PULLEY HOLDER AND A DRIVE TRANSMISSION MECHANISM AND AN IMAGE RECORDING APPARATUS USING THE PULLEY HOLDER

Information

  • Patent Application
  • 20070155561
  • Publication Number
    20070155561
  • Date Filed
    December 26, 2006
    18 years ago
  • Date Published
    July 05, 2007
    17 years ago
Abstract
A pulley holder for rotatably supporting a pulley around which a belt is wound, in which the pulley holder includes a shaft having a shaft body for supporting the pulley and a projection at least one end of the shaft body in its axial direction, and a holder body having a bearing for supporting the shaft body, and a fitting part for fitting the projection. Since the projection is biased from an axis of the shaft body, once the projection is fit into the fitting part, the shaft body would not rotate around the axis. Accordingly, a friction wear of the bearing of the holder body is prevented and thus a shift in conveying a carriage is prevented.
Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS


FIGS. 1A and 1B are a plan view and a front view illustrating a known drive transmission mechanism, respectively;



FIGS. 2A and 2B are enlarged detailed views of a known driven pulley unit, respectively;



FIG. 3 is a cross sectional view of FIG. 2B taken along a line III-III;



FIG. 4 is an enlarged view illustrating a known insertion hole;



FIG. 5 is a perspective view illustrating an outer appearance of a multi-function apparatus according to an embodiment of the present invention;



FIG. 6 is a longitudinal cross sectional view illustrating an inner structure of the multi-function apparatus;



FIG. 7 is an enlarged cross sectional view illustrating a main structure of a printer unit;



FIG. 8 is a plan view illustrating a main structure of a printer unit;



FIG. 9 is a perspective view illustrating a mechanism in the vicinity of an image recording unit;



FIG. 10 is an enlarged view in the vicinity of a driven pulley;



FIG. 11 is an enlarged view in the vicinity of a hole;



FIG. 12 is a bottom surface view illustrating a nozzle forming surface of an ink jet recording head;



FIG. 13 is a schematic view illustrating an inner structure of the ink jet recording head;



FIG. 14 is a block diagram illustrating a structure of a controlling unit of the multi-function apparatus;



FIGS. 15A and 15B are cross sectional views illustrating essential parts viewing from XV-XV direction of FIG. 10;



FIGS. 16A, 16B and 16C are outer appearances illustrating a front shape and side shapes of the holder body, respectively;



FIG. 17 is a perspective view of the holder body viewing obliquely from a lower direction;



FIGS. 18A, 18B and 18C are views of outer appearance of a shaft viewing from three different directions;



FIG. 19 is an enlarged perspective view of the shaft;



FIGS. 20A and 20B are exploded perspective views explaining an assembly structure of the driven pulley;



FIG. 21 is a cross sectional view of FIG. 15B taken along a line XXI-XXI; and



FIG. 22 is a cross sectional view of FIG. 15B taken along a line XXII-XXII.


Claims
  • 1. A pulley holder for rotatably supporting a pulley around which a belt is to be wound, the pulley holder comprising: a shaft having a shaft body for supporting the pulley and having a projection at least one end of the shaft body in an axial direction thereof, the projection being biased from an axis of the shaft body and projecting in the axial direction of the shaft body; anda holder body having a bearing for supporting the shaft body and having a fitting part for fitting the projection.
  • 2. The pulley holder as claimed in claim 1, wherein the projection is formed into one piece with the shaft body.
  • 3. The pulley holder as claimed in claim 2, wherein the shaft is made of metal, and the holder body is made of synthetic resin.
  • 4. The pulley holder as claimed in claim 1, wherein the shaft body has a cylindrical shape and the projection has a cylindrical shape whose diameter is smaller than the diameter of the shaft body, the axis of the shaft body being parallel with an axis of the projection.
  • 5. The pulley holder as claimed in claim 4, wherein the projection is formed into one piece with the shaft body.
  • 6. The pulley holder as claimed in claim 1, wherein the holder body is molded using a die.
  • 7. The pulley holder as claimed in claim 6, wherein the holder body is angled with a predetermined draft for an easy releasing from the die.
  • 8. The pulley holder as claimed in claim 1, wherein the holder body has a pair of bearings, one of which supports one end of the shaft body and the other of which supports the other end of the shaft body, and the fitting part of the holder body is a groove provided adjacent to at least one of the bearings to receive the projection.
  • 9. The pulley holder as claimed in claim 1, wherein the holder body further has a stopper that is formed adjacent to the fitting part to prevent the projection being removed from the fitting part.
  • 10. A drive transmission mechanism, comprising: a first pulley connected to a driving source;a second pulley arranged at a position spaced from the first pulley by a predetermined distance;a belt stretched between the first pulley and the second pulley; anda pulley holder for rotatably supporting the second pulley, the pulley holder including: a shaft having a shaft body for supporting the second pulley and having a projection at least one end of the shaft body in an axial direction thereof, the projection being biased from an axis of the shaft body and projecting in the axial direction of the shaft body; anda holder body having a bearing for supporting the shaft body and having a fitting part for fitting the projection.
  • 11. The drive transmission mechanism as claimed in claim 10, wherein the holder body has a pair of bearings, one of which supports one end of the shaft body and the other of which supports the other end of the shaft body, and the fitting part of the holder body is a groove provided adjacent to at least one of the bearings to receive the projection.
  • 12. An ink jet type image recording apparatus comprising: an ink jet recording head for ejecting ink onto a record medium;a carriage on which the ink jet recording head is mounted;a belt to which the carriage is attached;a first pulley around which the belt is wound and which is connected to a driving source;a second pulley around which the belt is wound and which is arranged at a position spaced from the first pulley by a predetermined distance; anda pulley holder for rotatably supporting the second pulley, the pulley holder including: a shaft having a shaft body for supporting the second pulley and having a projection at least one end of the shaft body in an axial direction thereof, the projection being biased from an axis of the shaft body and projecting in the axial direction of the shaft body; anda holder body having a bearing for supporting the shaft body and having a fitting part for fitting the projection.
  • 13. The image recording apparatus as claimed in claim 12, wherein the holder body has a pair of bearings, one of which supports one end of the shaft body and the other of which supports the other end of the shaft body, and the fitting part of the holder body is a groove provided adjacent to at least one of the bearings to receive the projection.
  • 14. The image recording apparatus as claimed in claim 12 further comprising a guide rail on which the carriage is placed.
  • 15. The image recording apparatus as claimed in claim 14, wherein the guide rail is provided with a hole for receiving the pulley holder.
Priority Claims (1)
Number Date Country Kind
2005-380674 Dec 2005 JP national