Abstract:
On the opening stroke of a movable platen of an injectionmolding machine, a rod rearwardly projecting from that platen strikes a stop and displaces an articulated linkage, hinged to the platen, which transmits the relative motion of rod and platen at a reduced rate to a set of ejector pins supported on that linkage.
Abstract:
A fixed frame portion of an injection-molding machine carrier behind its movable platen a crank to which, at points approximately equispaced from its fulcrum, a pair of arms are articulated. One of these arms is pivoted to the movable platen whereas the other one is pivoted to a carrier connected with a set of ejector pins or a stripper plate. The spacing of the points of articulation of the two arms on the crank is so chosen that the separation of these points in the direction of platen motion is relatively wide in one limiting position and relatively narrow in the other limiting position of platen reciprocation whereby the carrier is thrust forward with reference to the platen as the latter is retracted.
Abstract:
A take-off member, interposable between a movable mold portion and its mate to receive the molded articles for removing them from the mold, has a seat for a molded article adjacent a chamber connected to a source of vacuum (or fluid pressure) by way of a pressure sensor which detects the lack of buildup of a pressure differential, caused by the absence of a molded article from the seat, to give an alarm signal.
Abstract:
A take-off plate insertable from above between the relatively movable mold portions of an injection-molding machine co-operates with a transfer plate cantilevered on a transverse shaft at the top of a column rotatable through 180*. The shaft carrying the transfer plate is coupled by a step-down bevel-gear transmission with a fixed tube surrounding the rotatable column so that this plate turns through 90* during each 180* swing. In its vertical position, the transfer plate confronts the elevated take-off plate and removes from it the newly formed article or articles extracted from the mold; these articles are held by grippers which are deactivated in a horizontal position of the swung-out transfer plate to release the articles into an underlying receptacle therefor.
Abstract:
A series of frustoconical plastic cups coming from an injectionmolding machine alight on a vibratile trough directing them onto a pair of ascending, parallel conveyor belts between which they are suspended with their smaller end down. At the output end of the conveyor the belts are twisted and spread apart to release the cups which are picked up by a vibratile chute for stacking against an end stop. The latter may be preceded by a detent retractable under the control of a photocell, disposed upstream along the chute, which detects the trailing end of a stack of cups and closes a gate to prevent the advance of further cups past the cell while a lifting fork raises the stack to the level of an adjoining table onto which the stacked cups are swept by a swingable arm. The trough may be tiltable into a reverse position to guide scrap away from the elevating conveyor at the beginning of a series of molding operations.
Abstract:
The movable platen of an injection molding machine is rigid with a nonrotatable lead screw whose rear end, remote from this platen, is engaged by a rotatable drive nut at a location beyond the tie rods on which the platen slides. The machine frame, supporting the fixed platen with reference to which the movable platen is displaceable, carries a motor which can be reversibly operated to turn the nut in either direction for respectively advancing and retracting the movable platen; a cylinder at the rear of the frame carries an axially movable piston which, upon a stopping of the motor in the mold-closed position, is brought to bear under hydraulic pressure against the nut to clamp the mold between the platens against the tie bars anchored to the frame.
Abstract:
Disk-shaped articles with a flat and a recessed side, coming from an injection-molding machine, are entrained by an upwardly sloping conveyor to an orienting head comprising a centrally positioned roller, of a width substantially less than the disk diameter, around which the articles must pass to reach a vertical chute feeding them to a stacking tube. A stationary flipper confronting the roll, just above the chute entrance, engages the undersides of articles riding around the roller with their concavities outwardly to reorient them; other articles, facing the roller with their concave sides, hug the roller more closely and therefore escape the flipper. For articles liable to overlap and nest on their way to the orienting head, the conveyor includes a stationary ledge defining one longitudinal edge of the transport path and a pair of moving belts defining the opposite longitudinal edge of that path, the two belts moving at the same speed and including an obtuse angle for unilaterally elevating and gripping a disk to advance it with a rolling motion tending to dislodge another disk resting on it. An eccentric impactor along the conveyor path, located above the level of a single disk, strikes the upper one of two nested disks to separate them.
Abstract:
A take-off plate insertable from above between the relatively movable mold portions of an injection-molding machine co-operates with a transfer plate cantilevered on a transverse shaft at the top of a column rotatable through 180*. The shaft carrying the transfer plate is coupled by a step-down bevel-gear transmission with a fixed tube surrounding the rotatable column so that this plate turns through 90* during each 180* swing. In its vertical position, the transfer plate confronts the elevated take-off plate and removes from it the newly formed article or articles extracted from the mold; these articles are held by grippers which are deactivated in a horizontal position of the swung-out transfer plate to release the articles into an underlying receptacle therefor.
Abstract:
An injection-molding machine with a set of stacked mold plates, defining several axially spaced mold cavities therebetween, includes an injection unit with one or more nozzles movable perpendicularly to the stack for contact with respective inlets, leading to the several cavities, which are aligned with these nozzles in the closed position of the multiple mold. The mold plates may be interconnected by a lazytong linkage or by lostmotion couplings for proper relative spacing in the open mold position.
Abstract:
The movable platen of an injection-molding machine is rigid with a nonrotatable lead screw engaged by a rotatable drive nut which is splined to a tubular input shaft surrounding the rear end of the lead screw. A cylinder on the machine frame carries an axially movable piston which, upon a stopping of shaft rotation in the mold-closed position, is brought to bear under hydraulic pressure against the nut to clamp the mold between the platens against the tie bars anchored to the frame. The input shaft is powered by a reversible two-speed motor which is switched to lowspeed operation in a terminal phase of a lead-screw stroke to absorb excess energy in a nondissipative manner.