JP3386103B2 - Carriage for impact dot printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carriage for an impact dot printer provided with a mechanism suitable for adjusting a platen gap. 2. Description of the Related Art In a so-called impact dot type recording head for printing by hitting a wire to a recording medium via an ink ribbon, the gap between the recording head and a platen depends on the printing density and the like. It greatly affects the printing quality such as copying ability. For this reason, in this type of printer, it is necessary to precisely adjust the platen gap. For this adjustment, usually, a ribbon mask is pulled out and a gap gauge is inserted between the recording head and the platen. Then, adjustment is made so that an optimum gap is formed between them. [0004] However, such an adjusting method is not applicable to a method having a paper transport path for winding and printing a recording paper.
If the ribbon mask is provided with a paper rake guide in the carriage direction, the ribbon mask can be attached without removing the recording head after adjusting the platen gap.However, the paper transport path is flat like a flatbed printer In addition, not only must the ribbon mask be provided with a paper rake guide in the carriage direction and paper feed direction, but also after adjusting the platen gap, removing the recording head and attaching the ribbon mask, Depending on the position of the recording head and the gap between the positioning portions, there is a problem that the platen gap is deviated after the recording head is mounted. [0005] The present invention has been made in view of such a problem, and its object is to provide:
It is an object of the present invention to provide a new impact dot printer carriage in which a ribbon mask can be easily attached without removing a recording head after a platen gap adjustment. [0006] That is, the present invention provides a carriage for an impact dot printer which achieves the above object, and which is close to and away from a paper transport path .
Being guided by the first and second guide members disposed at the intermediate positions.
The recording head is used for recording on the recording paper of the platen.
Carriage for ink-pact dot printer to run
Wherein the carriage enables the first guide member.
A first member which is rotatably held and slides on the first guide member;
And the paper guide guided by the second guide member.
The second guide member is slidably held in a direction parallel to the feeding path.
And a second slider for holding the second slider.
Is a piece which can be inserted and removed so as to sandwich the second guide member.
And a turn urged to abut the second slider.
A moving piece is provided, and the recording head is
The distance between the platen and the paper transport surface of the platen can be changed.
Have been. With this configuration, after the platen gap is adjusted, one of the small pieces is removed from the sliding portion, and the carriage is rotated with the carriage guide member as a fulcrum, so that the carriage can be rotated between the platen and the platen. A ribbon mask is attached using the gap. [0008] Embodiments of the present invention will be described below. The drawings show an embodiment of the present invention. In FIG. 1, a carriage body 1 indicated by reference numeral 1 is formed as a member elongated in a direction substantially perpendicular to a paper transport path, and a first slider 2 and a second slider 3 are provided at both ends thereof. The carriage body 1 is configured to be able to stably travel in the print digit direction by slidably contacting the guide rod 11 and the guide plate 12 attached to the printer body. The above-mentioned first slider 2 is slidable in the axial direction of the guide rod 11, and
The slider 2 is formed in a cylindrical shape so as to be able to rotate around. A wire dot type recording head 13 is mounted on the back surface of the position where the slider 2 is disposed so as to face the platen 14. A pair of left and right support shafts 4, 4 projecting from the surface in a direction orthogonal to the paper transport path ,
Move the first slider 2 along the paper transport path.
The mask holder 15 is configured so that it can be mounted from the rear side through the brackets 16, 16.
The surface facing the recording head 13 has a locking portion 1 at its center.
7 and 17 are provided, where the ribbon mask 1 is provided.
8 can be mounted from the back side of the first slider 2 along the paper transport path. On the other hand, the second slider 3 provided at an end remote from the paper conveyance path is formed in a frame shape opened toward the other end, and includes a guide plate 12. 2 Tsunokata 6,7 is provided so as to sandwich the, one piece is constructed as a bridge piece 6 that can remove and reinstall from the open end, and the other piece 7 the pivoted times the inner back of the slider 3 A spring 8 acting on the tip of the moving piece 7
With this urging force, the guide plate 12 is sandwiched between the pieces 6 to stably maintain the posture of the carriage body 1 during traveling. Note that reference numeral 19 in FIG.
Shows a ribbon cartridge holder attached to the back surface of the first slider 2. In the embodiment configured as described above, in order to adjust the platen gap, first, the ribbon mask 18 fixed on the mask holder 15 is pulled out while sliding in a direction parallel to the paper conveyance path. And then
The eccentric guide rod 11 is rotated to maximize the gap between the platen 14 and the recording head 13 and, as shown in FIG. A gap gauge 20 having a thickness to which the guide rod 11 is inserted is inserted under the condition.
Rotate to adjust the platen gap correctly. After completing such adjustment, as shown in FIG. 3, the piece 6 inserted into the second slider 3 is pulled out from the opening end, and the carriage 1 is moved by the force of the spring 8. With the guide rod 11 as a fulcrum, it rotates clockwise in the figure corresponding to the thickness of the piece 6 to form a large gap with the paper transport path. And, in this wide open state,
Next, the mask holder 15 is pulled out from the support shafts 4 and 4 of the carriage main body 1 so as to be along the paper transport path, the ribbon mask 18 is mounted thereon, and the carriage main body 1 is mounted again. Finally, the piece 6 is inserted into the opening of the second slider 3, and the guide plate 12 is
And the rotating piece 7, as shown in FIG.
The carriage main body 1 is stably held by the guide rods 11 and the guide plates 12 while an appropriate platen gap is formed between the platen 14 and the recording head 13. As described above, according to the present invention, paper transport
The second slider located at a position away from the feed path
Insert a piece that is involved in the separation of the ridge from the paper transport path.
The ribbon mask and ribbon holder.
If it becomes necessary to remove the piece from the platen, simply remove the piece without removing the recording head.
The gap required for mounting can be formed, and it is also versatile
A piece is attached to the second slider portion of the carriage.
Only attached to the stationary, simply and without causing deviation in the platen gap after adjustment, attachment of required members
Etc. can be performed .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a carriage according to an embodiment of the present invention. FIG. 2 is a diagram showing an adjustment state of a platen gap. FIG. 3 is a diagram showing an assembled state of a ribbon mask after adjustment. FIG. 4 is a diagram showing a normal printing state. [Description of Signs] 1 Carriage main body 2, 3 Slider 6 Piece 7 Rotating piece 8 Spring 13 Recording head 15 Mask holder 18 Ribbon mask

Claims (1)

(57) [Claim 1] For recording and writing on a recording paper of a platen guided by first and second guide members disposed at a position close to and apart from a paper transport path. A carriage for an ink-pact dot printer that causes a recording head to travel, said carriage comprising: a first slider that rotatably holds said first guide member and slides on said first guide member; A second guide member which is guided by the second guide member and slidably holds the second guide member in a direction parallel to the paper conveying path.
The second slider includes a piece that can be inserted and removed so as to sandwich the second guide member, and a turning piece that is urged to abut the second slider. A carriage for an impact dot printer, wherein a distance between the recording head and a paper transport surface of the platen is changeable by inserting and removing the piece.