JPH0617947U - Serial printer - Google Patents

Abstract

(57) [Summary] [Purpose] To realize stable paper feed for printing paper of various thicknesses. [Structure] Paper chute 6 and paper pan 9 with slider 20 that works in conjunction with eccentric bush 4 that adjusts the distance between platen 5 and print head 1 according to the paper thickness of the print paper.
Adjust and set the interval according to the paper thickness of printing paper 2. As a result, it is possible to realize stable sheet feeding for the printing sheets 2 having various thicknesses.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a serial printer in which a distance between a first paper guide member and a second paper guide member for guiding a printing paper to a platen can be adjusted.

[0002]

[Prior art]

 Conventionally, in a serial printer, for example, a wire dot printer, a paper guide member that guides the print paper to a platen that supplies and conveys the print paper to a print position facing the print head is usually fixedly supported by the frame of the printer body. ing. FIG. 3 shows an example of the printer.

In FIG. 3, reference numeral 1 denotes a print head which is movable in a horizontal direction and prints on a print sheet 2. The print head 1 is mounted on a carriage (not shown) movably held on a rail 3. Further, the rail 3 is fixed to an eccentric bush 4 having an eccentricity from the center of the rail 3. Further, the eccentric bush 4 is configured so as to be interlocked with a lever (not shown) provided on the frame of the printer main body so that the rotation amount of the lever is transmitted and the eccentric bush 4 rotates in the forward and reverse directions of the arrow A direction. When the eccentric bush 4 is rotated, the rail 3 is eccentrically rotated, so that the print head 1 comes into contact with and separates from the platen 5 arranged in parallel to the moving direction of the print head 1. Move in the direction of arrow B. In other words, by rotating and operating the lever according to the paper thickness of the print paper 2, it is possible to set and adjust the print head 1 to a position where optimum print quality is obtained according to the paper thickness.

Further, the platen 5 winds the printing paper 2 and rotates in the direction of arrow C, and supplies and conveys the printing paper 2 to the printing position. A paper chute 6 for guiding the printing paper 2 is arranged below the platen 5, and the paper chute 6 is fed from the manual paper feed guide portion 6a for guiding the manually fed paper 2 and the tractor 7. Continuous paper guide portions 6b for guiding the continuous paper 2 to be printed are formed. A hole for projecting a part of the first roller 8 is formed on the downstream side of the manual paper guide portion 6a, and the manual paper 2 is pressed against the platen 5 by the projecting portion of the first roller 8 and the platen 5 is pressed. Along with the rotation of 5, the paper is guided and guided by the manual paper guide 6a.

Further, below the paper chute 6, a first guide portion 9a that forms and conveys the continuous paper 2 by forming a conveying path for the continuous paper 2 facing the continuous paper guide portion 6b, and a platen 5 are provided. A paper pan 9 having a second guide portion 9b facing the lower peripheral surface of the manual sheet 2 or the continuous paper 2 along the peripheral surface of the platen 5 is provided. A hole for projecting a part of the second roller 10 is formed on the downstream side of the paper pan 9, that is, on the front end side of the second guide portion 9b. The continuous paper 2 that has passed through the gap formed by the continuous paper guide portion 6b and the first guide portion 9a is pressed against the platen 5 by the protruding portion of the second roller 10 and is moved to the printing position as the platen 5 rotates. Be transported.

Further, both the paper chute 6 and the paper pan 9 described above are fixed to the frame of the printer body, and the distance between the conveyance paths formed by the continuous paper guide portion 6b and the first guide portion 9a is constant. Is set to.

[0007]

[Problems to be solved by the device]

 However, in the above-mentioned printer, the interval formed by the continuous paper guide portion 6b of the paper chute 6 and the first guide portion 9a of the paper pan 9 that has a great influence on the paper feeding accuracy of the print paper 2 is constant. Since the thickness of the printing paper 2 used is normally 0.06 mm to 0.4 mm because it is set, if the interval is too narrow for the thickness of the printing paper 2, that is, if the thick printing paper 2 is used. When transporting, if the printing paper 2 cannot pass through and jams occur, or if the spacing is too wide for the thickness of the printing paper 2, that is, when printing a thin printing paper 2, the paper feed accuracy However, there is a problem that

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a serial printer provided with a mechanism that realizes stable paper feeding for printing papers having various thicknesses.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a serial printer equipped with an adjusting mechanism for adjusting the distance between the platen and the print head according to the thickness of the printing paper. Paper guide member, a second paper guide member that forms a conveyance path for the print paper facing the first paper guide member, and swings the print paper into the platen, and the adjustment described above. It is characterized by comprising an adjusting mechanism for moving the second paper guide member up and down in cooperation with the mechanism to adjust the distance between the first paper guide member and the second paper guide member.

[0010]

[Action]

 Since the present invention is configured as described above, the gap between the first paper guide member and the second paper guide member is linked with the adjusting mechanism that adjusts the space between the platen and the print head according to the paper thickness of the print paper. By adjusting it, it is possible to set the distance between the first paper guide member and the second paper guide member according to the paper thickness of the print paper, which is stable for print paper of various thicknesses. Paper feeding can be realized.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a view showing a cross section of a main part of a serial printer according to an embodiment of the present invention, and FIG. 2 is a view showing a cross section of a slider. The same parts as those in FIG. 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the above figure, reference numeral 20 denotes a slider that is composed of a taper portion 20a having a sliding surface and a rack portion 20b having a rack gear, and is movably supported by the frame of the printer body. Thus, the taper portion 20a is brought into contact with the protruding portion 9c protruding from the downstream side of the first guide portion 9a of the paper pan 9, and the rack portion 20b is provided with the gear teeth formed on the surface of the eccentric bush 4. It meshes with 4a.

Further, the paper pan 9 is swingably supported by the frame of the printer main body, and the space between the paper pan 9 and the paper chute 6 is changed by moving up and down. On the other hand, when the lever provided on the frame of the printer body rotates and the rotation is transmitted to the eccentric bush 4 and the eccentric bush 4 rotates, the gear teeth 4a formed on the eccentric bush 4 and When transmitted to the meshed rack portion 20b, the slider 20 moves by an amount corresponding to the amount of rotation of the lever or the eccentric bush 4. As the slider 20 moves, the contact position of the protruding portion 9c that is in contact with the sliding surface of the taper portion 20a changes, and the protruding portion 9c moves up or down, causing the paper pan 9 to move up and down. To do.

Next, the operation of one embodiment of the present invention having the above structure will be described.

If the rotation of the lever is transmitted to the eccentric bush 4 and the eccentric bush 4 rotates in the direction a, the eccentric bush 4 is fixed to the eccentric bush 4 with an eccentricity from its center. The rail 3 rotates eccentrically, and the print head 1 mounted on the carriage held by the rail 3 moves in the direction b away from the platen 5. Therefore, the distance between the print head 1 and the platen 5 is widened.

Further, the rotation of the eccentric bush 4 is simultaneously transmitted to the slider 20 via the rack portion 20b, and the slider 20 moves in the arrow d direction while changing the contact position between the tapered portion 20a and the protruding portion 9c. Then, along with this movement, the protruding portion 9c, that is, the paper pan 9 moves in the direction of arrow e and descends. Therefore, the distance between the paper chute 6 and the paper pan 9 is widened like the distance between the print head 1 and the platen 5.

If the lever rotates in the opposite direction, the eccentric bush 4 also rotates in the opposite direction, and the print head 1, slider 20, and paper pan 6 also move in the opposite directions. , The distance between print head 1 and platen 5 and the distance between paper chute 6 and paper pan 9 are both narrow.

As described above, the space between the paper chute 6 and the paper pan 9 is adjusted by a mechanism (a lever, an eccentric bush 4, etc.) that adjusts the space between the print head 1 and the platen 5 according to the thickness of the print paper 2. It is adjusted by the interlocking slider 20.

In the above-described embodiment, the paper pan 9 is moved up and down by the slider 20 that interlocks with the eccentric bush 4. However, the invention is not limited to this. For example, the paper pan 9 swings on the frame of the printer body. A support mechanism that supports freely may be interlocked with the eccentric bush 4 to move up and down.

Further, the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0022]

[Effect of device]

 As described above in detail, according to the serial printer of the present invention, the first paper guide member and the first paper guide member are linked with the adjusting mechanism that adjusts the distance between the platen and the print head according to the paper thickness of the print paper. By adjusting the distance between the two paper guide members, the distance between the first paper guide member and the second paper guide member is set according to the paper thickness of the print paper. On the other hand, stable paper feeding can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a cross section of a main part of a serial printer according to an embodiment of the present invention.

FIG. 2 is a view showing a cross section of a slider.

FIG. 3 is a diagram showing a cross section of a main part of a conventional serial printer.

[Explanation of symbols]

 1 ... print head 2 ... print paper 4 ... eccentric bush (adjustment mechanism) 5 ... platen 6 ... paper chute (first paper guide member) 9 ... paper pan (second paper guide member) 20 ... slider (adjustment mechanism)

Claims (1)

[Scope of utility model registration request] 1. A serial printer having an adjusting mechanism for adjusting a distance between a platen and a print head according to a paper thickness of the print paper, wherein the print paper is guided to the platen.
A paper guide member, a second paper guide member swingable to guide the print paper to the platen while forming a conveyance path for the print paper facing the first paper guide member, and the adjusting mechanism. A serial printer, comprising: an adjusting mechanism for interlockingly moving the second paper guide member up and down to adjust a gap between the first paper guide member and the second paper guide member.