JP2013124141A - Roll holding member and image recording apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll holding member capable of preventing damage and unrolling even when a width of a medium to be recorded is increased, and also facilitating handling, and to provide an image recording apparatus using the same.SOLUTION: A roll holding member 5 for holding a roll body configured by winding a medium to be recorded around a hollow shaft part includes an abutment member 8 which can be displaced in a radial direction in accordance with an inside diameter of the hollow shaft part and which abuts on an inner peripheral surface of the hollow shaft part, a flange 7 which has a guide surface for guiding an end surface of the roll body, and a stopper 8c which moves between a position on the radial inside of the hollow shaft part and a position protruding to the radial outside from the hollow shaft part on a guide surface in such a manner as to interlock with a radial displacement of the abutment member 8.

Description

  The present invention relates to a roll holding member that holds a roll body made of a recording medium, and an image recording apparatus including the roll holding member.

  2. Description of the Related Art Conventionally, image recording apparatuses such as printers, copiers, and facsimiles have a configuration in which a recording head records an image on a recording medium supplied from a paper feeding unit based on image data. In particular, many image recording apparatuses for producing a large-sized recorded matter use a roll body configured by winding a long recording medium.

  A paper feed unit that holds a roll body and feeds out a recording medium from the roll body has a pipe shaft extending over the entire width of the recording medium and a hollow spool shaft into which the pipe shaft is inserted. Yes. A guide member having a flange portion is attached to one end of the pipe shaft and a position of the spool shaft on the other end side of the pipe shaft. When the recording medium is wound around and the spool shaft and the pipe shaft are inserted into the hollow shaft portion (paper tube) located at the center of the roll body, the end surface of the roll body is sandwiched between both flange portions. It is held in a rotatable state. In order to stably hold the roll body, it is preferable that the outer diameter of the insertion portion of the guide member inserted into the paper tube matches the inner diameter of the paper tube. Since the inner diameter of the paper tube located at the center of the roll body is not always constant, multiple guide members with different outer diameters of the insertion part are prepared and used selectively, or another part is attached to the insertion part. The diameter of the paper tube is increased to cope with changes in the inner diameter of the paper tube.

  Usually, the guide member attached to one end of the pipe shaft serves as a reference for positioning the roll body, and the guide surface of the flange portion abuts on the end surface of the roll body for guidance. Thus, the roll body is positioned, and the recording medium is prevented from being unwound from the roll body by the frictional force between the guide surface and the end face of the roll body. On the other hand, the flange portion of the guide member that is attached to the spool shaft and is located on the other end side of the pipe shaft has a guide surface that abuts against an end surface of the roll body and a flange portion that does not abut.

  Generally, the width of a recording medium that is thin and has low rigidity may increase due to temperature, humidity, or the like. If both ends of the roll body are in contact with the guide surface of the flange portion, when the width of the recording medium is widened, there is no escape, and the recording medium is easily damaged. In particular, the recording medium is easily affected by temperature, humidity, and the like on the outer peripheral side of the roll body, and the width is increased and is easily damaged. Therefore, the guide surface of the flange portion of the guide member attached to the spool shaft is positioned so as not to contact the end surface of the roll body, thereby providing a space for a clearance area where the width of the recording medium is widened. This prevents damage to the recording medium.

  On the other hand, a thick recording medium with high rigidity is likely to unwind from the roll body. In order to record a good image on the recording medium, it is necessary to reduce the tension of the recording medium as much as possible to suppress slippage with respect to the transport mechanism. However, when the tension is reduced, unwinding from the roll body occurs in a recording medium that is thick and has high rigidity. Therefore, the guide surface of the flange portion of the guide member attached to the spool shaft is brought into contact with the end surface of the roll body, and the recording medium from the roll body is caused by the frictional force between the guide surface and the end surface of the roll body. Unwinding is suppressed.

  As described above, there is an image recording apparatus provided with a switching mechanism for bringing the guide surface of the flange portion and the end surface of the roll body into contact with or apart from each other (see Patent Document 1). According to this, before the roll body is mounted on the image recording apparatus, the guide surface of the flange portion and the end surface of the roll body are brought into contact with each other, and when the roll body is mounted on the image recording apparatus, the guide surface and the end surface of the roll body are Can be separated.

JP 2009-83964

  In the configuration described above, the pipe shaft is inserted into the hollow spool shaft. When the width of the recording medium is large, a long pipe shaft must be inserted into the long spool shaft, which is troublesome. Therefore, a configuration is considered in which a short roll holding member serving also as a guide member having the above-described configuration is attached to both ends of the roll body, and the long pipe shaft and spool shaft are eliminated. Thus, in the case of a configuration in which a short roll holding member is attached to both ends of the roll body, if the configuration of the roll holding member is different at both ends (the reference side of positioning of the roll body and the opposite side), the user mistakenly Each roll holding member may be attached in the opposite direction. Therefore, it is preferable that the roll holding members attached to both ends have the same shape and the same configuration.

  In addition, when a different roll holding member is used according to the size of the inner diameter of the paper tube of the roll body, or when a separate part is attached to the insertion portion, the operability of setting the roll body is deteriorated. Accordingly, there is a demand for improvement in the operability of switching between contact and separation between the guide surface and the end surface of the roll body, and to cope with a change in the inner diameter of the paper tube of the roll body.

  SUMMARY OF THE INVENTION In view of the above problems, the present invention prevents a roll from being damaged even when the width of a recording medium is increased, can suppress unwinding from a roll body, and is easy to handle. And an image recording apparatus including the same.

  The roll holding member for holding the roll body in which the recording medium is wound around the hollow shaft portion of the present invention can be displaced in the radial direction in accordance with the inner diameter of the hollow shaft portion. The radial direction of the hollow shaft portion on the guide surface in conjunction with the radial displacement of the contact member, the flange portion having a guide surface for guiding the end surface of the roll body, and the radial displacement of the contact member And a stopper that moves between an inner position and a position protruding radially outward from the hollow shaft portion.

  The stopper moves to a position projecting radially outward from the hollow shaft portion in conjunction with the radially inward displacement of the contact member, and the stopper of the hollow shaft portion is interlocked with the radially outward displacement of the contact member. It may move to a radially inner position. This stopper may be provided on the contact member.

  The roll holding member further includes an insertion portion inserted into the hollow shaft portion and a rotation cam provided with a rotation groove portion, and a notch portion is provided on the outer peripheral portion of the insertion portion. The contact member has a protruding portion that slidably engages with the rotating groove portion, and is rotatably attached to the notch portion of the insertion portion, and is rotated inside the rotating groove portion of the protruding portion by the rotation of the rotating cam. The abutting member rotates simultaneously with the sliding of the stopper between the position where the stopper is accommodated inside the notch and the position outside the notch and outside the outer periphery of the insertion part. It may be configured to move.

  An image recording apparatus according to the present invention records an image on a roll holding member having the above-described configuration, a transport unit for transporting a recording medium fed from a roll body, and a recording medium transported by the transport unit. And two roll holding members having the same shape and configuration are attached to both ends of the hollow shaft portion, respectively.

  According to the present invention, there is no pipe shaft and spool shaft extending over the entire width of the recording medium, and the roll body can be held only by a pair of short roll holding members, so that the configuration is simple and the operability is good. Furthermore, by making the pair of roll holding members both have the same shape and configuration, there are no restrictions on attachment, and the user's attachment work is facilitated. In addition, handling of changes in the inner diameter of the hollow shaft portion of the roll body and operability of switching between contact and separation between the guide surface and the end surface of the roll body are improved.

1 is a schematic cross-sectional view schematically illustrating an ink jet printer that is an embodiment of an image recording apparatus including a roll holding member of the present invention. FIG. 2 is a perspective view of the image recording apparatus shown in FIG. 1 as viewed from the sheet feeding unit side. It is a perspective view which shows the holding state of the roll body by a roll holding member. It is a perspective view which shows the roll holding member of this invention. It is a disassembled perspective view of the roll holding member shown in FIG. (A) is a top view which shows the state in which the circle | round | yen which a some contact member forms of the roll holding member shown in FIG. 4 has a small diameter, (B) is the side view. (A) is a plane sectional view showing a state where the roll holding member shown in FIG. 6 is mounted on a roll body including a small-diameter hollow shaft portion, and (B) is a sectional view taken along line AA. (A) is a top view which shows the state where the circle which the some contact member forms of the roll holding member shown in FIG. 4 has a large diameter, (B) is the side view. (A) is a plane sectional view showing a state where the roll holding member shown in FIG. 8 is mounted on a roll body including a large-diameter hollow shaft portion, and (B) is a sectional view taken along line BB.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show an ink jet printer which is an embodiment of an image recording apparatus 100 provided with a roll holding member of the present invention. The image recording apparatus 100 is an apparatus that records an image on a recording medium 101 ′ fed out from a roll body 101, and includes a recording head 1, a transport mechanism 2, a platen 3, a paper feed unit 4, and the like. . In this image recording apparatus 100, the recording medium 101 ′ is sequentially fed out from a roll body 101 that is rotatably held by a pair of roll holding members 5 of the paper feed unit 4, and directed toward the recording head 1 by the transport mechanism 2. Are sent. Ink is ejected from the recording head 1 onto the recording medium 101 ′ that is fed and positioned between the recording head 1 and the platen 3 to record an image. The recording medium 101 ′ on which an image is recorded is cut as necessary, further conveyed, and discharged from the image recording apparatus 100.

  The recording head 1 serving as a recording unit records an image on a recording medium 101 ′ based on image information. In the case of an ink jet printer, the recording head 1 performs recording by appropriately ejecting ink from a plurality of ejection ports onto a recording medium 101 ′ based on image information. The recording medium 101 ′ used in the image recording apparatus 100 may be made of various materials capable of image recording, such as paper including photographic printing paper, resin sheets, and leather.

  Next, the configuration of the roll holding member 5 will be described with reference to FIGS. A roll holding member 5 shown in FIGS. 3 and 4 holds a roll body 101 formed by winding a recording medium 101 ′ around a hollow shaft portion (paper tube) 102. The roll holding member 5 has a substantially cylindrical insertion portion 6 that is inserted into the paper tube 102 from the end of the roll body 101, and a bottomed cylindrical flange portion 7. The flange portion 7 includes a disc portion 7b including a guide surface 7a facing the end surface of the roll body 101, and an annular frame portion 7c extending perpendicularly to the guide surface 7a from the outer peripheral edge of the disc portion 7b to the side opposite to the guide surface 7a. And have. A plurality of cutout portions 6a are provided on the outer peripheral portion of the insertion portion 6, and contact members 8 that contact the inner peripheral surface of the paper tube 102 are rotatably attached to the cutout portions 6a. . And the disc part 7b of the flange part 7 is provided with the recessed part 7d connected to the notch part 6a of the insertion part 6. FIG.

  As shown in FIG. 5, inside the roll holding member 5, there are a disk-shaped fixing member 9 that supports the rotating shaft 8 a of the contact member 8, and a rotatable disk for rotating the contact member 8. The rotating cams 10 are arranged so as to overlap each other. The fixed member 9 and the rotary cam 10 are provided with a fixed groove portion 9a and a rotary groove portion 10a at positions facing each other. Then, the protrusion 8b of the contact member 8 is slidably engaged with the fixed groove 9a of the fixed member 9 and the rotary groove 10a of the rotary cam 10, and the contact member 8 causes the rotating shaft 8a to be moved by the fixed member 9. It is held rotatably as a center. Further, the contact member 8 includes a stopper 8c that is a stepped portion for separating the guide surface 7a and the end surface of the roll body 101 from each other. The contact member 8 rotates around the rotation shaft 8a when the protrusion 8b slides in the fixed groove 9a and the rotation groove 10a in a state where the rotation shaft 8a is supported by the fixed member 9. By this rotation, the stopper 8c provided in the contact portion 8 is positioned outside the insertion portion 6 on the guide surface (see FIG. 4), and the stopper 8c is in the notch portion 6a of the insertion portion 6. The state of being housed and not projecting to the outside of the insertion portion 6 is switched. This means that the contact part 8 is substantially displaceable in the radial direction. The notch 6 a of the insertion portion 6 is formed in a shape that can accommodate the stopper 8 c that has moved to the inner peripheral side by the rotation of the contact member 8.

  The fixing member 9 and the rotating cam 10 are covered and held by a cover 11 inside the annular frame portion 7 c of the flange portion 7. However, a handle 10 b provided on the rotating cam 10 for manually rotating the rotating cam 10 protrudes outside the cover 11. A slit (not shown) is provided on the side surface of the cover 11 so that the handle 10b can be moved by a predetermined range.

  The roll body 101 can be held by the roll holding member 5 by inserting the insertion portion 6 into the paper tube 102 of the roll body 101 and bringing the contact member 8 into contact with the inner peripheral surface of the paper tube 102. .

  Next, a series of operations for holding the roll body 101 by mounting the roll holding member 5 on the roll body 101 will be described with reference to FIGS. 6 to 9, the cover 11 is not shown in order to facilitate understanding of the configuration of the roll holding member 5.

  The diameter of the paper tube 102, which is the hollow shaft portion of the roll body 101, varies depending on the type of the recording medium 101 '. In general, since the recording medium 101 'which is thin and has low rigidity is not easily curled, a small diameter paper tube 102a with good space efficiency is used. Further, since the recording medium 101 ′ having a large thickness and high rigidity is likely to be curled, a large-diameter paper tube 102 b that can be bent is used. It is necessary to displace the contact member 8 of the roll holding member 5 in the radial direction in accordance with the inner diameter of the paper tube 102.

  First, a series of operations for mounting the roll holding member 5 on the small-diameter paper tube 102a will be described with reference to FIGS.

  As shown in FIGS. 6A and 6B, the rotating cam 10 is rotated clockwise, and the protrusion 8b of the contact member 8 is positioned on the inner peripheral side of the rotating groove 10a of the rotating cam 10. When in contact, the abutting member 8 is in a radially inner position within the plug-in portion 6. That is, the distance from the center of the insertion portion 6 (the radius of the circle formed by the plurality of contact members 8) of the plurality of contact members 8 is small. Moreover, the stopper 8c of the contact member 8 protrudes radially outward from the outer periphery of the insertion portion 6 on the guide surface 7a. In this state, as shown in FIGS. 7A and 7B, the insertion portion 6 is inserted into the small diameter paper tube 102a. When the insertion portion 6 is inserted into the small diameter paper tube 102a, the end surface of the paper tube 102a comes into contact with the stopper 8c, and the position of the roll body 101a in the width direction is determined. Since the stopper 8c is in a position protruding radially outward from the outer periphery of the insertion portion 6 (and the inner periphery of the paper tube 102a) on the guide surface 7a and abuts against the end surface of the paper tube 102a, the guide surface 7a and the roll body The end surface of 101a is separated and a space 103 exists between both surfaces. The plurality of abutting members 8 abut against the inner peripheral surface of the small diameter paper tube 102a, and the roll holding member 5 holds the roll body 101a including the small diameter paper tube 102a.

  As a result, even if the width of the thin recording medium 101 ′, which has low rigidity and is likely to be damaged, is increased due to temperature, humidity, or the like, the space 103 becomes a refuge for the recording medium 101 ′. Damage to the recording medium 101 ′ can be prevented. Since the thin recording medium 101 ′ is less likely to unwind from the roll body 101 a, misalignment due to unwinding is less likely to occur even if the guide surface 7 a is not brought into contact with the end surface of the roll body 101 a.

  In this manner, the roll holding member 5 can be attached to both ends of the roll body 101a having the small diameter paper tube 102a to hold the roll body 101a.

  Next, a series of operations for attaching the roll holding member 5 to the large diameter paper tube 102b will be described with reference to FIGS.

  When the rotary cam 10 is rotated counterclockwise from the state shown in FIGS. 6A and 6B, the abutment member 8 rotates about the rotary shaft 8a, and the projection 8b is rotated by the rotary cam 10. The sliding groove 10a is guided and slid. As a result, as shown in FIGS. 8A and 8B, the protrusion 8b is positioned on the outer peripheral side of the rotating groove 10a. That is, the distance from the center of the insertion portion 6 (the radius of the circle formed by the plurality of contact members 8) of the plurality of contact members 8 is increased. Further, when the rotary cam 10 rotates, the protrusion 8b slides in the rotary groove 10a while the contact member 8 rotates about the rotary shaft 8a. As a result, as shown in FIGS. 9A and 9B, the stopper 8c of the contact member 8 moves inward in the radial direction and is accommodated in the notch 6a of the insertion portion 6 on the guide surface 7a. Is done. That is, the stopper 8c does not protrude radially outward from the outer periphery of the insertion portion 6 (positioned radially inside the paper tube 102b). In this state, the insertion portion 6 is inserted into the hollow portion of the large diameter paper tube 102b. When the insertion portion 6 is inserted into the large diameter paper tube 102b, the end surface of the paper tube 102b contacts the guide surface 7a without contacting the stopper 8c, and the position of the roll body 101b in the width direction is determined. Therefore, the end surface of the roll body 101b is in contact with the guide surface 7a. The plurality of abutting members 8 abut against the inner peripheral surface of the large diameter paper tube 102b, and the roll holding member 5 holds the roll body 101b including the large diameter paper tube 102b.

  As a result, even if the recording medium 101 ′ has a large rigidity and is likely to be unwound, the end surface of the roll body 101b comes into contact with the guide surface 7a, and therefore the frictional force between the guide surface 7a and the end surface of the roll body 101b. Thus, unwinding can be suppressed. Further, the roll body 101b can be positioned reliably. Since the thick recording medium 101 ′ is unlikely to be damaged such as bending, even if the end surface of the roll body 101b and the guide surface 7a are brought into contact with each other, damage due to an increase in the width of the recording medium 101 ′ is unlikely to occur. .

  In this way, the roll holding member 5 can be attached to both ends of the roll body 101b having the large-diameter paper tube 102b to hold the roll body 101b.

  As described above, in the present embodiment, with respect to the roll body 101a configured by winding the thin recording medium 101 ′ around the small-diameter paper tube 102a, the contact member 8 is placed radially inward of the insertion portion 6. It is positioned and brought into contact with the inner peripheral surface of the small diameter paper tube 102a. In this way, the roll body 101 a is held by the roll holding member 5. In the present embodiment, the contact member 8 has the protrusion 8 b that engages with the rotation groove 10 a of the rotary cam 10, and can rotate about the rotation shaft 8 a supported by the fixed member 9. Therefore, in conjunction with the displacement of the contact member 8 radially inward of the insertion portion 6, the position where the stopper 8c protrudes radially outward from the outer periphery of the insertion portion 6 (and the outer periphery of the paper tube 102a). To move the guide surface 7a away from the end surface of the roll body 101a. As a result, even if the thin recording medium 101 ′ wound around the small-diameter paper tube 102 a extends, the extended portion can escape to the space 103 and damage can be prevented.

  On the other hand, with respect to the roll body 101b configured by winding a thick recording medium 101 ′ around a large diameter paper tube 102b, the contact member 8 is displaced radially outward of the insertion portion 6 to increase the diameter of the paper tube. The roll body 101b is held in contact with the inner peripheral surface of 102b. Then, in conjunction with the displacement of the abutting member 8 outward in the radial direction of the insertion portion 6, the position where the stopper 8 c does not protrude outward in the radial direction from the outer periphery of the insertion portion 6 (on the inner periphery of the paper tube 102 b). It moves radially inside and is accommodated in the notch 6a. Accordingly, the guide surface 7a and the end surface of the roll body 101b come into contact with each other. As a result, the unwinding of the recording medium 101 ′ from the roll body 101 b can be prevented by the frictional force between the guide surface 7 a and the end face of the roll body 101 b.

  The inventor of the present invention paid attention to the situation in which a thin recording medium 101 'is usually wound around a small diameter paper tube 102a and a thick recording medium 101' is wound around a large diameter paper tube 102b. In the present embodiment, in view of the situation, a change in radius of a circle formed by the plurality of contact members 8 and a radially outer side of the outer periphery of the insertion portion 6 (and the inner periphery of the paper tube 102) of the stopper 8c. The switching between the protrusion and the backward movement can be performed simultaneously. In particular, by supporting the contact member 8 in a rotatable manner and by engaging the protrusion 8b of the contact member 8 with the rotation groove 10a of the rotary cam 10 slidably, The above-described change in diameter can be linked with the switching of the protrusion and retraction of the stopper 8c.

  Further, the roll holding member 5 having the same shape and configuration is attached to both end portions of the roll body 101, so that it is not necessary to confirm the attachment position and the operation can be facilitated.

  In this embodiment, two types of roll bodies are held: a roll body 101a including a paper tube 102a having a predetermined inner diameter, and a roll body 101b including a paper tube 102b having a predetermined inner diameter larger than the inner diameter of the paper tube 102a. The mechanism for doing so has been described. If the paper tube 102 having an inner diameter larger than the inner diameter of the paper tube 102b and smaller than the inner diameter of the paper tube 102b is used, the rotation angle of the rotating cam 10 in the clockwise direction or the counterclockwise direction is adjusted. The abutting member 8 may abut on the inner peripheral surface of the paper tube 102. In that case, the stopper 8c protrudes radially outward of the outer periphery of the insertion portion 6 (and the inner periphery of the paper tube), and there is a high possibility that a space 103 is formed between the guide surface 7a and the end surface of the roll body 101. However, the inner diameter of the paper tube 102 is close to the inner diameter of the small-diameter paper tube 102a, and the stopper 8c is positioned on the radially inner side of the outer periphery of the insertion portion 6 (and the inner periphery of the paper tube 102). You may contact | abut with the end surface of the roll body 101. FIG.

DESCRIPTION OF SYMBOLS 1 Recording head 5 Roll holding member 6 Insertion part 6a Notch part 7 Flange part 7a Guide surface 8 Contact member 8a Rotating shaft 8b Projection part 8c Stopper (step part)
DESCRIPTION OF SYMBOLS 10 Rotating cam 10a Rotating groove part 100 Image recording apparatus 101 Roll body 101a Roll body 101b which consists of a thin recording medium Roll body 101 'which consists of a thick recording medium Recording medium 102 Paper tube (hollow shaft part)
102a small diameter paper tube 102b large diameter paper tube

Claims (5)

A roll holding member for holding a roll body in which a recording medium is wound around a hollow shaft portion,
An abutting member that is displaceable in a radial direction according to the inner diameter of the hollow shaft portion and abuts against an inner peripheral surface of the hollow shaft portion;
A flange portion having a guide surface for guiding an end surface of the roll body;
A stopper that moves between a radially inner position of the hollow shaft portion and a position protruding radially outward from the hollow shaft portion on the guide surface in conjunction with the radial displacement of the contact member; A roll holding member.   The stopper moves to a position projecting radially outward from the hollow shaft portion in conjunction with the radially inward displacement of the contact member, and interlocked with the radially outward displacement of the contact member. The roll holding member according to claim 1, wherein the roll holding member moves to a radially inner position of the hollow shaft portion.   The roll holding member according to claim 1, wherein the stopper is provided on the contact member. An insertion part inserted into the hollow shaft part, and a rotation cam provided with a rotation groove part;
A cutout portion is provided in the outer peripheral portion of the insertion portion,
The abutting member has a protrusion that slidably engages with the rotating groove, and is rotatably attached to the notch of the insertion portion,
The rotation of the rotating cam causes the abutting member to rotate simultaneously with the sliding of the protrusion in the rotating groove, and the position where the stopper is accommodated in the notch, and the notch. The roll holding member according to claim 3, wherein the roll holding member moves between a position outside the notch and outside the outer periphery of the insertion portion. 5. The roll holding member according to claim 1, a transport unit for transporting the recording medium fed from the roll body, and an image on the recording medium transported by the transport unit A recording head for recording
An image recording apparatus in which two roll holding members having the same shape and configuration are respectively attached to both end portions of the hollow shaft portion.

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