JP3669849B2 - Roll paper holding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a roll paper holding device used in an image forming apparatus such as a copying machine, a facsimile, or a printer.
[0002]
[Prior art]
FIG. 7 shows an example of an image forming apparatus in which the roll paper holding device is used, and the outline thereof will be described. Reference numerals 50-1, 2, and 3 denote roll papers having a core in a hollow hole. These roll papers 50-1, 2, and 3 are roll paper holding devices 51- mounted in the image forming apparatus as in the present invention. 1, 2, 3, pulled out by the feed roller 52 at the time of image formation, cut to a predetermined length by the cutter 53, passed, and synchronized with the operation timing by the registration roller 54, the transfer unit The toner is transferred at 55, heat-fixed at the fixing unit 56, and discharged.
[0003]
In the roll paper holding device, a spool type device using a spool that holds the roll paper 50 over its entire width has been used, but recently a large-sized image forming apparatus has been used. Accordingly, there is a problem that the length of the roll paper exceeds 1 m, and it is difficult to load and unload the roll paper.
[0004]
In order to solve such a problem, it has been proposed that flanges are attached to both ends of roll paper instead of spools and the roll paper is held by this flange. As a roll paper holding device for that purpose, (1) There are those disclosed in Japanese Patent Publication No. 64-43048 and (2) Japanese Utility Model Publication No. 7-48598.
[0005]
8, 9, 10, and 11, (1) includes a cylindrical portion 62 having a plurality of slits 63 inserted into the center hole 61 of the roll paper 60, and a cylinder A support ring 64 having a flange that expands from one end of the portion 62, a nut 66 having an umbrella-shaped pressing surface 65 that abuts the inner peripheral edge of the open end of the cylindrical portion 62, and the nut 66 are coupled to the support ring 64. It has a screw 67. When the roll paper 60 is held, the screw 67 is rotated so that the open end of the cylindrical portion 62 is expanded by the umbrella-shaped pressing surface 65 and pressed against the inner surface of the roll paper 60.
[0006]
Further, (2) includes a main body member 72 that is inserted into the hollow hole 71 of the roll paper 70 and an auxiliary member 74 that is inserted into the through hole 73 of the main body member 72, and the arm member 75 projects from the main body member 72. In addition, the arm member 75 is provided with a protrusion 76 that protrudes toward the through hole 73, and a recess 78 is provided on the outer peripheral portion of the cylindrical member 77 of the auxiliary member 74. When holding the roll paper 70, by rotating the auxiliary member 74, the protrusion 76 of the arm member 75 is engaged with the recess 78 of the auxiliary member 74, and the arm member 75 is expanded on the main body member 72. Thus, the inner surface of the roll paper 70 is pressed (FIG. 11).
[0007]
[Problems to be solved by the invention]
However, in the case of (1), when the roll paper 60 is held, the screw 67 has to be rotated, which takes a lot of trouble, and the opening of the cylindrical portion 62 has a plurality of troubles. Since the slit 68 is provided, there is a problem that the strength is reduced. In the case of (2), since the pressing force by the arm member 75 is constant, for example, in the case of the roll paper 70 having a large diameter, the holding force is insufficient, and on the contrary, in the case of the roll paper 70 having a small diameter. In order to engage the protrusion 76 of the arm member 75 with the recess 78 of the auxiliary member 74, a large turning force is required, and a large gap 80 is formed between the arm members 75. Similarly, there is a problem that the strength is reduced.
[0008]
Accordingly, the present invention eliminates the problems of the conventional roll paper holding device as described above, and does not require much trouble when holding the roll paper, and the roll paper holding member is constituted by a plurality of members separated from each other. The strength of the roll paper holding member is not reduced, and the pressing force by the roll paper holding member can be made uniform according to the diameter of the roll paper. It is an object of the present invention to provide a roll paper holding device in which a member can be easily mounted on a roll paper.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 is inserted into a flange abutting on both ends of the roll paper and an opening of the roll paper projecting on the inner surface thereof. In a roll paper holding device having a holder having a supporting cylinder, a through hole is provided in the peripheral wall of the supporting cylinder, and a locking claw is disposed in the through hole so that the locking claw can be projected and retracted. A spring that applies pressure, a lock member that supports one end of the spring, and a spring support material that supports the other end are arranged, and the lock member, the spring support material, and the spring can slide in the expansion and contraction direction. An elastic arm whose tip is attached to the latching claw protrudes from the outer periphery of the spring support material, and the elastic arm is expanded by pressing the spring support material through the spring by the lock member. Press the locking claw against the inner surface of the roll paper and fix it. And it is characterized in and.
[0010]
According to the second aspect of the present invention, a convex portion is provided on one of the opposing surfaces of the flange and the lock member, and a guide concave portion is formed on the other side, and the guide concave portion rotates the lock member. When moved, the convex portion is configured to slide in the expansion and contraction direction of the spring.
[0011]
The invention according to claim 3 is characterized in that the rigidity of the attachment portion of the locking claw of the elastic arm is weaker than the rigidity of the other portion of the elastic arm.
[0012]
The invention according to claim 4 is characterized in that when the elastic arm is expanded, the attachment portion of the locking claw is angularly displaced in the direction in which the tip of the locking claw pulls the holder into the roll paper.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Reference numeral 1 denotes a roll paper. A flange 2 that abuts on both ends of the roll paper 1 and a support cylinder 3 that protrudes from the inner surface of the roll paper 1 and is rotatably inserted into the opening of the roll paper 1. The holder 4 has a plurality of through holes 6 (three in this embodiment) in the peripheral wall of the support cylinder 3 inside the top plate 5 of the support cylinder 3, and a locking claw 7 that can be projected and retracted in the support cylinder 3 is provided. A spring support member 10 having one end, a replaceable spring 8 that applies a pressing force to the spring support member 10 at one end, and a lock member 9 that supports the other end of the spring 8. The lock member 9 is slidably disposed in the expansion / contraction direction of the spring 8.
[0014]
As shown in FIG. 4, an elastic arm 11 protrudes from the outer periphery of the spring support member 10 at a position facing the locking claw 7, and the tip of the elastic support 11 is formed in an engagement groove 12 provided in the locking claw 7. The elastic arm 11 is formed with a notch groove 13 in the vicinity of the sliding fitting portion to make the rigidity of this part weaker than the rigidity of other parts. As shown in FIG. 4, a protrusion 18 is provided on the rear upper part of the locking claw 7. The top plate 5 is provided with a guide sleeve 19 on the outer periphery of which the center hole of the spring support member 10 is slidably fitted. The front end of the lock member 9 is slidably fitted on the inner periphery of the guide sleeve 19.
[0015]
As shown in FIGS. 2, 3, and 4, a convex portion 14 is fitted to the opposing surface of the flange 2 and the lock member 9, and in this embodiment, the convex portion 14 is fitted to the lock member 9 and the convex portion 14 is fitted to the flange 2. The concave portion 15 is formed by an L-shaped member 16 and is formed in a spiral shape. When the lock member 9 is rotated, the convex portion 14 is guided by the concave portion 15 and locked. The member 9 is configured to slide in the extending / contracting direction of the spring 8. As shown in FIGS. 2 and 3, stopper members 17 for the convex portions 14 are detachably provided at both end portions of the concave portion 15. In addition, the convex part 14 and the recessed part 15 may be provided in the flange 2 and the lock member 9 contrary to the above.
[0016]
In such a case, when the roll paper 1 is not attached, the holder 4 is in the state shown in the lower half of FIG. 4, and the lock member 9 is in the position shown by the chain line in FIG. The material 10 is not pressed by the spring 8, and the locking claw 7 is in the through hole 6 and does not protrude to the outside. When the roll paper 1 is mounted on the holder 4 in such a state, the support cylinder 3 is inserted into the openings at both ends of the roll paper 1 so that the flange 2 is brought into contact with both ends of the roll paper 1 and the lock member 9 is rotated. It is moved to the position shown by the solid line in FIG.
[0017]
As a result, the convex portion 14 of the lock member 9 advances while rotating along the spiral concave portion 15, and moves the lock member 9 to the position shown in the upper half of FIG. By this movement, the lock member 9 presses the elastic arm 11 via the spring 8 to advance the spring support member 10, expands the elastic arm 11 and presses the locking claw 7 against the inner surface of the roll paper 1. Thus, the latching claw 7 is fixed, whereby the attachment of the holder 4 to the roll paper 1 is completed.
[0018]
When the elastic arm 11 is expanded as described above, the locking claw 7 moves outward while the elastic arm 11 is deformed. If the relative positional relationship between the elastic arm 11 and the locking claw 7 does not change because it is not weaker, the locking claw 7 is inclined at an angle θ as shown in FIG. Since the point contact is made with the paper 1, there is a drawback that the restraining force is small and the deviation is likely to occur, and this tendency becomes remarkable particularly in the case of the large-diameter roll paper 1. In the present invention, as described above, the portion in the vicinity of the sliding fitting portion is weaker than the rigidity of the other portions, so that the bottom surface of the locking claw 7 is kept almost horizontal as shown in FIG. Since it moves as it is and comes into surface contact with the inner surface of the roll paper 1, the above disadvantages are less likely to occur and a large restraining force on the roll paper 1 is obtained.
[0019]
Further, since the protrusion 18 is provided on the rear upper part of the locking claw 7, the protrusion 18 of the locking claw 7 receives a rotational moment in the direction shown by the arrow in FIG. Is rotated about the notch groove 13 and its tip is angularly displaced to apply a pressing force to the locking claw 7, whereby the holder 4 is drawn into the roll paper 1, and the holder It is possible to prevent rattling from occurring when the 4 rises from the roll paper 1.
[0020]
As described above, the locking claws 7 move and are fixed until they are pressed against the inner surface of the roll paper 1, so that the locking claws 7 are almost fixed regardless of the diameter tolerance of the roll paper 1. A uniform applied pressure is applied, and the roll paper 1 is reliably fixed without causing rattling due to an uneven load. In addition, since the pressure can be easily changed by exchanging the spring 8, in the case of a light or small roll paper 1, a spring 8 with a small applied pressure is used in consideration of operability, and the reverse. In the case of a roll paper 1 that is heavy, large or large in diameter, it is possible to easily cope with it by using a spring 8 having a large pressing force in order to securely lock it. it can.
[0021]
When using such an apparatus, as shown in FIG. 1, it is detachably mounted on a pair of support shafts 22 rotatably attached to an image forming apparatus (not shown) via a bearing 21. The position is regulated so as not to be displaced in the axial direction by a regulating member 23 provided in the image forming apparatus.
[0022]
【The invention's effect】
This invention is as described above, and in the roll paper holding device, the invention according to claim 1 is provided with a through hole in the peripheral wall of the support cylinder, and the latching claw is disposed in the through hole so as to be able to protrude and support. A spring that applies a pressing force to the locking claw, a lock member that supports one end of the spring, and a spring support material that supports the other end are arranged in the cylinder. The lock member and the spring support material are springs. An elastic arm whose tip is attached to the latching claw is projected on the outer periphery of the spring support member, and is supported by the lock member via the spring. By pressing the elastic arm, the locking claw is pressed and fixed to the inner surface of the roll paper so that the roll paper holding member is constituted by a supporting cylinder and is constituted by a plurality of free members. Great strength is maintained without being By simply changing the spring, the pressing force applied to the roll paper by the locking claw can be made uniform according to the diameter of the roll paper. There is an effect that the mounting operation is easy.
[0023]
According to a second aspect of the present invention, a convex portion is provided on one of the opposing surfaces of the flange and the lock member, and a guide concave portion is provided on the other side, and the guide concave portion rotates the lock member. In this case, since the convex portion is configured to slide in the direction of expansion and contraction of the spring, there is an effect that the pressing force of the locking claw can be easily adjusted with a small force.
[0024]
In the invention according to claim 3, since the rigidity of the attachment portion of the latching claw of the elastic arm is made weaker than the rigidity of the other portion of the elastic arm, the latching claw makes surface contact with the inner surface of the roll paper. Such a tendency is given, and there is an effect that a large restraining force of the locking claw with respect to the roll paper can be obtained.
[0025]
In the invention according to claim 4, when the elastic arm is expanded, the attachment portion of the locking claw is angularly displaced in the direction in which the tip of the locking claw pulls the holder into the roll paper. As a result, the holder is pulled into the roll paper, and the holder is lifted from the roll paper to prevent rattling.
[Brief description of the drawings]
FIG. 1 is a perspective view of an embodiment of the present invention.
FIG. 2 is an exploded slope view of the above.
FIG. 3 is a front view of the holder.
4 is a cross-sectional view showing a state when the upper half of the holder is mounted on a roll paper, and a lower half is a state when the holder is not mounted. FIG.
FIG. 5 is an explanatory view showing a locked state when the elastic arm of the holder is expanded.
FIG. 6 is an explanatory view showing a locking state at the time of expansion of the elastic arm, which is different from the present invention.
FIG. 7 is a schematic diagram of an example of an image forming apparatus in which a roll paper holding device is used.
FIG. 8 is a cross-sectional view of an example of a conventional roll paper holding device of the same type as the present invention.
FIG. 9 is a sectional view of the other example.
FIG. 10 is a cross-sectional view of the main part when not mounted.
FIG. 11 is a cross-sectional view of the main part at the time of mounting.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roll paper 2 Flange 3 Support cylinder 4 Holder 5 Top plate 6 Through-hole 7 Locking claw 8 Spring 9 Lock member 10 Spring support material
11 Elastic arm 12 Engagement groove
13 Notch groove 14 Convex
15 Recess 16 L-shaped member
17 Stopper member 18 Protrusion
19 Guide sleeve

Claims (4)

In a roll paper holding device comprising a holder having a flange that contacts both ends of the roll paper and a support cylinder that is inserted into the opening of the roll paper that projects from the inner surface of the roll paper, a through hole is formed in the peripheral wall of the support cylinder. A locking claw for providing a pressing force to the locking claw, a lock member for supporting one end of the spring, and a spring for supporting the other end. A support member is disposed, and the lock member and the spring support member are slidable in the expansion and contraction direction of the spring, and an elastic arm whose tip is attached to the locking claw is provided on the outer periphery of the spring support member. A roll paper that is protruded and presses a spring support member through a spring by a lock member to expand the elastic arm and press and fix the locking claw to the inner surface of the roll paper Holding device. A convex portion is provided on one of the opposing surfaces of the flange and the lock member, and a guide concave portion in which the convex portion is fitted is provided on the other surface. When the guide concave portion rotates the lock member, the convex portion is a spring. The roll paper holding device according to claim 1, wherein the roll paper holding device is configured to slide in a telescopic direction. The roll paper holding device according to claim 1, wherein the rigidity of the attachment portion of the latching claw of the elastic arm is weaker than the rigidity of the other portion of the elastic arm. The roll paper holding device according to claim 3, wherein when the elastic arm is expanded, the attachment portion of the locking claw is angularly displaced in a direction in which a tip of the locking claw pulls the holder into the roll paper.

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