JPH09254489A - Fore and aft shifting mechanism of printing head in printing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shift fore and aft a printing head with a simple mechanism. SOLUTION: The printer carriage 14 is designed to include a main carriage 14a with a driving system 16 mounted thereon and a subcarriage system 14b with a printing system 17 mounted thereon, and the subcarriage 14b is installed to be shiftable fore and aft at only the printing height of a printing head 12 with respect to the main carriage 14a. A slide plate 23 is set on the main carriage 14a, which slides in the shifting direction of the printer carriage 14, and projects in its end part in a manner capable of being in contact with both the side walls of a base plate in the vicinity of the shifting end of the printer carriage 14, and a guide part is formed on the slide plate 23 aslant in the horizontal direction with respect to the shifting direction of the printer carriage 14, and then the guide part is engaged with a securing pin 27 fixed on the subcarriage 14b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a print head is moved back and forth within a certain range for printing, by moving back and forth by a print height of the head at a moving end of forward movement, and then moving back. The present invention relates to a mechanism that moves a print head back and forth in a printing device that prints twice as large.

[0002]

2. Description of the Related Art Generally, a check writer is provided with a type ring having numbers or symbols displayed on its outer peripheral surface. The type ring is rotated to select a predetermined number or symbol, and this is pressed against a check or bill on a platen. It is configured to launch.
Since the character of the type wheel and the platen that receives the character are respectively formed with corrugated corrugations, a three-dimensional scratched pattern appears on the paper surface of the check or bill due to the meshing of the corrugations during printing.

In such a printing method, there is a problem that the size and type of characters are fixed in addition to the need to adjust the combination of the concavities and convexities. Therefore, recently, a dot printer method has been used instead of the type wheel. Using the print head of
Attempts have been made to print dots and to engrave a scratch pattern.

[0004]

However, since the numbers of checks and bills are larger than the characters and numbers of ordinary printed documents, it is necessary to equip the print head with a specially large size than general-purpose ones. However, there is a problem that such a print head becomes expensive.

However, even with a general-purpose print head, when the print head is reciprocated, the upper half or the lower half of the numeral is printed during the forward movement, and the remaining half is printed during the backward movement. It is possible to print double the number printed.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a mechanism capable of moving a print head back and forth with a particularly simple mechanism.

[0007]

In order to solve the above-mentioned problems, a forward / backward moving mechanism of a print head in a printing apparatus according to the present invention is provided on a platen in the shape of an elongated plate provided on a base plate along its longitudinal direction. In a printing device for moving a printer carriage having a print head to print on a printing material arranged on the platen, the printer carriage is movably provided along a main shaft provided between both side walls of a base plate. The printer carriage includes a main carriage equipped with a drive system for moving the printer carriage and winding the ink ribbon, and a sub-carriage equipped with a printing system having a print head and an ink ribbon. Moves back and forth by the print height of the print head with respect to the main carriage Provided capacity, to the main carriage slides in the direction of movement of the printer carriage, the slide plate end portions on both side walls of the base plate is contactable with the protruding provided at the moving end near the printer carriage,
It is characterized in that a guide portion is formed on the slide plate in a horizontal direction with respect to the moving direction of the printer carriage, and a fixing pin fixed to the sub-carriage is engaged with the guide portion.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of a check writer.
Is provided, and the print-receiving material 3 (check, bill, etc.) is inserted between the main body 1 and the table 2, and the print-receiving material 4 is inserted through the print alignment window 4.
Is arranged on the platen, a predetermined amount of money is selected by the keyboard portion 6 of the main body 1, and after confirmation by the display portion 7, the printing device inside the main body 1 is operated to execute printing. .

As shown in FIG. 2, the table 2 is provided on a base plate 8. A rack member 11 is supported on both left and right side walls 9 of the base plate 8.

The printing apparatus includes a print head 12 and a platen 1
3 while moving along the longitudinal direction of the platen 13
The print head 12 is provided on the printer carriage 14, and the printer carriage 14 is a main shaft 15 supported between the side walls 9.
It is provided so that it can be moved left and right along. As will be described later, the printing is configured such that the printer carriage 14 reciprocates to print one line of numbers, characters and symbols.

By the way, as shown in FIGS. 3 and 4,
The printer carriage 14 includes a main carriage 14a having a drive system 16 mounted thereon and a sub-carriage 14b having a printing system 17 mounted thereon. The main carriage 14a is slidably held along the main shaft 15 in the left-right direction. The sub-carriage 14b is the main carriage 14
It is movably supported in the front-rear direction along a guide rail (not shown) provided in a. 3 shows the state in which the sub-carriage 14b has moved backward, and FIG. 4 shows the state in which the sub-carriage 14b has moved forward.

The drive system 16 is composed of a motor 18, gears 19 and 20 meshing with the rack member 11, an ink ribbon winding drive shaft 21, and gears linked to these. The printing system 17 is composed of a print head 12 and an ink ribbon cassette 22. Print head 1
The reference numeral 2 may be a general-purpose one that is used in a general word processor or a printer of a personal computer and has 12 pins in 1 row and 2 rows of pins.

The amount of movement of the sub-carriage 14b to the front is the print height (width corresponding to one pin of the print head 12).
Is equivalent to.

Next, a horizontal slide plate 23 is arranged on the main carriage 14a so as to be slidable in the moving direction of the printer carriage 14. Long slide holes 24 extending parallel to the moving direction of the printer carriage 14 are formed on both sides of the slide plate 23, and guide pins 25 fixed to the main carriage 14a are engaged with the slide holes 24. Slide plate 2
3 is a moving range until the guide pin 25 hits both ends of the slide hole 24. Further, the length of the slide plate 23 is formed to be longer than the width of the printer carriage 14, and moreover, the end portion of the slide plate 23 is brought into contact with the side wall 9 of the base plate 8 in the vicinity of the moving end of the printer carriage 14. It is configured. Therefore, while the printer carriage 14 is moving, the slide plate 23
One end of the printer carriage 14 protrudes from the outer surface of the printer carriage 14,
The other end is depressed, but the protruding end hits the side wall 9 in the vicinity of the moving end and is pushed in the opposite direction, and the other end projects.

Next, a guide hole 26 is formed in the central portion of the slide plate 23 so as to be inclined in the horizontal direction with respect to the moving direction of the printer carriage 14. A fixing pin 27 fixed to the sub-carriage 14b is engaged with the guide hole 26.

The guide portion for guiding the fixing pin 27 is not limited to the guide hole 26 described above. A groove-shaped guide groove may be used.

According to the above configuration, the printer carriage 1
When 4 is in the standby position at one end, one end 23a of the slide plate 23 contacts one side wall 9 of the base plate 8 and the other end 23b projects, as shown in FIG. 6 (a). When printing is started in this state, as shown in FIG. 1, the gears 19, 20 meshing with the rack member 11 by the motor 18 are shown.
When the printer rotates, the printer carriage 14 moves forward along the main shaft 15. During the forward movement of the printer carriage 14, before reaching the moving end, the print head 12 prints the upper half of the selected number on the predetermined position of the printing target material 3 (see FIG. 5A). When the printer carriage 14 reaches the vicinity of its moving end, the protruding end 23b of the slide plate 23 hits the other side wall 9 of the base plate 8 as shown in FIG. 6B, so that the printer carriage 14 moves further. Accordingly, the slide plate 23 is pushed in and slides in the direction opposite to the moving direction, and the end portion 23a on the opposite side projects. When the slide plate 23 slides, the central diagonal guide hole 26 also moves in the same direction, so that the fixing pin 27 engaged with the diagonal guide hole 26 is pushed forward. Therefore, the fixing pin 27
The sub-carriage 14b integrated with the main carriage 14
It moves forward with respect to a as shown in the figure. After that, when the printer carriage 14 further returns, the print head 1
2 prints the lower half of the above number (Fig. 5
(b)). In this way, the printer carriage 14
Printing is completed for the first time by the reciprocating motion of. The printed number is enlarged to twice the printing height determined by the print head 12. Then, at the returning end, the end of the slide plate 23 again hits the side wall 9 and slides in the opposite direction, and this slide pulls the sub-carriage 14b back again (to the main carriage 14a side) as shown in FIG. 6 (a). ,
The standby state is entered and the next print is prepared.

The mechanism for moving the print head 12 back and forth is as follows.
The heavy drive system 16 and the light print system 17 are arranged on separate carriages 14a and 14b, and the fixing pin 27 on the print system 17 side is engaged with the oblique guide hole 26 of the slide plate 23 provided on the drive system 16 side. With this simple mechanism, the slide plate 23 hits the side wall 9 of the base plate 8 to move the carriage on the side of the light printing system 17 back and forth, so that the carriage can be reliably moved without requiring special power. The cost can be kept low.

[Brief description of drawings]

FIG. 1 is a perspective view of a check writer including a printing device according to the present invention.

FIG. 2 is a perspective view showing an outline of a printing device.

FIG. 3 is a perspective view showing a state in which the sub-carriage has moved rearward with respect to the main carriage.

FIG. 4 is a perspective view of a state in which the sub-carriage has moved forward with respect to the main carriage.

5 (a) and 5 (b) are explanatory views of printing modes when the printer carriage is moving forward and backward, respectively.

FIG. 6 is an explanatory diagram of a front-back movement mode of a printer carriage.

[Explanation of symbols]

 3 Printed Material 8 Base Plate 9 Side Wall 12 Print Head 13 Platen 14 Printer Carriage 14a Main Carriage 14b Sub Carriage 15 Main Shaft 16 Drive System 17 Printing System 23 Slide Plate 26 Guide Hole (Guide) 27 Fixing Pin

Claims (1)

[Claims] 1. A printer for moving a printer carriage having a print head along a longitudinal direction of an elongated plate-shaped platen provided on a base plate to print on a material to be printed arranged on the platen, A printer carriage is provided so as to be movable along a main shaft provided between both side walls of the base plate. The printer carriage includes a main carriage equipped with a drive system for moving the printer carriage and winding the ink ribbon, and printing. A sub-carriage equipped with a print system having a head and an ink ribbon is provided, and the sub-carriage is provided so as to be movable back and forth by the print height of the print head with respect to the main carriage. Slide in the direction to move the printer carriage. Provided on both side walls of the base plate in the vicinity of the moving end are slide plates protruding so that the ends can come into contact with each other, and the slide plate is provided with a guide portion that is oblique to the moving direction of the printer carriage in the horizontal direction. Is a mechanism for moving a print head back and forth in a printing apparatus, wherein a fixing pin fixed to a sub-carriage is engaged.