JP5950094B2 - Recording device - Google Patents

Description

  The present invention relates to a recording apparatus that performs recording on a recording medium.

  2. Description of the Related Art In recording apparatuses represented by facsimiles, printers, and the like, there are rollers that transport recording paper, including a transport roller that precisely feeds recording paper as an example of a recording medium to an area facing the recording head, that is, a recording area. It is provided in various places.

  For example, the transport roller is constituted by a pair of rollers, a transport drive roller that rotates by receiving the power of a motor, and a transport driven roller that rotates in contact with the transport drive roller. Here, if the roller moves in the direction of the rotation axis, the recording quality is adversely affected. On the other hand, if the movement of the roller in the rotation axis direction is completely restricted, the rotational load of the roller may be increased.

  Therefore, while allowing the roller to move to the rotational axis direction to some extent, the roller is provided with some play in the rotational axis direction so that the roller does not basically move in the rotational axis direction. The structure which urges | biases a roller to a rotating shaft direction by a means may be taken. Patent Documents 1 and 2 disclose a configuration in which a roller is urged in a rotation axis direction by a spring.

Japanese Utility Model Publication No. 01-109029 (leaf spring 34 in FIG. 1) JP 2008-93995 A (spring 139 in FIG. 10)

In the configurations described in Patent Documents 1 and 2, since the spring for urging the roller is provided in an exposed state, there is a possibility that foreign matter may be caught. Therefore, in order to avoid this, a cover that covers the spring may be provided. preferable.
However, in recent recording apparatuses, there is a demand for further miniaturization, and in the case of providing the cover as described above, a space for that is required, and there is a demand for further miniaturization of the recording apparatus. I can not cope.

  Therefore, the present invention has been made in view of such a situation, and an object thereof is to realize a structure for protecting a means for biasing a roller in a space-saving manner.

  In order to solve the above problems, a recording apparatus according to the first aspect of the present invention includes a recording unit that performs recording on a medium, a rotary shaft of a roller that conveys the medium, and has a hollow portion at least on one end side, And an urging unit which is accommodated inside the hollow portion and urges the rotation shaft of the roller in the rotation axis direction.

  According to this aspect, the shaft end on at least one side of the rotation shaft of the roller for conveying the medium has a hollow portion, and the urging means for urging the rotation shaft in the direction of the rotation axis includes the hollow portion. Therefore, the biasing means can be prevented from being exposed without providing a cover for covering the biasing means, and a structure for protecting the biasing means can be realized in a space-saving manner. .

  According to a second aspect of the present invention, in the first aspect, the biasing means is a compression spring, and a first stopper that receives one end of the compression spring is inserted into the hollow portion and coupled to the rotating shaft. In addition, a second stopper that receives the other end of the compression spring is loosely inserted into the inlet of the hollow portion, and a frame member is provided to face the second stopper, so that the urging force of the compression spring is It has the structure which acts between the said frame material and the said rotating shaft through a 1st stopper and a said 2nd stopper.

  Since the rotating shaft rotates, the friction caused by the rotation is at least either between one end side of the urging means and the rotating shaft, or between the other end side of the urging means and the frame material. Occurs. Therefore, it is preferable that the rotating shaft or the frame material is formed of a material having good slippage (it is preferable that the coefficient of friction with the biasing means is low). However, the frame material and the rotating shaft are required to have high strength.

  In view of the above circumstances, in this aspect, a biasing force is applied between the frame material and the rotating shaft via the first stopper and the second stopper. Thereby, the freedom degree of the material selection of the said rotating shaft and the said frame material is securable.

  According to a third aspect of the present invention, in the second aspect, in the first stopper, an insertion end of the first stopper is fitted into a hole formed in the rotation shaft, and the first stopper is rotated. A protrusion for coupling to the shaft and a slit for displacing the protrusion toward the axial center of the rotating shaft are formed.

  According to this aspect, the first stopper has the protrusion and the slit, and the first stopper can be deformed by the slit and can be easily inserted into the rotating shaft. Then, the first stopper can be deformed to return to its original shape, and the protrusion can be fitted into the hole, thereby coupling the first stopper to the rotating shaft. Can be assembled easily.

  According to a fourth aspect of the present invention, in the second or third aspect, the second stopper is loosely inserted into a shaft portion formed on the first stopper, and the compression spring is inserted into the shaft portion. It is characterized by being.

  According to this aspect, the second stopper is loosely inserted into the shaft portion formed in the first stopper and is provided so as to be slidable with respect to the shaft portion, and the compression spring is provided on the shaft portion. Since it is inserted, it is possible to prevent the compression spring from moving in the direction intersecting the axial direction during the deformation.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the rotating shaft is a hollow shaft. According to this aspect, since the rotating shaft is a hollow shaft, the rotating shaft can be configured at low cost. Further, the urging means can be accommodated using the hollow structure.

The principal part side view of the inkjet printer which concerns on this invention. The perspective view of the one side edge part of a conveyance drive roller. The cross-sectional perspective view of the one side edge part of a conveyance drive roller. The perspective view of these assemblies (biasing mechanism) of an inner stopper, an outer stopper, an outer frame, and a compression spring.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. However, the invention is not limited to the embodiment described below, and various modifications are possible within the scope of the invention described in the claims. Assuming that these are also included in the scope of the present invention, one embodiment of the present invention will be described below.

  FIG. 1 is a side view of an essential part of an ink jet printer 1 which is an embodiment of a recording apparatus of the present invention, FIG. 2 is a perspective view of one end portion of a transport driving roller 3, FIG. FIG. 4 is a perspective view of an assembly (urging mechanism 26) of the inner stopper 25, the outer stopper 24, the outer frame 17, and the compression spring 27. In addition, the same code | symbol is attached | subjected to what shows the same structure, a position, etc. in each figure, and the overlapping description shall be abbreviate | omitted suitably.

  The ink jet printer 1 performs a recording operation by the ink jet recording head 9 and a paper transport operation by the transport driving roller 3 alternately to thereby record a recording medium (reference numeral P in FIG. 1; hereinafter referred to as “paper P”). This is a so-called serial type recording apparatus that performs recording. A paper feeding device (not shown) is provided on the right side (upstream side of the paper conveyance path) of the configuration shown in FIG. 1, and discharged on the left side (downstream side of the paper conveyance path) of the configuration shown in FIG. A tray (not shown) for receiving paper is provided.

  The paper P fed from a paper feeding device (not shown) passes between the guide 6 and the roller support member 5 and reaches between the transport driving roller 3 and the transport driven roller 4 which are paper transport means. . The transport driving roller 3 is a shaft that extends in the paper width direction (the front and back direction in FIG. 1). The shaft itself is a roller that transports the paper and is also a rotating shaft.

  In the present embodiment, the transport driving roller 3 is a hollow shaft formed by processing a metal plate, and wear-resistant particles are attached to a region (region excluding both shaft ends) where the paper is transported on the outer peripheral surface ( Thus, a friction coefficient between the paper P and the transport driving roller 3 is secured. In addition, since the conveyance drive roller 3 is a hollow shaft, it is lightweight and is configured at low cost.

  In the present embodiment, the transport driven roller 4 is a resin roller, and a plurality of the transport driven rollers 4 are provided along the rotation axis direction of the transport driving roller 3, and are supported by the roller support member 5. In the present embodiment, two transport driven rollers 4 are pivotally supported by one roller support member 5, and a plurality of the roller support members 5 are also provided along the rotation axis direction of the transport drive roller 3.

  The roller support member 5 is provided so as to be able to oscillate in a clockwise direction and a counterclockwise direction in FIG. 1 around an oscillating shaft (not shown), and by oscillating, the conveyance driven roller 4 is conveyed and driven. The posture (contact posture shown in FIG. 1) that is brought into contact with the roller 3 and the posture (not shown) that separates the transport driven roller 4 from the transport driving roller 3 are switched.

  The posture switching of the roller support member 5 is performed by a user operating an operation lever (not shown). Further, the roller support member 5 is provided in a state of being urged in a direction in which the conveyance driven roller 4 is brought into contact with the conveyance driving roller 3 by an urging means (not shown). The conveyance driven roller 4 is separated from the conveyance driving roller 3 so that, for example, when a paper jam occurs, the removal can be easily performed.

  A recording head 9 and a support member 11 are arranged opposite to each other downstream of the transport driving roller 3 and the transport driven roller 4. The recording head 9 is provided at the bottom of the carriage 7, and an ink cartridge (not shown) is mounted on the carriage 7, and ink is supplied from the ink cartridge to the recording head 9.

Reference numeral 8 denotes a carriage guide shaft, and the carriage 7 is guided by the carriage guide shaft 8 in the main scanning direction (paper width direction). A driving mechanism for driving the carriage 7 is not shown in FIG.
The support member 11 supports the paper P, and the support member 11 defines an interval (paper gap) between the paper P and the recording head 9.

  Subsequently, a discharge driving roller 13 and a discharge driven roller 14 are disposed as discharge means for discharging the paper P on the downstream side from the facing region between the recording head 9 and the support member 11. In the present embodiment, the discharge drive roller 13 is a rubber roller, and a plurality of discharge drive rollers 13 are provided at an appropriate interval along the paper width direction with respect to the rotation shaft 13a extending in the paper width direction.

  The discharge driven roller 14 is a roller having a large number of protrusions along the outer periphery, and by making point contact with the paper P, it is possible to prevent ink from adhering to the roller and transfer of the adhering ink to the paper. ing.

  Next, the conveyance drive roller 3 will be described in detail with reference to FIGS. As shown in FIG. 2, a transmission mechanism for transmitting power from a drive motor (not shown) to the conveyance drive roller 3 is provided on one shaft end side of the conveyance drive roller 3. Reference numeral 22 denotes a gear fixedly attached to one end of the transport driving roller 3. The gear 22 is a two-stage gear, and the first stage functions as a pulley around which a drive belt 20 that transmits the power of a drive motor (not shown) to the gear 22 is engaged. The second gear in the gear 22 transmits power to the discharge drive roller 13. As described above, power is transmitted from the drive motor (not shown) to the transport drive roller 3 via the drive belt 20 and the gear 22, and the transport drive roller 3 rotates.

  Reference numeral 18 denotes an inner frame, and the transport driving roller 3 is supported by the inner frame 18. An annular bush 30 formed of a resin material that realizes low friction is provided between the transport driving roller 3 and the inner frame 18. The conveyance drive roller 3 is inserted into the bush 30, and thereby the conveyance drive roller 3 is pivotally supported on the inner frame 18 via the bush 30. In addition, although illustration is abbreviate | omitted, the other side edge part of the conveyance drive roller 3 is similarly supported by the flame | frame via the bush.

  The conveyance drive roller 3 to which the gear 22 is attached is slightly movable in the rotation axis direction, and the other end along the direction of arrow A in FIGS. 2 and 3, that is, the rotation axis direction by an urging mechanism 26 described later. It is biased towards the side. For this reason, the gear 22 is pressed against the inner frame 18, and the gear 22 is pressed against the spacer 28 interposed between the bush 30 and the gear 22. As the transport drive roller 3 rotates, the gear 22 comes into sliding contact with the spacer 28, or the spacer 28 comes into sliding contact with the bush 30.

  Hereinafter, the urging mechanism 26 will be described. The urging mechanism 26 includes an inner stopper 25 as a first stopper, an outer stopper 24 as a second stopper, and a compression spring 27 as urging means, and these configurations are configured as a hollow shaft. Is housed inside one end of the transport drive roller 3.

  The inner stopper 25 is formed of a resin material in the present embodiment, and is formed on the transport drive roller 3 at the insertion end to the transport drive roller 3 (the side that becomes the tip when inserted into the transport drive roller 3). Protrusions 25b and 25b for fitting the inner stopper 25 to the transport driving roller 3 by fitting into the holes 3b and 3b are formed. In addition, slits 25 a and 25 a are formed in the inner stopper 25, and the protrusions 25 b and 25 b can be displaced toward the axial center side of the transport driving roller 3 by the slits 25 a and 25 a.

  That is, the diameter of the inner stopper 25 at the tops of the protrusions 25b and 25b is larger than the inner diameter of the transport driving roller 3 which is a hollow shaft. Can be reduced in diameter so that the inner stopper 25 can be easily inserted into the transport driving roller 3. The inner stopper 25 is formed so that the large-diameter portion 25 d on which the protrusion 25 b is formed is just in contact with the inner periphery 3 a of the transport driving roller 3 when inserted into the transport driving roller 3.

  Next, the inner stopper 25 is formed with a shaft portion 25c having an outer diameter smaller than that of the large-diameter portion 25d. A compression spring 27 is inserted into the shaft portion 25c, and the outer stopper 24 is provided at the tip of the shaft portion 25c. It is loosely inserted.

  The outer stopper 24 having an annular shape is formed of a resin material having high slidability, and is formed so as to be able to slide smoothly with respect to the shaft portion 25 c and the inner periphery 3 a of the transport driving roller 3.

  In such a configuration, the compression spring 27 exerts an urging force between the inner stopper 25 and the outer stopper 24. However, since the inner stopper 25 is coupled to the transport driving roller 3, the compression spring 27 is used as the inner stopper. The conveyance driving roller 3 is urged through the rotation axis direction (arrow A direction) via 25.

  The urging force of the compression spring 27 gives the outer stopper 24 a force in the direction of coming out of the transport driving roller 3 (the direction opposite to the arrow A direction). The outer frame 17 functions to stop the outer stopper 24 urged in the direction in which the outer frame 17 is pulled out from the transport driving roller 3 so as not to be pulled out from the transport driving roller 3.

  For this reason, with the rotation of the transport driving roller 3, the surface of the outer stopper 24 facing the outer frame 17 and the outer frame 17 are in sliding contact. At this time, when the sliding frictional resistance is increased, the rotation of the transport driving roller 3 is hindered, so that a protrusion 24 a extending in the circumferential direction is formed on the surface of the outer stopper 24 facing the outer frame 17.

  The protrusion 24 a contacts the outer frame 17, so that the contact area between the outer stopper 24 and the outer frame 17 is reduced. Since the outer stopper 24 is not fixed to the transport driving roller 3, the outer drive surface 3 slides between the outer peripheral surface of the outer stopper 24 and the inner peripheral surface 3 a of the transport drive roller 3 as the transport driving roller 3 rotates. In some cases.

  As described above, in the ink jet printer 1, the transport driving roller 3 that has a hollow portion at least on one end side and serves as a rotation shaft of a roller for transporting a medium is applied in the rotation axis direction by the biasing mechanism 26 (compression spring 27). Since the biasing mechanism 26 (compression spring 27) is housed inside the transport drive roller 3, the biasing mechanism 26 is protected to protect the biasing mechanism 26 (compression spring 27). It is not necessary to provide a cover that covers (compression spring 27). For this reason, the structure which protects the urging | biasing mechanism 26 (compression spring 27) is realizable in a space-saving.

  In the present embodiment, since the biasing force acts between the outer frame 17 and the transport driving roller 3 via the inner stopper 25 and the outer stopper 24, material selection for the transport driving roller 3 and the outer frame 17 is performed. Can be secured.

  In addition, in the present embodiment, the outer stopper 24 is loosely inserted into the shaft portion 25c formed on the inner stopper 25, and is provided so as to be slidable with respect to the shaft portion 25c. The compression spring 27 is connected to the shaft portion 25c. Therefore, the compression spring 27 can be prevented from moving in the direction intersecting the axial direction (the rotational axis direction of the transport driving roller 3) during the deformation.

  And as above-mentioned, since the conveyance drive roller 3 as a rotating shaft is a hollow shaft, the conveyance drive roller 3 can be comprised at low cost. Moreover, the biasing mechanism 26 (compression spring 27) can be accommodated using the hollow structure. In addition, even if it is not a hollow shaft, if a hollow part is provided at least at one end side, a biasing means for biasing the rotary shaft can be provided in the hollow part.

  Further, as described above, the present invention is applied to the transport driving roller 3 in the present embodiment. However, the present invention is not limited thereto, and the present invention can be applied as long as it is a rotating shaft of a roller that transports a medium in a recording apparatus. . For example, the rotation shaft 13a of the discharge drive roller 13 in FIG. 1 is an example.

DESCRIPTION OF SYMBOLS 1 Inkjet printer, 3 conveyance drive roller, 3a hollow part, 3b hole, 4 conveyance driven roller, 5 roller support member, 6 guide, 7 carriage, 8 carriage guide shaft, 9 recording head, 11 support member, 13 discharge drive roller, 13a Rotating shaft 14 Discharge driven roller, 17 Outer frame, 18 Inner frame, 20 Drive belt, 22 Drive pulley, 24 Outer stopper, 24a Tip, 25 Inner stopper, 25a Slit, 25b Boss, 25c Shaft, 25d Large diameter part 26 Biasing mechanism 27 Compression spring 28 Spacer 30 Bushing P Recording paper

Claims (4)

Recording means for recording on a medium;
A rotating shaft of a roller for conveying a medium, having a hollow portion at least on one end side;
A biasing means that is housed inside the hollow portion and configured by a compression spring that biases the rotation shaft of the roller in the direction of the rotation axis ;
A first stopper inserted into the hollow portion and coupled to the rotating shaft and receiving one end of the compression spring;
In the first stopper, an insertion end to the rotation shaft has a protrusion that fits into a hole formed in the rotation shaft to couple the first stopper to the rotation shaft, and the protrusion is an axis of the rotation shaft. A slit to be displaced to the center side is formed,
A recording apparatus. Recording means for recording on a medium;
A rotating shaft of a roller for conveying a medium, having a hollow portion at least on one end side;
A biasing means that is housed inside the hollow portion and biases the rotation shaft of the roller in the rotation axis direction;
The biasing means is a compression spring, and a first stopper that receives one end of the compression spring is inserted into the hollow portion and coupled to the rotating shaft,
A second stopper that receives the other end of the compression spring is loosely inserted into the inlet of the hollow portion,
Since the frame material is provided facing the second stopper, the urging force of the compression spring acts between the frame material and the rotating shaft via the first stopper and the second stopper. With configuration,
The second stopper is loosely inserted into a shaft portion formed on the first stopper;
The compression spring is inserted into the shaft portion;
A recording apparatus. 3. The recording apparatus according to claim 2, wherein an insertion end of the first stopper into the rotation shaft is fitted into a hole formed in the rotation shaft to couple the first stopper to the rotation shaft. And a slit for displacing the protrusion toward the axial center of the rotating shaft is formed.
A recording apparatus. The recording apparatus according to any one of claims 1 to 3 , wherein the rotation shaft is a hollow shaft.
A recording apparatus.

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