JP4652290B2 - Sag prevention mechanism for belt-shaped medium and image recording apparatus - Google Patents

Description

  The present invention relates to a belt-like medium sag prevention mechanism and an image recording apparatus, and more particularly to a belt-like medium sag prevention mechanism used in a thermal transfer image recording apparatus and an image recording apparatus using the same.

  An example of a conventional slack prevention mechanism for a belt-like medium is described in Patent Document 1. FIG. 10 shows the configuration, and in order to hold the ink sheet 26 wound around the tubular core 25, it is wound around reel shafts 29 and 30 disposed on both sides of the casing 27, respectively. Core guide members 21 and 22 are provided to guide and hold the inner diameter surfaces at both ends of the core 25.

JP 59-204584 (page 5-8, Fig. 3)

  In the above-described conventional belt-shaped medium sagging prevention mechanism, the brake pads 23 and 24 for applying back tension and the pressing spring 35 are provided outside the guide members 21 and 22, and the ink sheet width l There was a problem that it was difficult to reduce the size and weight of the device because the distance L between the cases became excessive. In such a configuration, it is necessary to load or remove the ink sheet 26 on the guide members 21 and 22 against the inferior force of the pressing spring 35 while holding the ink layer surface of the ink sheet 26 by hand. The operation of attaching and detaching the ink sheet 26 is troublesome.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a belt-medium sag prevention mechanism and an image recording which can reduce the size of the device and reduce the number of parts by disposing a brake mechanism indispensable to sag of the belt-like medium on the inner wall inside the roller shaft. To provide an apparatus.

  The slack preventing mechanism for a belt-shaped medium according to the present invention includes a roller shaft that transports the belt-shaped medium, and a brake mechanism that is disposed inside the roller shaft.

  The slack prevention mechanism of the belt-like medium according to the present invention is characterized in that the brake mechanism portion is disposed on an inner wall of an end portion of the roller shaft and applies a load from the inside of the roller shaft.

  Furthermore, the slack preventing mechanism for the belt-shaped medium according to the present invention includes a claw portion in which the brake mechanism portion is disposed on an inner wall of the roller shaft end portion and extends in a length direction of the supply roller, and a shaft with respect to the claw portion. And a non-rotating member arranged in a fixed state with a shaft having a diameter such that a load is applied to the outside from the center.

  Furthermore, the slack preventing mechanism for the belt-shaped medium according to the present invention is characterized in that the brake mechanism portion is disposed on the inner wall of the roller shaft end portion and is located on the same plane, and the shaft center with respect to the elastic deformation member. And a non-rotating member arranged in a fixed state with a shaft having a diameter such that a load is applied in the external direction.

  Furthermore, the slack prevention mechanism for the belt-like medium of the present invention is such that the brake mechanism portion applies a load from the axial center to the leaf spring disposed on the inner wall of the roller shaft end portion and the leaf spring. And a non-rotating member arranged in a fixed state having a shaft with a large diameter.

  Furthermore, the slack prevention mechanism for a belt-like medium according to the present invention is characterized in that the brake mechanism is used in an image recording apparatus.

  Furthermore, the image recording apparatus of the present invention includes a belt-like medium sag prevention mechanism including a roller shaft that transports the belt-like medium and a brake mechanism disposed inside the roller shaft.

  Furthermore, the image recording apparatus of the present invention is characterized in that the belt-like medium is a thermal transfer ink film.

  The present invention has an effect of downsizing the apparatus and reducing the number of parts by disposing a brake mechanism indispensable for preventing the slack of the belt-like medium on the inner wall inside the roller shaft.

  Next, an embodiment of the present invention will be described in detail with reference to the drawings.

  1A and 1B show a configuration of an embodiment of a sagging prevention mechanism according to the present invention, where FIG. 1A is a side view and FIG. 1B is a plan view. Referring to FIG. 1, the sagging prevention mechanism is a belt-like medium driving mechanism. In this embodiment, the belt-like medium is an ink film used for a thermal transfer image recording apparatus.

  The sagging prevention mechanism of this embodiment includes an ink film 1, a supply roller 2, and a take-up roller 3. The supply roller 2 is obtained by winding the ink film 1 around a hollow cylindrical winding core 7 that is a roller shaft, and the take-up roller 3 has an axial center around which the ink film is supplied from the supply roller 2. 1 is wound up. The ink film 1 is wound at both ends by a winding roller 3 and a supply roller 2. The take-up roller 3 is driven by a motor (not shown) via the take-up gear 4 and conveys the ink film 1 in the direction of arrow A (the direction of winding from the supply roller 2 to the take-up roller 3) during printing. . In this belt-like medium sagging prevention mechanism, the brake mechanism 5 is arranged on the inner wall of one end of the winding core 7 inside the paper feed roller 2 to apply a load in the radial direction inside the paper feed roller 2.

  2 is a perspective view for explaining a first embodiment of the brake mechanism section 5 according to the present invention, and FIG. 3 is a sectional view taken along line XX of FIG. Referring to FIGS. 2 and 3, the brake mechanism portion 5 a includes a claw-shaped claw portion 8 disposed at the inner wall end portion of the winding core 7 and extending in the length direction of the supply roller 2, and the claw portion 8 And a non-rotating member 6 arranged in a fixed state with a shaft having a diameter such that a load is applied in the radial direction. The claw portion 8 has a claw that extends from the inner wall of one end of the winding core 7 in the central axis direction, further extends in the length direction toward the inside of the winding core 7, and further has a tip extended in the central axis direction. The non-rotating member 6 includes a cylindrical portion 61 into which the claw portion 8 is fitted and a polygonal portion 62 fixed to a housing (not shown).

  FIG. 4 is a partial cross-sectional perspective view of a state in which the non-rotating member is incorporated in the first embodiment of the brake mechanism section, and FIG. 5 is a YY cross-sectional view of the first embodiment of the brake mechanism section.

  The above-described brake mechanism 5a is assembled and used as shown in FIGS. 4 and 5 during operation. At this time, since the non-rotating member 6 is fitted into the claw portion 8 of the winding core 7 from one end of the winding core 7, the claw portion 8 is elastically deformed. Generate a braking function in the direction of rotation. Thereby, sagging of the ink film 1 can be prevented.

  6 is a perspective view of the second embodiment of the brake mechanism unit 5 shown in FIG. 1, and FIG. 7 is a ZZ cross-section when a non-rotating member is inserted in FIG. 6 showing the second embodiment of the brake mechanism unit. FIG.

  In the first embodiment of the brake mechanism section 5 (brake mechanism section 5a), the claw-shaped claw section 8 inside the shaft of the supply roller 2 extends from the predetermined height of the inner wall in the length direction of the winding core 7. However, it is also possible to use the elastic deformation member 9 on the same surface as in the second embodiment (brake mechanism portion 5b) of the brake mechanism portion shown in FIGS. The elastic deformation member 9 of the brake mechanism portion 5b is a member inserted into the end portion of the winding core 7, and is a substantially semicircular member. By inserting the cylindrical portion 61 (FIG. 3) of the non-rotating member 6 into the substantially semicircular member, the substantially semicircular member is elastically deformed. A brake function in the direction of rotation 2 is generated. Thereby, the sagging of the ink film 1 can be prevented.

  If the elastically deformable member 9 is formed on the same surface as the end surface of the roller shaft of the supply roller 2 as in the second embodiment (brake mechanism portion 5b) of the brake mechanism portion, the effect is that manufacture is easy and inexpensive. is there.

  FIG. 8 is a partial cross-sectional perspective view of the third embodiment of the brake mechanism. As a method of applying a load in the radial direction, the same effect can be obtained by arranging the leaf spring 10 on the inner wall as in the third embodiment (brake mechanism portion 5c) of the brake mechanism portion shown in FIG. . In this way, the same effect can be obtained simply by attaching an inexpensive leaf spring 10.

  FIG. 9 is a configuration diagram of an embodiment of an image recording apparatus to which the sagging prevention mechanism of FIG. 1 is applied. Referring to FIG. 9, the print head 58 generates heat based on a print signal sent from the control unit 59, melts the thermal transfer ink film 50, and prints an image on a sheet 57 on the platen roller 56. The paper 57 is conveyed from the paper supply roller 54 toward the paper supply roller 55 along with printing. The thermal transfer ink film 50 is supplied from the film supply roller 51 as the printing progresses, and is taken up by the film take-up roller 53 via the print head 58. At this time, the brake mechanism 52 applies a load to the thermal transfer ink film 50 to stabilize the winding of the ink film 50.

  In the above description of the sagging prevention mechanism, the belt-like medium is a thermal transfer ink film. However, the sagging prevention mechanism works effectively if the belt-like medium other than the ink film is a photographic film, a recording film, or a photographic paper.

1 shows a configuration of an image recording apparatus according to the present invention, in which (a) is a side view and (b) is a plan view. It is a perspective view explaining 1st Embodiment of a brake mechanism part. It is XX sectional drawing of 1st Embodiment of a brake mechanism part. It is a partial cross section perspective view in the state where a non-rotating member in a 1st embodiment of a brake mechanism part was built. It is YY sectional drawing of 1st Embodiment of a brake mechanism part. It is a perspective view of 2nd Embodiment of a brake mechanism part. It is ZZ sectional drawing at the time of inserting a non-rotating member in Drawing 6 showing a 2nd embodiment of a brake mechanism part. It is a partial cross section perspective view of 3rd Embodiment of a brake mechanism part. It is a block diagram of an embodiment of an image recording apparatus to which a sagging prevention mechanism is applied. It is a figure explaining a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ink film 2 Supply roller 3 Winding roller 4 Winding gear 5, 5a, 5b, 5c Brake mechanism part 6 Non-rotating member 7 Winding core 8 Claw part 9 Elastic deformation member 10 Leaf spring

Claims (6)

A roller shaft for conveying the belt-shaped medium;
A brake mechanism disposed inside the roller shaft,
The brake mechanism is
A roller shaft side brake mechanism formed on the roller shaft;
A non-rotating member that has a shaft with a diameter such that a load is applied to the roller shaft side brake mechanism in an external direction from the shaft center, and is arranged in a fixed state at an end of the roller shaft ;
The belt shaft side brake mechanism is a claw portion that is disposed on an inner wall of an end portion of the roller shaft and extends in a length direction of the roller shaft . A roller shaft for conveying the belt-shaped medium;
A brake mechanism disposed inside the roller shaft,
The brake mechanism is
A roller shaft side brake mechanism formed on the roller shaft;
A non-rotating member that has a shaft with a diameter such that a load is applied to the roller shaft side brake mechanism in an external direction from the shaft center, and is arranged in a fixed state at an end of the roller shaft;
The roller shaft side brake mechanism is an elastically deformable member disposed on the inner wall of the end portion of the roller shaft and on the same plane as the end surface of the roller shaft. Prevention mechanism. A roller shaft for conveying the belt-shaped medium;
A brake mechanism disposed inside the roller shaft,
The brake mechanism is
A roller shaft side brake mechanism formed on the roller shaft;
A non-rotating member that has a shaft with a diameter such that a load is applied to the roller shaft side brake mechanism in an external direction from the shaft center, and is arranged in a fixed state at an end of the roller shaft;
The belt shaft side brake mechanism is a leaf spring disposed on an inner wall of an end portion of the roller shaft, and a slack preventing mechanism for a belt-like medium. The slack preventing mechanism for a belt-like medium according to any one of claims 1 to 3, wherein the brake mechanism is used in an image recording apparatus . An image recording apparatus comprising the belt-like medium sagging prevention mechanism according to claim 1. The image recording apparatus according to claim 5, wherein the belt-like medium is a thermal transfer ink film.

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