Patent GB-981879-A (GB)
Title: An article holder for conveyor systems
IPC: B07C3/08
Filed: 1961-07-06
Abstract: 981,879. Endless conveyers; sorting letters. POSTMASTER GENERAL OF CANADA. July 6, 1961 [Sept. 19, 1960], No. 24507/61. Heading B8A. In a letter sorting system letters are fed from a stack 10 in a holder 11 so as to be presented in a position in which they are adapted to be engaged in the jaws 44, 46, of a holder 25 which together with a number of similar other holders 25 is connected to an endless chain to form a conveyer. A code on the letter representing the address is read by a photo-electric device (not shown) and at an appropriate delivery station according to the particular address a cam 77 (Fig. 7) is moved to the full line position to initiate the delivery of the letter from the holder 25 to the bottom of a stack in a holder 33 at the selected delivery station. Each carrier 25 has wheels 27, 28, 29, bearing on running rails 30, 31, and is connected by a chain 24 to the endless conveyer chain 17. The wheel 29 is pivotally mounted and spring loaded to engage the rail 30. The jaw 46 is slidably mounted in the frame of the carriage and is rigid with a plunger 53 which is spring loaded by a spring 55 to a normal position (Fig. 3). The jaw 44 is carried by pins 42, 63, slidably mounted in the parts rigid with the jaw 46. The lower portion of the pin 42 is adapted to be engaged by a cam 70 so as to raise the jaw 44 against the action of a coiled spring which tends to urge the jaw 44 into letter gripping engagement with the jaw 46. A projection 49 on the jaw 44 co-operates with a projection 50 to hold a letter in gripped position when the jaws 44 and 46 are in engagement and when the jaw 46 is in its normal lowest position (Fig. 3). The projection 50 is carried by a pillar 51 rigid with the frame 26 of the carriage 25 so that when the jaw 46 is raised, the projection 50 no longer stands proud of its surface as shown in Fig. 3. A cam follower 61 is slidable in a direction perpendicular to the plane of Fig. 3 so as to be brought into line with and engageable by a cam 71 (Figs. 7 and 10) thereby to raise the jaws 46 and 44 together at the selected delivery station. The cam follower 61 is moved into this position by the movement of the cam 77 (Fig. 7) at the selected delivery station according to the particular address code. The letter is thus brought up to the level of the base of the stack of the receptacle 33 at the selected station and a member 45 of the carriage 25 deflects the stack upwardly so that the letter can be brought into position at the base of the container 33 the back wall 83 of which causes the letter to be retained in the container. The jaws 44 and 46 pass through a slot in the base and in the back of the container 33. In a modification (Figs. 16 and 17) the carriage 25 has six running wheels 102 and has a jaw assembly 120, 122, which is movable upwardly against the action of a spring 110 by the action of cam followers 115 engaging cam surfaces 117, 118, corresponding to the cam surface 71 of Fig. 10. The aperture 122 is raised into the letter receiving position by the action of a cam follower 125 bearing on a further cam surface (not shown). Letter gripping teeth 127 mounted on the jaw 120 are retracted in the delivery position (Fig. 17) by the action of a cam 130 and a cam surface 131. In a modification of this jaw assembly (Fig. 18) a spring 150 helps to retain the letter when it is received from the reservoir 11 and prevents it from bouncing out of engagement from the jaws. A spring 152 is adapted to cushion the blow on the stack of letters at the delivery station. In a further modification of carriage 25 (Fig. 21) a linkage 167, 169, 171 is provided which has the effect in conjunction with a cam follower 163 co-operating with a cam 166 (corresponding to cam 71 of Fig. 10), of tilting the jaw assembly 160 so as to deliver a component of force to the letter stack in the container 33 which is normal to the plane of the letters in the stack. However, as the letters are being slid into position the jaw assembly 160 is then tilted into a position which causes the letter to move in a direction parallel with the base of the container 33 (Fig. 22, not shown).