Elastic bending mechanism for bi-directional adjustment of print head position
Mechanisms for adjusting the position of one or more print heads at an extremely fine resolution (e.g., less than 10 μm) are described herein. The adjustment mechanisms include a differential screw and an indexing wheel through which the differential screw extends. One threaded segment of the differential screw is connected to a threaded feature of a flexible body that is coupled to the print head(s), while another threaded segment of the differential screw is connected to a threaded feature of a rigid body that is coupled to a printer assembly. As the indexing wheel and differential screw rotate, the space between the flexible body and the rigid body changes based on the difference between the pitches of the threaded segments. The adjustment mechanisms described herein utilize the accurate, consistent motion of the flexible body upon experiencing pressure to effect predictable changes in the position of the print head(s).
1. An adjustment mechanism comprising:
a screw that includes
a first threaded segment that is connected to a threaded feature of a rigid body of a printer, and
a second threaded segment that is connected to a threaded feature of a flexible body coupled to a print head of the printer; and
an indexing wheel through which the screw extends,
wherein rotating the indexing wheel causes pressure to be applied to, or relieved from, the flexible body, thereby displacing the print head.
2. The adjustment mechanism of claim 1 , wherein the screw is a differential screw.
3. The adjustment mechanism of claim 1 , wherein the first threaded segment has a first pitch, and wherein the second threaded segment has a second pitch different than the first pitch.
4. The adjustment mechanism of claim 1 , wherein each revolution of the indexing wheel causes the print head to be displaced by a predetermined amount.
5. The adjustment mechanism of claim 1 , wherein stiffness of the flexible body is tailored to a single degree of freedom.
6. The adjustment mechanism of claim 1 , wherein the indexing wheel includes a specified number of detents.
7. The adjustment mechanism of claim 6 , wherein rotating the indexing wheel produces a displacement of no more than 1 μm per detent.
8. The adjustment mechanism of claim 1 , wherein the first and second threaded segments include geometric features that provide audible feedback or tactile feedback upon rotating the indexing wheel.
9. The adjustment mechanism of claim 1 , wherein rotational direction of the indexing wheel controls direction of displacement of the print head.
10. An adjustment mechanism comprising:
a differential screw that includes
a first threaded segment that is connected to a threaded feature of a rigid body, the first threaded segment having a first pitch, and
a second threaded segment that is connected to a threaded feature of a flexible body coupled to a movable component, the second threaded segment having a second pitch; and
an indexing wheel through which the differential screw extends,
wherein rotating the indexing wheel causes pressure to be applied to, or relieved from, the flexible body, thereby enabling bi-directional adjustment of the movable component.
11. The adjustment mechanism of claim 10 , wherein each revolution of the indexing wheel causes the movable component to be displaced by a predetermined amount based on the difference between the first and second pitches, and wherein the indexing wheel includes a specified number of detents.
12. The adjustment mechanism of claim 10 , wherein the flexible body is coupled to the movable component via one or more intermediary components.
13. The adjustment mechanism of claim 10 , wherein the flexible body includes at least one region having low stiffness that is designed to facilitate localized bending in a particular direction.
14. The adjustment mechanism of claim 13 , wherein the at least one region is associated with a structural deformity.
15. The adjustment mechanism of claim 13 , wherein the at least one region is comprised of a different material than the remainder of the flexible body.
16. The adjustment mechanism of claim 10 , wherein the movable component is a print head included in a printer, and wherein the adjustment mechanism further comprises:
a motorized component configured to automatically rotate the indexing wheel based on quality of prints produced by the printer.
17. A method comprising:
installing a first threaded segment of a differential screw within a threaded feature of a rigid body of a printer;
installing a second threaded segment of the differential screw within a threaded feature of a flexible body coupled to a print head of the printer; and
enabling a position of the print head to be adjusted by rotating an indexing wheel through which the differential screw extends,
wherein rotating the indexing wheel in a first direction causes pressure to be applied to the flexible body, and
wherein rotating the indexing wheel in a second direction causes pressure to be relieved from the flexible body.
18. The method of claim 17 , further comprising:
acquiring the differential screw that includes
the first threaded segment having a first pitch, and
the second threaded segment having a second pitch; and
extending the differential screw through the indexing wheel.
19. The method of claim 17 , wherein rotating the indexing wheel in the first direction results in displacement of the flexible body in a corresponding stitch direction, and wherein rotating the indexing wheel in the second direction results in displacement of the flexible body in an opposite stitch direction.
20. The method of claim 17 , wherein the indexing wheel enables manual bi-directional adjustment of the position of the print head.