JPH0627424Y2 - Positioning device for recording head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a device for positioning a recording head of a printer for a recording device used in facsimiles, computers and the like.

[Conventional technology]

The recording device incorporates a chart block for holding the platen roller and a recording head having a printing element, and the recording head and the platen roller of the chart block have a structure capable of abutting or separating from each other. The head and platen roller that supports the paper for printing must always be set in the correct position.

For example, in the thermal transfer printer using the line thermal head shown in FIG. 4, after feeding the paper 3 to the platen roller 2 supported by the chart block 1 in the direction of the arrow, the line thermal head 4 is applied to the platen roller 2 by the head lifter 5. If the printing elements of the line thermal head 4 are not accurately in contact with each other on the diameter line of the platen roller 2 when they are brought into contact with each other, the printing density becomes thin or printing cannot be performed.

Therefore, conventionally, when the adjusting piece 6 is semi-fixed to the line thermal head 4 and the line thermal head 4 is suspended and mounted on the head lifter 5 of the printer, the optimum position of the line thermal head 4 is searched while observing the printing state. The method of positioning the line thermal head 4 by fixing the adjusting piece 6 to the printer body with the screw 7 or the like at the optimum position is generally adopted.

However, in such a positioning method, it takes time to adjust the position of the line thermal head 4, which causes a cost increase. In addition, when the line thermal head 4 is broken or damaged during use and needs to be replaced, it is necessary to adjust the position of the line thermal head 4 again. In some cases, it cannot be replaced on the spot. There were some drawbacks.

[Problems to be solved by the device]

In view of such conventional circumstances, the present invention provides a recording head positioning device that eliminates the complicated operation of adjusting the position of the recording head when mounting the recording head and can always hold the recording head and the platen roller in a fixed positional relationship. With the goal.

[Means for Solving the Problems]

The printer recording head positioning device of the present invention supports a platen roller between two parallel side plates and is orthogonal to the side plates, supplies a sheet to the platen roller through the two side plates, and a platen roller. In a printer having a recording head having a printing element provided adjacent to the roller, in which the recording head and the platen roller of the chart block can abut or separate from each other; A guide rail fixed to two side plates of the chart block parallel to the axis and having a plurality of grooves orthogonal to the direction of the central axis of the platen roller; and a center of the platen roller opposite to the platen roller with respect to the guide rail. A plurality of guides that project from the recording head at right angles to the axial direction and can be fitted into the grooves of the guide rail. When the printing element of the recording head and the platen roller are brought into contact with each other, the position of the guide piece on the recording head is set so that each guide piece fits and abuts the bottom of each groove of the guide rail. It is characterized by setting.

〔Example〕

A specific example of the present invention will be described with reference to FIGS.

The chart block 1 supported by the thermal transfer printer supports the platen roller 2 between two parallel side plates and is orthogonal to the side plates, and supplies the sheet 3 to the platen roller 2 through the space between the two side plates. A guide rail 8 is fixed to the two side plates on the sheet feeding side of the platen roller 2 in parallel with the platen roller 2. This guide rail 8
A groove 9 orthogonal to the axial direction is formed at two places. On the other hand, in the line thermal head 4 having a printing element suspended on the head lifter 5, the two guide pieces 10 are located on the opposite side of the guide rail 8 from the platen roller 2 and in the axial direction of the guide rail 8. It is projected so as to be orthogonal to. The two guide pieces 10 are adapted to be fitted in the corresponding grooves 9 of the guide rail 8 so that the printing elements of the line thermal head 4 come into contact with the platen roller 2 when they are fitted together. The position of the guide piece 10 on the position 4, that is, the distance between the printing element and the guide piece 10 is accurately set.

[Action]

After feeding the paper 3 to the platen roller 2 of the chart block 1, the chart block 1 is used as a fulcrum as shown in FIG.
When the line thermal head 4 is moved around 11 with respect to the line thermal head 4, the head lifter 5 suspending the line thermal head 4 moves in a direction away from the platen roller 2. When the platen roller 2 stops at a predetermined printing position, the head lifter 5 moves to the original position this time, and the line thermal head 4 comes into contact with the platen roller 2 as shown in FIG.

At this time, as shown in FIG. 3, the guide piece 10 fixed to the line thermal head 4 can be easily fitted into the groove 9 of the guide rail 8, so that the line thermal head 4 in the axial direction of the platen roller 2 can be easily moved. The position is set. However, at this time, the printing element often does not contact the platen roller 2 accurately. Then, when the platen roller 2 is further rotated in the feeding direction of the paper 3, the line thermal head 4 contacting the platen roller 2 is moved by the frictional force to move the guide piece.
Since 10 completely contacts the bottom of the groove 9 provided in the guide rail 8, the position of the line thermal head 4 in the direction orthogonal to the axial direction of the platen roller 2 is determined. That is, the printing element of the line thermal head 4 accurately contacts the platen roller 2. In this way, the position of the line thermal head 4 with respect to the platen roller 2 can be easily and accurately determined, and the printing element can be accurately brought into contact with the platen roller 2, so that proper printing can be performed.

An adjustment piece similar to the conventional one is fixed to the line thermal head 4, and the position of the line thermal head 4 with respect to the platen roller 2 is accurately determined as described above, and the line thermal head 5 is attached to the head lifter 5 with a screw or the like. 4 can also be fixed.

[Effect of device]

According to the present invention, the recording head and the platen roller can be always held in a fixed positional relationship without requiring a complicated adjustment operation when the recording head is attached, and assembling of the printer and replacement of the recording head are compared with the conventional one. And very easy to do.

[Brief description of drawings]

1 and 2 are schematic front views of a positioning device for a line thermal head according to the present invention, wherein FIG. 1 shows a state in which the line thermal head and the platen roller are separated from each other, and FIG.
The figure shows a state in which both are in contact. FIG. 3 is a schematic side view showing the relationship between guide rails and guide pieces of the line thermal head positioning device according to the present invention. FIG. 4 is a schematic front view of a conventional line thermal head positioning device. 1 …… Chat block 2 …… Platen roller 4 …… Line thermal head 5 …… Head lifter, 6 …… Adjustment piece 8 …… Guide rail, 9 …… Groove 10 …… Guide piece, 11 …… fulcrum

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Claims (1)

[Scope of utility model registration request] 1. A chart block for supporting a platen roller between two parallel side plates in a direction orthogonal to the side plates and supplying a sheet to the platen roller through the space between the two side plates, and provided adjacent to the platen roller. In a printer having a recording head having a printing element, in which the recording head and the platen roller of the chart block can abut or separate from each other; A guide rail fixed to the two side plates and having a plurality of grooves orthogonal to the direction of the central axis of the platen roller; and a side opposite to the platen roller with respect to the guide rail and orthogonal to the direction of the central axis of the platen roller. A printing element of the recording head, which comprises a plurality of guide pieces protruding from the recording head and capable of being fitted into the respective grooves of the guide rail. A recording head for a printer, characterized in that when the platen roller is brought into contact with the recording head, the position of the guide piece on the recording head is set to a position where each guide piece is fitted and brought into contact with the bottom of each groove of the guide rail. Positioning device.