JPH081090Y2 - Line printer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line printer used as a label printer or the like.

[0002]

2. Description of the Related Art An apparatus proposed by the present applicant in Japanese Patent Application No. 2-86241 as a prior art of a line printer will be described with reference to FIGS. First, in the label printer 1 which is this line printer, as illustrated in FIG. 2, the printing mechanism 4 is covered with a maintenance cover 3 which is attached to the upper part of the main body housing 2 so as to be openable and closable. In the printing mechanism 4, as illustrated in FIG. 3, a platen roller 6 is rotatably supported in a main frame 5 formed in a U shape, and is located at a position facing the platen roller 6. The thermal type line head 7 is swingably supported via a support plate 8 which is a support mechanism. here,
The main frame 5 has screw holes 9 formed in the inner part thereof and projections 10 formed on the inner side surfaces of both sides thereof. The depressions at the end of the pressure plate 11 inserted under the projections 10 are formed. 12 is fastened with a screw 13 screwed into the screw hole 9. By doing so, the pressure plate 11 detachably attached to the main frame 5 is
The line head 7 is pressed and held on the peripheral surface of the platen roller 6 via the support plate 8.

With this structure, the label printer 1 prints on the label sheet (not shown) conveyed by the rotation of the platen roller 6 by the line head 3 to issue various labels.

In the label printer 1, for example, when a jam occurs during printing as described above, the maintenance cover 3 is opened to loosen the screw 13, and then the pressure plate 11 is pulled out. By doing so, the line head 7 pressed and held by the platen roller 6 is separated from the platen roller 6 by the elastic force of the pressure plate 11, so that it is possible to easily perform work such as jam processing.

[0005]

In the label printer 1 described above, the pressure plate 11 for pressing the line head 7 against the platen roller 6 is detachably attached to the main frame 5 by fastening the screw 13. Maintenance work such as jam handling is easy.

However, in the above-mentioned label printer 1,
Since the pressure plate 11 is fastened to the main frame 5 with the screw 13, a tool such as a screwdriver (not shown) is required to attach and detach the pressure plate 11, and the work is complicated. further,
Since the pressure plate 11 fastened to the main frame 5 with the single screw 13 is likely to rotate in the left-right direction about the screw 13, the pressing force on the line head 7 may be uneven on the left and right. In this case, the line head 7
The contact state between the platen roller 6 and the platen roller 6 becomes unstable, and the print quality deteriorates.

[0007]

A platen roller rotatably supported by a platen roller is provided with a support mechanism for supporting the line head in a contactable / separable manner, and the line head supported by the support mechanism is formed in a U-shape. A main frame having two engaging parts formed at a predetermined distance in the inner part and a holding part protruding from the inner side surfaces of the main frame, and the rear edge part at the engaging part of the main frame. And the both side edges are fitted to the holding portion, thereby forming a pressure plate for pressing and holding the line head against the platen roller.

[0008]

[Operation] A support mechanism swingably supports a line head at a position facing a platen roller rotatably supported,
A holding portion is provided so as to project on the inner side surfaces of both sides of the main frame formed in a U shape surrounding the line head, and two engaging portions are formed at a predetermined distance in the inner portion. The pressure plate with the rear edge abutting against the section and both side edges fitted into the holding section presses and holds the line head against the platen roller, so that the pressure plate can be manually operated without using a tool such as a driver. Since the position of the pressure plate held by fitting with the holding portion of the main frame in this way is restricted by the engagement with the two engaging portions of the main frame, The pressure plate is prevented from rotating in the left-right direction, and the pressing force on the line head is evenly maintained on the left and right.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG.
First, the label printer which is the line printer of this embodiment
The whole (not shown) is similar to the above-mentioned label printer 1. The printing mechanism 14 is provided on the inner side surfaces of both sides of the main frame 15 as shown in the drawing.
6 is provided protrudingly and two guide pins 17 which are engaging parts are attached to the inner part thereof, and the pressure plate 18 is provided with an inserting part 19 which is inserted between the guide pins 17 and engaged therewith. Fitting portions 20 that are formed at the rear edge portion and that fit into the holding portion 16 are formed at both side edge portions. Here, a protrusion 21 is provided on the holding portion 16 of the main frame 15 so as to protrude downward, and the engagement of the protrusion 21 causes the pressure plate 18 to have both side edges of the insertion portion 19 as the guides. The pin 17 is held by the main frame 15 while being in contact with the pin 17.

In such a structure, the label printer of this embodiment functions similarly to the above-mentioned label printer 1.

Here, in the label printer of this embodiment,
The pressure plate 18 is held by engaging the fitting portion 20 with the protrusion 21 of the holding portion 16 of the main frame 15, so that the pressure plate 18 can be manually attached and detached without using a tool such as a driver. As a result, it is possible to extremely easily perform work such as jam clearance.

Furthermore, in this label printer, the position of the pressure plate 18 held by the engagement of the holding portion 16 of the main frame 15 and the fitting portion 20 is such that the two guide pins 1 are located.
Since it is regulated by contact with 7, the pressure plate 18 is prevented from rotating in the left-right direction. Therefore, in this label printer, since the pressing force of the pressure plate 18 against the line head 7 is always equal on the left and right, the contact state between the line head 7 and the platen roller 6 is uniform and the printing quality is good.

In the label printer of this embodiment, the protrusion 21 of the holding portion 16 of the main frame 15 is formed by half-cutting, but this can also be formed by cutting and raising the main frame 15. . In the label printer of this embodiment, the guide pin 17 is used as the engaging portion of the main frame 15 that contacts the pressure plate 18 to regulate the direction, but the present invention is not limited to the above structure. This engaging portion can also be formed by cutting and raising the main frame 15 or the like.

[0014]

As described above, according to the present invention, the platen roller rotatably supported is provided with the support mechanism for supporting the line head in a contactable and separable manner, and the line head supported by the support mechanism is surrounded by the coil. The main frame is formed in the shape of a letter, the holding parts projecting from the inner side surfaces of both sides, and the two engaging parts are formed at a predetermined distance in the inner part. Since the rear edge portion abuts on the above-mentioned portion and both side edge portions are fitted to the holding portion to form a pressure plate for pressing and holding the line head against the platen roller, it is possible to perform the work manually without using a tool such as a driver. Since the pressure plate can be attached and detached, jamming and other work can be performed extremely easily. Furthermore, the position of the pressure plate held by fitting with the holding portion of the main frame in this way But, Since it is regulated by the engagement with the two engaging portions of the in-frame, the pressure plate is prevented from rotating in the left-right direction, and the pressing force on the line head is evenly maintained on the left and right sides. Since the contact state with the roller is always uniform, the printing quality is good.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional example.

FIG. 3 is an exploded perspective view.

[Explanation of symbols]

 6 Platen Roller 7 Line Head 8 Support Mechanism 15 Main Frame 16 Holding Section 17 Engaging Section 18 Pressurizing Plate

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Nio Shiozaki 6-78 Minamimachi, Mishima City, Shizuoka Prefecture Mishima Plant, Tokyo Electric Co., Ltd. (56) References JP-A-57-199677 (JP, A) JP-A-56 -154071 (JP, A) Actually open 63-170241 (JP, U) Actually open 3-64752 (JP, U) JIII Journal of Technical Disclosure No. 88-3362

Claims (1)

[Scope of utility model registration request] 1. A platen roller rotatably supported is provided with a support mechanism for supporting the line head so that the line head can be contacted and separated from the platen roller. A holding portion is provided on the inner side surface, and a main frame is formed in which two engaging portions are formed in the inner portion with a predetermined interval, and the rear edge portion abuts on the engaging portion of the main frame. A line printer, wherein both side edges are fitted to the holding part to form a pressure plate for pressing and holding the line head against the platen roller.