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US 6,287,104 B1Granted
Mechanical safety cover interlock for an injection-molding machine
OwnerKarl Hehlinventor
Life of this patent
Estimating the term…
Abstract
A mechanical safety cover interlock for an injection-molding unit has a protective device that covers the mold clamping area. As soon as the protective device is moved from its protecting position, a sensor for an auxiliary circuit emits an electrical signal. As a result of the electrical signal, a control element uses the force of elastic means to steer blocking mechanisms into a blocking position with a blocking section of a locking rod, which hinders the movement of the movable mold carrier when in the blocking position. The position of the control element is monitored with the aid of a position monitoring arrangement.
Claims19
In a mechanical safety cover interlock for an injection-molding machine for the processing of plasticizable masses, including:
- a stationary mold carrier;
- a clamping unit;
- a movable mold carrier displaceable by the clamping unit in an axial direction parallel to a mold closing direction of the machine from and to a position of interlock with the stationary mold carrier;
- a mold clamping area extending between the movable mold carrier and the stationary mold carrier;
- in said mold clamping area parts of a mold can be fixed on the movable mold carrier or the stationary mold carrier;
- a support element, arranged behind the movable mold carrier as seen from the stationary mold carrier, for supporting the clamping unit for the movable mold carrier;
- force transmission elements for transmitting forces occurring in a closed position from the stationary mold carrier to the support element and to the movable mold carrier;
- a protective device covering the mold clamping area while in a protecting position and movable in the axial direction;
- a locking rod extending in the axial direction and including a blocking segment;
- a mechanical blocking mechanism operating jointly with the blocking segment of the locking rod and including blocking means for blocking movement of the movable mold carrier by engagement with the blocking segment;
- the blocking means being movable counter to the force of an elastic means to be in a non-blocking position and, when located in the non-blocking position, being movable relative to the locking rod during a movement of the movable mold carrier;
- and
- a control device positively engaging the blocking means with the blocking segment of the locking rod when the protective device is moved from the protecting position and permitting movement of the locking rod relative to the blocking mechanism when the protective device is in the protecting position;
- the improvement wherein the control device includes
- a sensor for detecting whether the protective device is in the protecting position and for emitting an electrical signal when the protective device is not in the protecting position;
- a control element for steering the blocking means into the blocking position in response to the electrical signal and the force of the elastic means;
- and
- a position monitoring means for monitoring the position of the control element.
15 more elements
In a mechanical safety cover interlock for an injection-molding machine for the processing of plasticizable masses, including
- a stationary mold carrier;
- a clamping unit;
- a movable mold carrier movable by the clamping unit in an axial direction parallel to a mold closing direction of the machine from and to a position of interlock with the stationary mold carrier;
- a mold clamping area, extending between the movable mold carrier and the stationary mold carrier;
- in said mold clamping area parts of a mold can be fixed to the movable mold carrier or the stationary mold carrier;
- a support element arranged behind the movable mold carrier as seen from the stationary mold carrier, for supporting the clamping unit for the movable mold carrier;
- force transmission elements for transmitting forces occurring in a closed position from the stationary mold carrier to the support element and to the movable mold carrier;
- a protective device covering the mold clamping area while in a protecting position and being movable in the axial direction;
- a locking rod extending in the axial direction and including a blocking segment;
- a mechanical blocking mechanism operating jointly with the blocking segment of the locking rod and including blocking means for blocking movement of the movable mold carrier by engagement with the blocking segment;
- the blocking means being movable counter to the force of an elastic means to be in a non-blocking position and, when located in the non-blocking position, being movable relative to the locking rod during a movement of the movable mold carrier;
- and
- a control device positively engaging the blocking means with the blocking segment of the locking rod when the protective device is moved from the protecting position and permitting the movement of the locking rod relative to the blocking mechanism when the protective device is in the protecting position;
- the improvement wherein the control device includes
- a sensor for detecting whether the protective device is in the protecting position and for emitting an electrical signal when the protective device is not in the protecting position;
- a control element for steering the blocking means into the blocking position in response to the electrical signal and the force of the elastic means;
- and
- a position monitoring means for monitoring the position of the blocking means.
15 more elements
Dependencies are inferred from the claim text.