Grippers

Page 5 Specifications subject to change without notice or incurring obligations. Problem #6: Competitive grippers are difficult to attach to their mating actuator arm. Solution: SPG Grippers can be easily doweled into mounting surfaces with either of the following approaches: (1) Use SPG Gripper "Option A" which provides a center locating dowel on top of the gripper. Machine a slip fit channel .030" deep into customer's tooling to accept Gripper dimension "B". "B" is machined to a tolerance of ±.001 on all SPG Models. Mounting the gripper is accomplished by "slipping" the grip- per's dowel into a slip fit dowel hole and pushing the gripper into the machined channel. Removal is easy and does not required "prying" the gripper off of two "stuck" dowel holes. (2) The second method utilizes the slip fit dowel slot that is included with the center locating dowel pin " Option A ". The center dowel pin establishes gripper centerline on an X–Y plane. The end dowel locates the X Axis preventing rotation. The "Q" dimension is not critical. It can be held to ±.005 and still provide precision engagement in the gripper dowel slot. Solving conventional gripper problems with only 3 moving parts! Problem #5: Competitive grippers are dif- ficult to repair – lots of parts, etc. Solution: SPG Grippers have only three moving parts, and six total! Left and right jaws are identical. Left and right cylinder blocks are identical. Porting block is doweled to cylinder blocks. SPG grippers are easy to repair. They can be disassembled and reassembled in minutes – literally! There is no adjusting of gibs, no "timing" or synchronization" of mating parts. Replace- ment of wear parts is generally limited to seals – and possibly the synchronizing rocker arm ! 7/24/97A Special Example #1 Verifying parts presence and/or gauging The symmetrical nature of the SPG Gripper allows a pair of prox sensors to be installed on each side. Two sensors on one side of the gripper are used to verify full open and full close jaw positions. The two sensors on the opposite side can be set so that each sensor is "just made" when a part is gripped. An oversize, under- size, or missing part will cause enough jaw travel that one of the two sensors will "drop out", indicating a "no go" situation. If both sen- sors are "made", a gripped part is present and within tolerance. Special Example #2 Three position jaws Fabco-Air has made three-position grippers by modifying the booster piston of a High Force SPG Gripper and installing it at one end of the gripper. Line pressure applied to this booster piston overrides " Jaw Open" pressure – and will position the jaws in a "mid" location. From this "mid" position, the jaws can be either opened or closed allowing I.D. or O.D. gripping if a family of parts is to be handled with the same gripper. Special Example #3 Application tip – Escapement Device The SPG Gripper can be used as a programmable escapement device by simply specifying option "Q", non-synchronous motion. In this configuration each jaw can be operated independently with its own 4-way air valve. "Tick-tock" tooling fingers can be attached to the jaws and two sets of sensors added to provide "open/close" verification for each jaw. Typical Escapement Sequence: 1) Left jaw closes 2) Right jaw opens (part escapes) 3) Right jaw closes 4) Left jaw opens (letting another part in) #6 Left Bearing Block #5 Left Jaw #4 Right Jaw #3 Right Bearing Block #2 Rocker Arm #1 Porting Block Fabco-Air SPG Grippers are very versatile and can be modified to suit special applications as described in the following examples.

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