JPS63134274A - Thermal head supporter - Google Patents

Abstract

PURPOSE:To remove troublesomeness in maintenance control by providing a support member and a head holder that relatively approach to and recede from a platen, forming a U-shaped notch in the end portion of the head holder and providing the support member with a stopper. CONSTITUTION:A U-shaped notch 9 is open toward the side of a platen 2 in a condition that a thermal head 7 is brought into contact with the platen 2, and a stopper 13 blocks the receding action of a head holder 8 from the platen 2. In a condition that a support member 4 is withdrawn from the platen 2 with a pivot 5 as its center, the notch 9 can be taken off from a fulcrum shaft 6 without interfering the stopper 13 by rotating the head holder 8 with the fulcrum shaft 6 as the fulcrum by approximately 90 degrees. Consequently, since the mounting and dismounting operations of the head holder 8 to and from the support member 4, respectively, can be easily conducted without using a tool, and troublesomeness in maintenance control can be removed.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a thermal head support device.

BACKGROUND ART Conventionally, as shown in FIG. 4, a head holder 33 holding a thermal head 32 facing a platen 31 is rotatably attached to a frame 35 or the like by a fulcrum shaft 34, and recording paper is set. In such a case, there is a thermal head support means that allows the head holder 33 to rotate upward about the fulcrum shaft 34.

Problems to be Solved by the Invention On the other hand, the thermal head 32 requires regular maintenance such as cleaning, replacement, and inspection because the heat generating part gets dirty and wears out. Using the fulcrum shaft 3
The head holder 33 cannot be removed unless the fulcrum shaft 34 is removed after disassembling the axial retaining means 4. Therefore, maintenance management is troublesome.

Means for Solving the Problems A support member that approaches and separates from the platen relatively, and a head holder holding a thermal head that comes into contact with the platen are provided, and cylindrical holders are provided on both sides of the support member. When a fulcrum shaft is provided upright and the thermal head is in contact with the platen, the thermal head is held in a direction substantially parallel to the direction of contact between the two, opens toward the platen, and is rotatably held by the fulcrum shaft. A U-shaped notch is formed on both sides of the end of the head holder, and an arc surface on a radius centered on the fulcrum shaft is formed on both sides of the end of the head holder, and the head is disposed close to the arc surface. A stopper that interferes with the movement of the holder away from the platen is provided on a side surface of the support member.

Therefore, when the thermal head is in contact with the platen, the U-shaped notch opens toward the platen, but the stopper prevents the head holder from moving away from the platen. When the support member is separated from the platen, by rotating the head holder approximately 90 degrees about the fulcrum shaft, it is possible to remove the notch from the fulcrum shaft without interfering with the stopper.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. The frame of the printer (not shown) includes a holding part (not shown) that holds the recording paper l wound into a roll, and a bearing that rotatably holds the shaft 1%ls3 protruding from both ends of the platen 2. (not shown) and a support shaft 5 that rotatably holds the support member 4 with an axis parallel to the axis of the platen 2. A cylindrical fulcrum shaft 6 is erected on both inner surfaces of the support member 4.Furthermore, on both sides of the head holder 7 to which the thermal head 3 is fixed, a U-shaped notch 9 and a fulcrum shaft 6 are provided with a radial radius. An arcuate surface 10 having the center thereof is formed. The head holder 8 is biased by a spring 12 held by a protruding piece 11 at the tip of the support member 4, so that the thermal head 7 is elastically brought into contact with the platen 2. As shown in FIG. 1, when the thermal head 7 is in contact with the platen 2, the notch 9 is parallel to the direction of contact between the platen 2 and the thermal head 7, and is open on the platen 2 side. Stoppers 13 are erected on both inner surfaces of the support member 4 so as to approach the arcuate surface 10 and interfere with the movement of the head holder 8 away from the platen 2 .

Furthermore, support member 4. A U-shaped bearing portion 14 that is fitted onto the shaft portion 3 of the platen 2 is formed in the platen 2 .

In such a configuration, as shown in FIG. 1, the head holder 8 is biased by the spring 12, and the thermal head 7
presses the recording paper 1 against the platen 2.

Printing is performed in this state. In this state, the notch 9 is parallel to the direction of contact between the platen 2 and the thermal head 7 and opens toward the platen 2. Therefore, if we only look at the relationship between the fulcrum shaft 6 and the notch 9, we can move the head holder 8 from the fulcrum shaft 6. Although the direction in which the head holder 8 can be removed is limited to the upward direction away from the platen 2, the stopper 13 prevents the head holder 8 from moving away from the platen 2.

During maintenance and inspection, as shown in FIG. 2, with the support member 4 separated from the platen 2 using the support shaft 5 as a fulcrum, the head holder 8 is rotated approximately 90 degrees from the state shown by the solid line to the state shown by the imaginary line. The head holder 8 is separated from the support member 4 by rotating to change the direction of the notch 9 and then moving the head holder 8 toward the bearing portion 14 . therefore,
The work of attaching and detaching the head holder 8 to the support member 4 can be carried out extremely easily without using any tools.

Effects of the Invention Since the present invention is configured as described above, the head holder can be held rotatably by the engagement between the notch and the fulcrum shaft, and the stopper can prevent the head holder from falling off. Furthermore, when the support member of the head holder is separated from the platen, by rotating the head holder approximately 90 degrees about the fulcrum shaft, the head holder can be pulled out from the fulcrum shaft without interfering with the stopper. Therefore, it is possible to extremely easily attach and detach the head holder to and from the support member without using any tools.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the present invention, in which FIG. 1 is a vertical side view, FIG. 2 is a vertical side view showing the separation operation of the head holder, and FIG. 3 is a support for the head holder. FIG. 4 is a side view showing a part of the structure in an enlarged manner, and FIG. 4 is a vertical side view showing a conventional example.

Claims (1)

[Claims] A support member that approaches and separates from the platen relatively, and a head holder holding a thermal head that comes into contact with the platen are provided, a cylindrical fulcrum shaft is erected on both sides of the support member, and the When the thermal head is in contact with the platen, the head holder includes a U-shaped notch that is substantially parallel to the direction of contact between the two, opens toward the platen, and is rotatably held on the fulcrum shaft. is formed on both sides of the end of the head holder, and an arcuate surface on a radius centered on the fulcrum axis is formed on both sides of the end of the head holder, and the head holder moves away from the platen by approaching the arcuate surface. A thermal head support device characterized in that a stopper that interferes with the support member is provided on a side surface of the support member.