JP5593945B2 - Screw fall-off regulation structure - Google Patents

Description

  The present invention relates to a screw drop-off regulating structure.

  2. Description of the Related Art Conventionally, as a screw drop-off regulating structure, for example, a screw drop-off preventing structure shown in Patent Document 1 is known. The screw fall-off prevention structure of Patent Document 1 is a hole having a tapered surface with a wide screw insertion side, a minimum diameter N of the screw hole, and a diameter K of a round bar of the screw. The relationship with the thread diameter M of the screw is such that K <N <M, thereby preventing the screw from falling out of the screw hole.

JP-A-8-42546

  By the way, the screw drop prevention structure of Patent Document 1 has a problem in that a special screw that meets such a condition must be used because the above-described condition that K <N <M must be satisfied.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose is to prevent the screw from falling out of the screw insertion hole when the screw with the shaft inserted through the screw insertion hole is detached from the object even if a general-purpose screw is used. An object of the present invention is to provide a screw fall-off restricting structure that can be used.

In order to achieve the above object, the screw drop-off restricting structure of the present invention is configured to be movable between an attachment position attached to an object by a screw and a non-attachment position spaced from the attachment position. When the attachment member is attached to the object with the screw, the screw insertion hole through which the shaft of the screw is inserted, and the shaft is inserted into the screw insertion hole. A screw drop-out restricting structure provided with a restricting portion for restricting the screw from being removed from the screw insertion hole when the screw in a state of being detached from the object, wherein the screw insertion hole is the shaft of the screw. the provided in the attachment member so as to removably inserted, the restricting portion is provided integrally with the front Symbol securing member, the head of the screw in a state in which the shaft is inserted into the screw insertion hole Abutting and facing the screw insertion hole Comprising a contact portion which is urchin disposed, and a connecting portion to which the screw insertion holes in the securing member and the abutting portion is connected to an opening surface which is open at the lower side of the screw insertion hole.

  According to the present invention, even when a general-purpose screw is used, when the screw with the shaft inserted through the screw insertion hole is detached from the object, the screw is dropped from the screw insertion hole by the restricting portion. Can be suppressed.

In falling off regulating structure of the screw of the present invention, the distance from the previous SL contact portion to the opening plane is set to be shorter than the total length of the screw.

  According to the present invention, when the screw head is in contact with the contact portion, the screw shaft is inserted into the screw insertion hole, so that the screw is effectively prevented from falling out of the screw insertion hole. It becomes possible to do.

In the screw drop-off regulating structure of the present invention, the attachment member is configured to be rotatable between the attachment position and the non-attachment position around a shaft portion extending in a direction intersecting the vertical direction. .
According to the present invention, when the attachment member is rotated between the attachment position and the non-attachment position around the shaft portion, the screw is easily removed from the screw insertion hole. It is possible to prevent the screw from falling out of the screw insertion hole by the restricting portion.

In the screw drop-off restricting structure of the present invention, the restricting portion supports the screw from below in the vertical direction when the attachment member is rotated between the attachment position and the non-attachment position. To do.
According to the present invention, when the attachment member is rotated between the attachment position and the non-attachment position, the screw is supported by the restriction portion from the lower side in the vertical direction. It is possible to effectively suppress falling out of the hole.

  In the screw drop-off restricting structure of the present invention, the attachment member is constituted by a cover member that is attached to the object so as to be freely opened and closed, and when the cover member is fully opened, The screw tip faces upward.

  According to the present invention, in the state where the cover member is opened to the maximum, the screw tip of the screw faces upward, so that the screw easily falls out of the screw insertion hole. It is possible to suppress falling off from the screw insertion hole.

1 is a perspective view of an ink jet printer according to an embodiment. FIG. 2 is a perspective view of a main part of the carriage of the printer. The expansion perspective view of the sensor accommodating part of the carriage. The perspective view when the cover member is seen from the outside. The perspective view when the cover member is seen from the inside. The side view which shows the positional relationship of the control part of the same cover member and a screw. The principal part expanded sectional view which shows a state when the cover member of a sensor accommodating part exists in the obstruction | occlusion position in the carriage. The principal part expanded sectional view which shows a state when the cover member of a sensor accommodating part exists in an open position in the carriage.

  Hereinafter, an embodiment in which a screw drop-off regulating structure of the present invention is applied to an ink jet printer which is a kind of recording apparatus will be described with reference to the drawings. Further, in the following description, when referring to “front-rear direction”, “left-right direction”, and “up-down direction”, the front-rear direction, the left-right direction, and the up-down direction indicated by arrows in FIG.

  As shown in FIG. 1, an ink jet printer 11 as a recording apparatus includes a main body frame 12. A support base 13 is extended below the main body frame 12 along the left-right direction, which is the longitudinal direction thereof. On the support table 13, the recording paper P is fed along a direction (sub-scanning direction) from the rear side to the front side by a paper feeding mechanism (not shown).

  A main guide shaft 14 extends along the longitudinal direction (left-right direction) of the support table 13 above the support table 13 in the main body frame 12. Further, a sub guide shaft 15 extends in parallel with the main guide shaft 14 above the main guide shaft 14 in the main body frame 12. A carriage 16 as an object is supported on the main guide shaft 14 so as to be capable of reciprocating along the axial direction (left-right direction) of the main guide shaft 14.

  That is, a pair of left and right bearing portions 16a is provided at the lower rear surface of the carriage 16, and the main guide shaft 14 is slidably fitted to each bearing portion 16a. In addition, an engagement portion 16 b that is slidably engaged with the sub guide shaft 15 from the rear side is provided at the upper rear end of the carriage 16. The engaging portion 16 b is in contact with the sub guide shaft 15 while always applying a load due to the weight of the carriage 16.

  A drive pulley 17a and a driven pulley 17b are rotatably supported at positions slightly above both ends of the main guide shaft 14 in the main body frame 12. An output shaft of a carriage motor 18 serving as a drive source when the carriage 16 is reciprocated along the main guide shaft 14 is connected to the drive pulley 17a.

  An endless timing belt 19 partially connected to the carriage 16 is hung between the pulleys 17a and 17b. Accordingly, the carriage 16 is reciprocated in the left-right direction via the endless timing belt 19 by the driving force of the carriage motor 18 while being guided by the main guide shaft 14 and the sub guide shaft 15.

  The recording head 20 is supported on the lower surface side of the carriage 16, and a plurality of nozzles (not shown) are opened on the lower surface of the recording head 20. Also, an ink tank 21 filled with ink of each color is disposed in the lower left of the main body frame 12. The ink tank 21 is connected to the recording head 20 supported by the carriage 16 via a flexible ink supply tube 22. Accordingly, each color ink in the ink tank 21 is supplied to the recording head 20 via the ink supply tube 22.

  Then, the ink of each color supplied from the ink tank 21 to the recording head 20 is moved from each nozzle (not shown) onto the support base 13 while reciprocating the carriage 16 in the left-right direction (main scanning direction) along the main guide shaft 14. Printing is performed by jetting onto the recording paper P fed to the printer.

  As shown in FIGS. 1 to 3, the ink jet printer 11 includes a linear encoder 23. The linear encoder 23 includes two belt-shaped code plates 23 a extending along the moving direction (left-right direction) of the carriage 16 with respect to the main body frame 12, and a sensor housing portion 24 provided on the rear surface of the carriage 16. And a sensor 23b attached by a fixing screw 25.

  The code plate 23a has a large number of slits that open at a constant pitch along the main scanning direction, while the sensor 23b receives light emitted from the light projecting unit and passed through the slit by the light receiving unit. A control unit (not shown) counts the number of output pulses of the linear encoder 23 so that the position of the carriage 16 in the main scanning direction can be grasped.

  As shown in FIGS. 2 and 3, a cover member 26 as an attachment member for covering the sensor accommodating portion 24 is attached to the carriage 16 by an attachment screw 27 as a screw so as to be opened and closed. Therefore, the cover member 26 functions as a lid for the sensor housing portion 24. In this case, the attachment screw 27 is a general-purpose screw.

  When the cover member 26 is closed, the attachment screw 27 is provided above the sensor housing portion 24 in the carriage 16 in a state where the attachment screw 27 is inserted into the screw insertion hole 30a (see FIG. 4) of the mounting piece 30 of the cover member 26. The cover member 26 is attached (fixed) to the carriage 16 by being screwed into the screw hole 28 a of the cylindrical female screw portion 28. In FIG. 3, the cover member 26 is omitted.

  As shown in FIGS. 4 to 6, the cover member 26 includes a main body 29 having a substantially rectangular box shape that is long in the left-right direction as a whole. A mounting piece 30 having a substantially semi-disc shape is provided projecting upward at a position slightly to the right of the central portion in the left-right direction at the upper end of the main body 29. The attachment piece 30 is formed with a screw insertion hole 30a that penetrates the central portion of the attachment piece 30 in the front-rear direction. The inner diameter of the screw insertion hole 30a is set to be larger than the outer diameter of the shaft 27a of the attachment screw 27 and smaller than the outer diameter of the head 27b of the attachment screw 27. Therefore, the shaft 27a of the mounting screw 27 can be inserted into and removed from the screw insertion hole 30a.

  In a position corresponding to the mounting piece 30 at the upper end of the rear surface of the main body 29, the attachment screw 27 in a state where the shaft 27a is inserted into the screw insertion hole 30a is prevented from falling out from the screw insertion hole 30a to the rear side A restricting portion 31 is provided integrally with the main body portion 29. The restricting portion 31 is L-shaped when viewed from the left-right direction, and is a rectangular plate-shaped connecting portion 31a that extends straight horizontally rearward from a position immediately below the mounting piece 30 on the rear surface of the main body portion 29. And a rectangular plate-like contact portion 31b extending straight and vertically from the rear end (front end) of the connecting portion 31a. Therefore, the connecting portion 31 a connects the contact portion 31 b and the rear surface of the main body portion 29.

  In this case, the widths of the connecting portion 31a and the contact portion 31b in the left-right direction are both set to be the same as the width of the mounting piece 30 in the left-right direction. The rear surface of the main body portion 29 and the rear surface of the attachment piece 30 are flush with each other, and the region including the upper side and the rear surface of the attachment piece 30 from the portion where the restricting portion 31 is provided on the rear surface of the main body portion 29 is The screw insertion hole 30a is an opening surface 26a.

  In addition, when the tip of the shaft 27a of the attachment screw 27 is inserted into the screw insertion hole 30a, the head 27b of the attachment screw 27 comes into contact with the contact portion 31b. In this case, the upper end of the contact portion 31b reaches almost the same height as the central position between the center and the lower end of the head 27b of the attachment screw 27. That is, the contact part 31b is opposed to the screw insertion hole 30a in the axial direction of the screw insertion hole 30a (the front-rear direction in FIG. 6).

  Further, a substantially arc-shaped recess 31c is formed at the center in the left-right direction at the upper end of the contact portion 31b. The distance A between the opening surface 26 a and the contact portion 31 b is set to be shorter than the total length B of the attachment screw 27. In this case, the abutting portion 31b does not hinder the insertion / extraction of the attachment screw 27 from the obliquely upper rear side with respect to the screw insertion hole 30a.

  A pair of left and right shaft portions 32 is provided at the front end of the lower end portion of the main body portion 29. Each shaft portion 32 extends along the left-right direction orthogonal to the vertical direction (up-down direction), and projects outward from the left and right ends of the main body portion 29. Each shaft portion 32 is provided so as to form a pair on both the left and right sides of the sensor accommodating portion 24 (see FIG. 3) of the carriage 16 (see FIG. 3) and is vertically long for passing the code plate 23a (see FIG. 3). The cover member 26 is rotatably supported with respect to the carriage 16 by being inserted into the respective slits 33 (see FIG. 3) so as to be rotatable from the inside of the sensor housing portion 24.

  Therefore, the cover member 26 has a closed position (attachment position; a position shown in FIG. 7) that closes the sensor housing portion 24 and an open position (non-attachment position) that opens the sensor housing portion 24 with each shaft portion 32 as the center. ; The position shown in FIG. 8). When the cover member 26 is rotated to the closed position, the screw insertion hole 30a and the screw hole 28a (see FIG. 3) of the female screw portion 28 overlap in the front-rear direction. In this state, the cover member 26 is attached (fixed) to the carriage 16 (see FIG. 7) by the attachment screw 27 by screwing the attachment screw 27 into the screw hole 28a while being inserted into the screw insertion hole 30a. Is done.

  As shown in FIG. 4, a rectangular plate-like handle for pinching the cover member 26 when rotating the cover member 26 between a closed position and an open position is provided at a substantially central portion of the rear surface of the main body 29 of the cover member 26. 34 protrudes rearward. Further, as shown in FIG. 6, a rectangular plate-like stopper 35 projects downwardly at a position slightly forward of the central portion in the left-right direction on the lower surface of the main body 29 of the cover member 26. As shown in FIG. 8, when the cover member 26 is rotated to the open position, the stopper 35 abuts on the carriage 16 to bring the cover member 26 into the open position (the cover member 26 is opened to the maximum extent). State).

In the present embodiment, the screw insertion hole 30a and the restricting portion 31 constitute a screw drop-off restricting structure.
Next, the operation at the time of replacement of the sensor 23b accommodated in the sensor accommodating portion 24 will be described.

  When replacing the sensor 23b accommodated in the sensor accommodating portion 24, first, a plus driver (not shown) is inserted into the cross hole of the head 27b of the attachment screw 27, and the plus driver is moved to the rear side. The attachment screw 27 is detached from the screw hole 28a of the female screw portion 28 by rotating counterclockwise as viewed from the top. At this time, since the concave portion 31c is formed in the contact portion 31b of the restricting portion 31, the contact portion 31b does not get in the way when the attachment screw 27 is rotated by a Phillips screwdriver.

  Further, at this time, the head 27b of the attachment screw 27 comes into contact with the contact portion 31b. In this state, the tip of the shaft 27a of the attachment screw 27 is in the screw insertion hole 30a. For this reason, the attachment screw 27 is supported from the lower side by the restricting portion 31 and the movement in the left-right direction and the rearward direction is restricted. Therefore, the attachment screw 27 may fall out of the screw insertion hole 30a. Be regulated.

  Subsequently, when the cover member 26 is rotated from the closed position to the open position, the stopper 35 comes into contact with the carriage 16 and the cover member 26 stops at the open position. At this time, even in the process in which the cover member 26 is rotated from the closed position to the open position, the mounting screw 27 is always supported from the lower side in the vertical direction (up and down direction) by the restricting portion 31. Is preferably restricted from falling out of the screw insertion hole 30a.

  When the cover member 26 is rotated to the open position, the screw tip 27c of the attachment screw 27 is directed upward, but in this state, the attachment screw 27 is lowered downward in the vertical direction by the restricting portion 31. Therefore, the attachment screw 27 is restricted from falling off from the screw insertion hole 30a. Subsequently, the two fixing screws 25 fixing the sensor 23b to the sensor housing portion 24 are removed with a Phillips screwdriver (not shown).

  At this time, even if the fixing screw 25 falls, the cover member 26 in the open position functions as a tray for the fixing screw 25, so that the fixing screw 25 can be received by the cover member 26. Further, since the cover member 26 in the open position is retracted from directly behind the sensor 23b, the cover member 26 does not hinder the replacement work of the sensor 23b. Then, after replacing the sensor 23b, the cover member 26 is rotated from the open position to the closed position, and the attachment screw 27 is inserted into the screw insertion hole 30a while being screwed into the screw hole 28a. The cover member 26 is attached to the carriage 16 by the attachment screw 27.

As described above, according to the embodiment described in detail, the following effects can be obtained.
(1) In the cover member 26, the restricting portion 31 is provided integrally with the main body portion 29 so as to face the screw insertion hole 30a in the axial direction of the screw insertion hole 30a. For this reason, even when a general-purpose attachment screw 27 is used, when the attachment screw 27 in a state where the shaft 27a is inserted into the screw insertion hole 30a is detached from the screw hole 28a of the female screw portion 28 of the carriage 16, The restriction portion 31 can suppress (restrict) the attachment screw 27 from falling out of the screw insertion hole 30a.

  (2) In the cover member 26, since the distance A from the contact portion 31b to the opening surface 26a is set to be shorter than the total length B of the attachment screw 27, the head 27b of the attachment screw 27 is applied. In the state of contacting the contact portion 31b, the tip of the shaft 27a of the attachment screw 27 is inserted into the screw insertion hole 30a. For this reason, it is possible to effectively suppress (restrict) the attachment screw 27 from falling out of the screw insertion hole 30a.

  (3) When the cover member 26 is rotated between the closed position and the open position, the mounting screw 27 is always supported from the lower side in the vertical direction by the restricting portion 31, and therefore the mounting screw 27 is It is possible to effectively suppress (restrict) the falling out of the screw insertion hole 30a.

(4) Normally, in a state where the cover member 26 is in the open position (opened to the maximum), the screw tip 27c of the attachment screw 27 faces upward, so that the attachment screw 27 is easily removed from the screw insertion hole 30a. Become. In this respect, in the present embodiment, since the attachment screw 27 is supported from the lower side by the restricting portion 31 even when the cover member 26 is in the open position, the attachment screw 27 is prevented from falling off from the screw insertion hole 30a. (Regulation).
(Example of change)
The above embodiment may be changed to another embodiment as described below.

In the state where the cover member 26 is in the open position, the screw tip 27c of the attachment screw 27 does not necessarily have to face upward.
In the cover member 26, the distance A from the contact portion 31 b to the opening surface 26 a is not necessarily set to be shorter than the total length B of the attachment screw 27.

  The cover member 26 may be attached to the carriage 16 so that each shaft portion 32 of the cover member 26 extends obliquely with respect to the horizontal plane. That is, the rotation axis of the cover member 26 may extend obliquely with respect to the horizontal plane.

  The cover member 26 may be configured to be removable while being completely separated from the carriage 16. That is, each shaft portion 32 of the cover member 26 may be omitted, and the cover member 26 may be configured to be detachable from the carriage 16 by the attachment screw 27.

The attachment member may be any member other than the cover member 26 as long as it is a member that is detachably attached to the carriage 16 with a screw.
The object may be any object other than the carriage 16 as long as an arbitrary attachment member can be attached detachably with a screw.

-You may comprise the control part 31 with elastomers, such as rubber | gum.
-You may comprise the control part 31 with a magnet. In this case, the mounting screw 27 is made of a material that is attracted to the magnet, and the magnetic force of the restricting portion 31 is such that the attaching screw 27 attracted to the restricting portion 31 can be easily removed by the operator. It is preferable to set. In this way, since the attachment screw 27 is attracted and held by the restricting portion 31 by the magnetic force, the attachment screw 27 can be more effectively suppressed (restricted) from falling out of the screw insertion hole 30a. Can do.

  -You may make it give adhesiveness to the contact surface with the attachment screw 27 in the control part 31. FIG. In this case, it is preferable to set the adhesive force of the restricting portion 31 to such an extent that the attaching screw 27 adhered to the restricting portion 31 can be easily removed by the operator. In this way, the attachment screw 27 is adhered and held by the restricting portion 31 by the adhesive force, so that the attachment screw 27 is more effectively suppressed (restricted) from falling out of the screw insertion hole 30a. be able to.

  In the above embodiment, the recording apparatus is embodied in the ink jet printer 11, but a liquid ejecting apparatus that ejects or ejects liquid other than ink may be employed. The present invention can be used for various liquid ejecting apparatuses including a liquid ejecting head that ejects a minute amount of liquid droplets. In addition, a droplet means the state of the liquid discharged from the said liquid ejecting apparatus, and shall also include what pulls a tail in granular shape, tear shape, and thread shape. The liquid here may be any material that can be ejected by the liquid ejecting apparatus. For example, it may be in a state in which the substance is in a liquid phase, such as a liquid with high or low viscosity, sol, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals (metal melts ) And a liquid as one state of a substance, as well as a material in which particles of a functional material made of a solid such as a pigment or metal particles are dissolved, dispersed or mixed in a solvent. Further, representative examples of the liquid include ink and liquid crystal as described in the above embodiment. Here, the ink includes general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot melt inks. As a specific example of the liquid ejecting apparatus, for example, a liquid containing a material such as an electrode material or a color material used for manufacturing a liquid crystal display, an EL (electroluminescence) display, a surface emitting display, or a color filter in a dispersed or dissolved form. It may be a liquid ejecting apparatus for ejecting, a liquid ejecting apparatus for ejecting a bio-organic material used for biochip manufacturing, a liquid ejecting apparatus for ejecting a liquid as a sample used as a precision pipette, a textile printing apparatus, a microdispenser, or the like. In addition, transparent resin liquids such as UV curable resin to form liquid injection devices that pinpoint lubricant oil onto precision machines such as watches and cameras, and micro hemispherical lenses (optical lenses) used in optical communication elements. A liquid ejecting apparatus that ejects a liquid onto the substrate or a liquid ejecting apparatus that ejects an etching solution such as an acid or an alkali to etch the substrate may be employed. The present invention can be applied to any one of these liquid ejecting apparatuses.

  DESCRIPTION OF SYMBOLS 11 ... Inkjet printer as recording apparatus, 16 ... Carriage as object, 26 ... Cover member as attachment member, 26a ... Opening surface, 27 ... Attachment screw as screw, 27a ... Shaft of attachment screw 27 27b: Head of the mounting screw 27, 27c: Screw tip of the mounting screw 27, 30a: Screw insertion hole constituting the screw dropout restricting structure, 31 ... Restricting portion constituting the screw dropout restricting structure, 31a ... Connection Part, 31b ... contact part, 32 ... shaft part of cover member 26.

Claims (5)

An attachment member configured to be movable between an attachment position attached to the object by a screw and a non-attachment position spaced apart from the attachment position, and the attachment member is attached to the object A screw insertion hole through which the shaft of the screw is inserted when attached by the screw;
A screw drop-out restricting structure comprising a restricting portion that restricts the screw in a state where the shaft is inserted into the screw insert hole from falling out of the object when the screw is detached from the object,
The screw insertion hole is provided in the attachment member so as to freely insert and remove the shaft of the screw.
The regulation part is
Provided integrally with the front Symbol securing member,
An abutting portion arranged to be able to abut the screw head in a state where the shaft is inserted into the screw insertion hole and to face the screw insertion hole;
A connecting portion for connecting the contact portion and an opening surface of the attachment member where the screw insertion hole is opened, below the screw insertion hole;
Coming off regulating structure of the screw, characterized in that it comprises a. Distance from previous SL abutment to said opening surface, falling off regulating structure of the screw according to claim 1, characterized in that it is set to be shorter than the total length of the screw.   The said attachment member is comprised so that rotation between the said attachment position and a non-attachment position is possible centering | focusing on the axial part extended in the direction which cross | intersects a perpendicular direction. Item 3. The screw drop-off regulation structure according to Item 2.   The said restricting part supports the said screw from the lower side in the vertical direction when the attachment member is rotated between the attachment position and the non-attachment position. Described screw fall-off restriction structure. The attachment member is constituted by a cover member that is attached to the object so as to be freely opened and closed,
The screw drop-off regulating structure according to claim 3 or 4, wherein a screw tip of the screw faces upward when the cover member is opened to the maximum.

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