JP2509932Y2 - Head position adjustment mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a head position adjusting mechanism, and more particularly to a head position adjusting mechanism in a printing apparatus in which a line head is arranged.

[Conventional technology]

Conventionally, in a printing apparatus in which a line head is arranged, the line head is positioned on a head base bracket by a spindle in both the main scanning direction and the sub-scanning direction and is swingably disposed. When adjusting the position in the scanning direction, loosen the fixing screw that secures the head base bracket to the main unit, shift the mounting position of the head base bracket in the main scanning direction and the sub scanning direction with respect to the main unit, and then This was done by re-fastening and fixing the head base bracket to the main body.

On the other hand, there has already been proposed an apparatus in which the position of the line head in the sub-scanning direction can be easily adjusted by a micro head arranged while urging the line head in the sub-scanning direction by a spring (Japanese Patent Laid-Open Publication No. Sho. 63-11
(See Japanese Patent No. 4664).

[Problems to be solved by the device]

In the above-described conventional head position adjusting mechanism, the position adjustment of the line head is performed by loosening the fixing screw of the head base bracket to which the line head is swingably attached, moving the head base bracket to the main body, and then refastening the fixing screw. Therefore, there are drawbacks that the position adjustment of the line head is troublesome and the fine adjustment is difficult. In particular, there is a problem that the position of the line head cannot be adjusted while printing.

On the other hand, in the device in which the position adjustment of the line head in the sub-scanning direction can be easily performed by the micro head, the position adjustment of the line head in the sub-scanning direction can be easily performed, but the position adjustment is performed only in the sub-scanning direction. There is a problem that adjustment cannot be performed. This is a particular problem in a printing apparatus in which a plurality of line heads are arranged in a staggered manner with respect to a platen roller, because the position adjustment in the main scanning direction between the line heads cannot be performed. .

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a head position adjusting mechanism capable of easily and finely adjusting the position of the line head in the main scanning direction and the sub scanning direction while printing in the printing apparatus.

[Means for solving the problem]

The head position adjusting mechanism of the present invention is, in a printing apparatus for arranging a line head, a main scanning direction adjusting screw pin that abuts an end surface of a spindle of the line head, and a moving direction of the spindle of the line head in a sub scanning direction. And a screw pin for adjusting the sub-scanning direction that is in contact with the side surface on the side.

[Action]

In the head position adjusting mechanism of the present invention, the main scanning direction adjusting screw pin abuts on the end face of the spindle of the line head, and the sub scanning direction adjusting screw pin is located on the side of the spindle of the line head in the moving direction of the sub scanning direction. Abut on the side.

〔Example〕

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

FIG. 1 and FIG. 2 are a side view and a bottom view of an essential part showing a printing apparatus in which a head position adjusting mechanism according to an embodiment of the present invention is arranged. This printing device is A0 size, A
This is a device for printing on a large size roll paper R such as 1 size, and it bridges between the two head bases 1 and the two head bases 1 which are arranged in parallel and are rectangular prisms. Four pairs of head base brackets 2 fixed to each other, four line thermal heads 3 mounted between each pair of head base brackets 2, and a platen roller 4 also serving as a feed roller with which the four line thermal heads 3 are in pressure contact. The main portion is composed of the platen roller 4 and two sub-rollers 5 that are in pressure contact with each other at a position opposite to the position where the line thermal head 2 is in pressure contact.

The line thermal head 3 is a plane type line thermal head, and the line thermal head 3 having a phase preceding in the sub-scanning direction and the line thermal head 3 having a phase following in the sub-scanning direction are arranged with respect to the platen roller 4. The corners and directions are staggered and arranged in a staggered pattern.

In this way, the plurality of line thermal heads 3 are arranged in a zigzag manner because one line thermal head 3 is A0 size, A
At present, there is no printable material over the entire width of a large-sized paper R such as 1 size, and if a plurality of line thermal heads 3 are arranged in a straight line, there will be portions that cannot be printed at both ends of each line thermal head 3. This is because things are taken into consideration.

As a result of arranging the plurality of line thermal heads 3 in a staggered manner by arranging them in different positions in the sub-scanning direction, the timing at which the print control information is given to the line thermal head 3 of the preceding phase in the sub-scanning direction and the position after the sub-scanning direction It goes without saying that it is necessary to shift the timing of giving the print control information to the line thermal head 3 of the phase to be performed by the phase difference.

Adjustment brackets 6 are screwed onto the outer surface of the head base bracket 2 with screws 7. Screw 7
2 are used to fix one adjustment bracket 6, one screw 7 is inserted into the long hole, and the other one screw 7 is the sub-scanning direction which is the feed direction of the paper R. It is inserted in the side notch.

The adjustment bracket 6 includes a main scanning direction adjustment screw pin 8
And a sub-scanning direction adjusting screw pin 9 is screwed on.

The main scanning direction adjusting screw pin 8 and the sub-scanning direction adjusting screw pin 9 have a screw portion at the upper end (see FIG. 1) and an eccentric pin portion at the lower end (see FIG. 1). The screw portion is fixed to the nut portion fixed to the adjustment bracket 6 so that the main scanning direction adjusting screw pin 8 and the sub scanning direction adjusting screw pin 9 are orthogonal to the spindle 3a of the line thermal head 3, respectively. It is screwed in. The eccentric pin portion of the main scanning direction adjusting screw pin 8 is in contact with the end surface of the spindle 3a of the line thermal head 3, respectively, as shown in FIG.
The eccentric pin portion of the sub-scanning direction adjusting screw pin 9 is in contact with the side surface of the spindle 3a of the line thermal head 3 on the advancing direction side in the sub-scanning direction. Therefore, if the screw portions of the main scanning direction adjusting screw pin 8 and the sub scanning direction adjusting screw pin 9 are rotated from above (as viewed in FIG. 1) by a screwdriver or the like, the eccentric pin portion is rotated and the eccentricity is increased. Bearing through hole 2a formed in the head base bracket 2 according to the amount of eccentricity of the pin portion.
The spindle 3a of the line thermal head 3 which is loosely fitted in (see FIG. 3) and protrudes from the bearing through hole 2a is displaced in the main scanning direction and the sub scanning direction.

As shown in FIG. 3, the spindle 3 a of the line thermal head 3 is planted on the head fixing studs 12 fixed to both ends of the line thermal head 3, and is planted on the inner surface of the head base bracket 2. The torsion spring 11 is wound around the pin 2b and has one end locked to the head base bracket 2.
Is biased by the other end so as to be biased in the sub-scanning direction.

Further, the line thermal head 3 is biased by a stretchable coil spring 14 whose one end is in contact with a spring mounting member 13 fixed to the head base 1, and the rotation of the line thermal head 3 due to this biasing force is Normally, the line thermal head 3 is received by pressing it against the platen roller 4. A regulation hole 12a is formed in the head fixing stud 12, and a regulation pin 15 fixedly implanted in the head base bracket 2 is loosely fitted in the regulation hole 12a. Line thermal head 3
Is regulated so as not to rotate more than necessary even by the extension elasticity of the coil spring 14.

Next, a method of adjusting the position of the line thermal head 3 by the head position adjusting mechanism of the present embodiment configured as described above will be described together with the operation of the printing apparatus.

When a printing operation is started by pressing a print switch (not shown) or the like, the platen roller 4 is rotated by the driving force from a driving source (not shown), the sheet R is fed, and the sub roller 5 is also driven. Rotate.

At the same time, the line thermal head 3 is driven based on the digital image information, and the paper R is sequentially printed. At this time, it goes without saying that the line thermal head 3 is driven in consideration of the phase difference based on the position difference in the sub-scanning direction.

If the alignment of the four line thermal heads 3 with each other (the alignment of each line thermal head 3 with respect to the platen roller 4) is not perfect and a deviation between the line thermal heads 3 occurs in the print result, main scanning is performed. By rotating the direction adjusting screw pin 8 and the sub-scanning direction adjusting screw pin 9, the position of the line thermal head 3 in the main scanning direction and the sub-scanning direction is adjusted.

When adjusting the position of the line thermal head 3 in the main scanning direction, the screw portions of the pair of main scanning direction adjusting screw pins 8 whose eccentric pin portions are in contact with the end surface of the support shaft 3a of the line thermal head 3 are screwed or the like. Rotate with. Then, the eccentric pin portion of the main scanning direction adjusting screw pin 8 rotates, and the support shaft 3a of the line thermal head 3 is displaced in the main scanning direction according to the amount of eccentricity of the eccentric pin portion. The position in the scanning direction is finely adjusted. Since the position of the line thermal head 3 in the main scanning direction is adjusted by changing the eccentric amount of the eccentric pin portion of the main scanning direction adjusting screw pin 8 according to the pitch of the screw portion, extremely accurate adjustment can be performed. it can.

Similarly, when the position of the line thermal head 3 in the sub-scanning direction is adjusted, a pair of sub-scanning directions in which the eccentric pin portions respectively contact the side surfaces of the support shaft 3a of the line thermal head 3 on the advancing direction side in the sub-scanning direction. The screw portion of the adjusting screw pin 9 is rotated by a screwdriver or the like. Then, the eccentric pin portion of the sub-scanning direction adjusting screw pin 9 rotates, and the support shaft 3a of the line thermal head 3 is displaced in the sub-scanning direction according to the amount of eccentricity of the eccentric pin portion. The position in the scanning direction is finely adjusted. The sub-scanning direction adjusting screw pin 9
Since the position of the line thermal head 3 in the sub-scanning direction is adjusted by changing the amount of eccentricity of the eccentric pin portion according to the pitch of the screw portion, extremely accurate adjustment can be performed.

FIGS. 4A and 4B are a side view and a bottom view showing a head position adjusting mechanism according to another embodiment of the present invention. The head position adjusting mechanism of this embodiment is arranged in a direction perpendicular to the spindle 3a of the line thermal head 3 in the main position adjusting mechanism of the embodiment shown in FIGS. Instead of the adjusting screw pin 8, a main scanning direction adjusting screw pin 8 ′ arranged in the same direction as the support shaft 3a of the line thermal head 3 is provided. Therefore, the members corresponding to the members in the head position adjusting mechanism of the embodiment shown in FIGS. 1 to 3 are designated by the same reference numerals and their detailed description is omitted.

The main scanning direction adjusting screw pin 8'has a screw portion at the outer end (to the line thermal head 3) and a contact pin portion at the inner end (to the line thermal head 3).
The screw portion is screwed into a nut portion fixed to the adjustment bracket 6 so that the main scanning direction adjusting screw pin 8'is in the same direction as the spindle 3a of the line thermal head 3. The contact pin portion of the main scanning direction adjusting screw pin 8 ′ is in contact with the end surface of the support shaft 3 a of the line thermal head 3. Therefore, if the screw portion of the main scanning direction adjusting screw pin 8'is rotated from the outside (relative to the line thermal head 3) by rotating the screw portion of the main scanning direction, the contact pin portion rotates and the contact pin portion advances and retreats. Depending on the amount, the spindle 3a of the line thermal head 3 which is loosely fitted in the bearing through hole 2a formed in the head base bracket 2 and protrudes from the bearing through hole 2a is displaced in the main scanning direction. .

In the head position adjusting mechanism of this embodiment, when the position adjustment of the line thermal head 3 in the main scanning direction is performed,
The screw parts of the pair of main scanning direction adjusting screw pins 8'where the contact pin parts are in contact with the end face of the spindle 3a of the line thermal head 3 are rotated by a screwdriver or the like. Then, the abutting pin portion of the main scanning direction adjusting screw pin 8'rotates, and the spindle of the line thermal head 3 is displaced in the main scanning direction according to the amount of advance / retreat of the abutting pin portion, and the line thermal head 3 The position in the main scanning direction is finely adjusted. The position of the line thermal head 3 in the main scanning direction is adjusted by changing the amount of advance / retreat of the abutting pin portion of the main scanning direction adjusting screw pin 8 ', so that extremely precise adjustment is performed. be able to.

In each of the above-mentioned embodiments, the sub-scanning direction adjusting screw pin 9 has the eccentric pin portion. However, the sub-scanning direction adjusting screw pin 9 also has the contact pin portion, and the line thermal head 3 has the same structure. You may make it contact with the side surface of the advancing direction side of a subscanning direction.

Further, although the case where the line head is the line thermal head 3 has been described, it goes without saying that the present invention can be similarly applied to other types of line heads.

[Effect of device]

As described above, according to the present invention, the main scanning direction adjusting screw pin and the sub-scanning direction adjusting screw pin that come into contact with the support shaft of the line head are provided. Position adjustment in the scanning direction and sub-scanning direction can be easily performed, so that the adjustment time can be shortened, and the line can be adjusted by moving the screw pitch of the main-scanning-direction adjusting screw pin and the sub-scanning-direction adjusting screw pin. Since the position of the head is adjusted, there is an effect that the position of the line head in the main scanning direction and the sub scanning direction can be finely adjusted with extremely high precision.

[Brief description of drawings]

FIG. 1 is a side view showing a printing apparatus provided with a head position adjusting mechanism according to an embodiment of the present invention, FIG. 2 is a bottom view of essential parts showing the printing apparatus shown in FIG. 1, and FIG. FIG. 4A and FIG. 4B are side views showing the head position adjusting mechanism according to another embodiment of the present invention and a bottom view of the main part of the head position adjusting mechanism. It is a figure. In the figure, 1 ... Head base, 2 ... Head base bracket,
2a …… Bearing through hole, 3 …… Line thermal head, 3a
…… Spindle, 4 …… Platen roller, 5 …… Sub roller,
6 ... Adjustment bracket, 7 ... Screw, 8, 8 '... Main scanning direction adjusting screw pin, 9 ... Sub scanning direction adjusting screw pin, 11 ... Torsion spring, 12 ... Head fixing stud , 12
a …… Regulation hole, 13 …… Spring mounting member, 14 …… Coil spring, 15 …… Regulation pin.

Claims (3)

(57) [Scope of utility model registration request] 1. A printer in which a line head is arranged, wherein a main scanning direction adjusting screw pin is in contact with an end surface of a support shaft of the line head, and a side surface of the support shaft of the line head on a traveling direction side in a sub scanning direction. A head position adjusting mechanism comprising: a screw pin for adjusting in the sub-scanning direction. 2. The main scanning direction adjusting screw pin is arranged in a direction orthogonal to the spindle of the line head, and has an eccentric pin portion that abuts an end surface of the spindle of the line head.
The sub-scanning direction adjusting screw pin has an eccentric pin portion arranged in a direction orthogonal to the support shaft of the line head and abutting on an end surface of the support shaft of the line head on the advancing direction side in the sub-scanning direction. The head position adjusting mechanism according to claim 1. 3. The main scanning direction adjusting screw pin is arranged in the same direction as the support shaft of the line head, and has a contact pin portion that is in contact with an end surface of the support shaft of the line head. The eccentric pin portion is disposed in a direction orthogonal to a support shaft of the line head, and has an eccentric pin portion that abuts an end surface of the support shaft of the line head on a traveling direction side in the sub-scanning direction. 1. Head position adjustment mechanism.