roller 32, with which a cam 19 on the spindle 24 engages to move the tool to the work. Thus the tool partakes of two movements, one due to the cam 10, which moves it parallel with the work, and the other to the cam 19, which moves it against the work. The crimping or curling tool or roll 33, Fig. 10, is carried on the member 12, the effect of the tool being to crimp or curl the flanges of the can, Fig. 9, into the shape shown in Fig. 10 ; the tool carried on the member 13 consists of conical deflecting-rollers 35, 36, which serve to bend the flange as shown in Fig. 11, and, finally, the tool carried on the number 14 consists of a roller 34 which serves to finish the seam, as shown in Fig. 12. In addition to the general movements described, the rollers 35, 36 receive a movement towards and away from each other at the proper time, and are also provided with controlling- devices by which they are maintained at a tangent to the contour of the work. The roller 35 is carried on a straddling device 37, which, as the tool is moved towards the work, is lifted towards the roller 36 by an arm 39 on a stud 38 having an upper arm which bears against the sleeve 15. Upon the return movement of the seaming-carrier, the rollers are moved apart. The rollers are maintained at a tangent to the work by rollers 41, 42, adapted to engage with cams 43, 44 on the chuck 11. To obviate the rollers 35, 36 projecting a distance over the corners of non-circular cans in rounding them, projecting portions 45, 45<a> and 46, 46<a> are located at the corners or turning points of the cans 43, 44 respectively. The various tools are brought into operation successively, the spindles 24 are rotated by gearing, as shown in Fig. 1, and the can is brought into the operating position on the chuck in the ordinary manner, In a modification of the seaming-member 13, the roller 18 is dispensed with, and the roller 35 is moved towards the roller 36 by a cam on the spindle 24 through lever &c. mechanism. Figs. 17, 19, and 21 show a modified apparatus in which the work rotates before the seaming-tools The work carried on a revolving chuck 106 is secured by a clamp 115, the clamp being simultaneously actuated with a clutch 110 for rotating the chuck by depressing a treadle 114. The preliminary tool 122 and the finishing- tool 123 are carried on a pivoted segment 125 which is operated by a handle 127 to bring either tool to the work. The segment is carried on a slide 128 which is held back by a spring 129 and is moved towards the work by a cam 130, operated, through mechanism as shown in Fig. 19, by working a lever 133. The intermediate seaming- tool, consisting of rollers 143, 144, Fig. 21, is carried on a slide 139, which is moved towards the work by operating a lever 157, which, through a lever 155, and a crank lever actuates a rack 154, in gear with a segment 146, on a pivot 145, having a cam 148 which actuates the slide. A second cam 147 moves the roller 143 towards the roller 144, through a rod 151 and crank 152. The chuck 106 is provided with a cam 120 on its underside, in which are located the rollers 121 of the seaming- members, which are carried on the pivoted brackets 170,171. Regulating-devices as in the former case are also used.




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