avoiding any locking or jam-ming of the parts

http://www.google.com/patents?id=rOtqAAAAEBAJ&q=jam#search

At Fig. 16 the finger 50 is shown as having
slipped off of the pin 53. When this disengagement
occurs, the carriage and the platen-
carrier should move slightly toward the left
55 under the action of the spring-drum or driving
power to renew their proper relationship
to the feed-rack, but if after the automatic
release of the feed-rack and before the carriage
and platen-carrier make this slight re-
60 turn movement toward the left the line-space '
lever be not released the rack would be
forced toward the right and cause a .jamming
or pressure between the finger 50 and the end
of the pin 53, if such pin were made rigid in-
65 stead of yielding, as shown. . When the condition
of affairs just described occurs, the finger 50 will force the pin inwardly against the action of its spring 57 a distance equal to the rebound or.return movement of the platen- carrier, thereby avoiding any locking or jam- 70 ming of the parts, which would injuriously affect the machine or throw its parts out of proper working position.