Printing mechanism for needle printer

Abstract

The utility model provides a printing mechanism for a needle printer, which comprises two printing strips arranged on a rack below a printing head, and is characterized in that the number of the printing strips is two, and an adjusting mechanism is arranged between each printing strip and the rack. The distance between the printing strip and the corresponding certificate can be conveniently adjusted through the adjusting mechanism, the printing face of the certificate is always kept in a flat state, and it is ensured that clear characters can be printed on the two side faces, with different thicknesses, of the certificate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a printing mechanism, especially a printing mechanism for a pin type printer, and belongs to the technical field of office machinery and equipment design and manufacturing. BACKGROUND

[0002] The pin type printer is a widely used printing device, and its working principle is that a plurality of needle tips on a printing head strike a ribbon to transfer ink on the ribbon to a paper to finally form characters and images. In the prior art, when a pin type printer is used to print a longitudinal bound (vertical stitched) certificate (such as a bank passbook), the situation that the thicknesses of the two sides of the certificate at the stitching position are inconsistent is inevitably encountered. Since the traditional pin type printer adopts an integrated floating printing mechanism, the paper surface on the side with a large thickness can clearly present the printed characters because the distance from the printing needle head is small, and the paper surface on the side with a small thickness will appear unclear printing because the distance from the printing needle head is large. If the distance between the paper surface on the side with a small thickness and the printing needle head is adjusted, the paper surface on the side with a large thickness or even the needle head will be damaged, resulting in that the printer cannot be used. Therefore, it is necessary to improve the prior art. SUMMARY

[0003] To solve the problem that the prior art pin type printer cannot clearly print when printing a certificate with uneven thickness, the utility model provides a printing mechanism for a pin type printer.

[0004] The utility model discloses a printing mechanism for a pin type printer, which comprises a printing strip arranged on a rack below a printing head, characterized in that the printing strip is arranged as two spaced strips, and an adjusting mechanism is arranged between each printing strip and the rack to adjust the distance between the printing strip and the corresponding certificate and keep the printing surface of the certificate flat to ensure that the two side surfaces of the certificate with different thicknesses can print clear characters.

[0005] A corresponding adjusting mechanism is arranged below each printing strip. The adjusting mechanism comprises a plurality of vertical guide rods symmetrically or asymmetrically arranged on the rack below the printing head, a plurality of vertical guide holes arranged on the bottom of the printing strip, and a spring arranged on each vertical guide rod. The upper end of each vertical guide rod is inserted into the vertical guide hole at the bottom of the corresponding printing strip. Each spring is arranged on the vertical guide rod between the bottom of the printing strip and the rack to make the printing strip ascend or descend along the vertical guide rod during printing. The height of the printing strip is automatically adjusted by the spring according to the thickness of the certificate to keep the printing surface flat.

[0006] The lower end of the vertical guide hole is sleeved with a limiting ring with a through hole in the center, the upper end of the vertical guide rod is inserted into the vertical guide hole through the through hole, and is screwed with the limiting block in the vertical guide hole, the diameter of the limiting block is adapted to the inner diameter of the vertical guide hole, so that the vertical guide rod is prevented from being separated from the vertical guide hole and moves smoothly in the vertical guide hole while the printing bar is prevented from compressing the spring during the descending process.

[0007] The utility model has the following advantages and effects: the distance between the printing bar and the corresponding certificate can be adjusted through the adjusting mechanism, and the printing surface of the certificate can be kept flat at all times, ensuring that the right side a1 of the certificate with thick thickness and the left side a2 of the certificate with thin thickness can print clear characters. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0009] Figure 1 It is a structural diagram of the utility model;

[0010] Figure 2 It is Figure 1 A local enlarged view of the A. DETAILED DESCRIPTION

[0011] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model. EMBODIMENT

[0012] The utility model provides a printing mechanism for needle type printer, including printing bar 2 of being located in the rack 1 below the print head 4, the printing bar 2 is equipped as two intervals, and the adjusting mechanism 3 is equipped between each printing bar 2 and the rack 1, such as Figure 1 In order to adjust the distance between the printing bar 2 and the corresponding certificate through the adjusting mechanism, and keep the printing surface of the certificate flat at all times, ensuring that the right side a1 of the certificate with thick thickness and the left side a2 of the certificate with thin thickness can print clear characters.

[0013] The adjusting mechanism 3 is arranged below each printing bar 2, and comprises a plurality of vertical guide rods 9 arranged symmetrically on the frame 1 below the printing bar 2, a plurality of vertical guide holes 6 arranged on the bottom of the printing bar 2, and a spring 10 sleeved on each vertical guide rod 9, the upper end of each vertical guide rod 9 is inserted into the lower end of the corresponding vertical guide hole 6, and each spring 10 is arranged on the vertical guide rod 9 between the bottom of the printing bar 2 and the frame 1, so that the printing bar 2 can be raised or lowered along the vertical guide rod 9 during printing, and the height of the printing bar 2 is automatically adjusted according to the thickness of the certificate by the spring 10, so that the printing surface is always flat.

[0014] A limiting ring 8 is sleeved on the open lower end of the vertical guide hole 6, the limiting ring 8 is provided with a through hole in the center, the upper end of the vertical guide rod 9 is inserted into the vertical guide hole 6 through the through hole, and is screwed with the limiting block 7 in the vertical guide hole 6, the diameter of the limiting block 7 is adapted to the inner diameter of the vertical guide hole 6, so that the vertical guide rod 9 is prevented from being separated from the vertical guide hole 6 and moves stably in the vertical guide hole 6 by the limiting block 7 when the printing bar 2 is compressed during the descending process.

[0015] In the description of the present specification, the description of the terms "one embodiment", "example", "specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0016] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A print mechanism for a needle printer comprising a print bar mounted on a chassis below a printhead, characterised in that The printing strips are arranged in two spaced-apart rows, and each printing strip is provided with an adjusting mechanism between the printing strip and the frame; The adjusting mechanism comprises a plurality of vertical guide rods symmetrically or asymmetrically arranged on the frame below the printing head, a plurality of vertical guide holes correspondingly arranged on the bottom of the printing strip, and a spring sleeved on each vertical guide rod, the upper end of each vertical guide rod being inserted into the lower end of the vertical guide hole on the bottom of the corresponding printing strip, and each spring being located on the vertical guide rod between the bottom of the printing strip and the frame.

2. The print mechanism according to claim 1, wherein A limiting ring is sleeved at the open lower end of the vertical guide hole, the limiting ring is provided with a through hole at the center, the upper end of the vertical guide rod is inserted into the vertical guide hole through the through hole, and the vertical guide rod is screwed with a limiting block in the vertical guide hole, the diameter of the limiting block being adapted to the inner diameter of the vertical guide hole.

Images