JPS5938912B2 - Printing machine paper guide mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper guide mechanism for a printing machine, and more particularly to a paper guide mechanism for a sequential printing dot matrix printing machine that prints on paper such as a bankbook.

In particular, for impact dot matrix printing machines, the appropriate gap between the print head and the surface of the paper to be printed is usually 0.5n or less, and it can be used on paper of different thickness depending on the page to be printed, such as a bankbook. When printing, the gap between the paper surface to be printed and the print head is maintained constant by pressing a print receiving member from the back side of the paper against a positioning member placed at a predetermined gap from the print head. This is effective in producing high-quality printing.

The positioning member needs to be provided with a passage opening necessary for the movement of the print head, and it is necessary to print paper such as a bank passbook, which is likely to have its edges turned over because it is owned by an individual owner. If the paper is inserted for this reason, there are disadvantages such as incorrect introduction or contact with the passage opening and the inability to feed the paper correctly.An object of the present invention is to improve the above-mentioned disadvantages,
To provide a paper guide mechanism for a printing machine which is improved in operability and prevents jamming when inserting and discharging paper.

In order to achieve the above object, the paper guide mechanism of the printing machine of the present invention defines a passage opening and has a desired gap for the print head to be movable across the surface of the paper to be printed. a positioning member that indicates a reference position for arranging the sheets facing each other; a printing member that is displaceable so that the sheet can be brought into pressure contact with the positioning member K; and a sheet guide means that engages with a passage opening of the positioning member in an openable and closable manner; The apparatus further includes a driving means for driving the sheet guiding means. Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a frame. Reference numeral 2 denotes a print head, which is a well-known dot print head that is supported by an unillustrated part of the frame 1 and is movable across the surface of the paper on which printing is to be performed.

Reference numeral 3 denotes an ink ribbon, which is driven and guided by known means (not shown).

Reference numerals 4 and 5 designate plate-shaped positioning members, which are fixed to the frame 1 and form an opening 30 that serves as a passage for not interfering with the movement of the printing head 2, which moves while printing.

A paper tray 6 is horizontally fixed to the frame 1, and the frame 1 and positioning members 4 and 5 constitute a feeding space 1a for paper 7, which is a recording medium.

Reference numeral 8 denotes a print receiving member, which is disposed opposite to the print head 2 and has a columnar shape with a flat pressure receiving surface so as to receive the printing force of the print head 2 during printing via the paper 7. There is.

The print receiving member 8 is supported so as to be movable toward or away from the print head 2 by a drive device (not shown). In FIG. 2 below, the positioning members 4 and 5 are disposed in the same plane, and the gap between the printing head 2 and the plane including the surface in contact with the printing surface of the paper 7 is maintained by a certain amount during printing. be maintained and maintained. Usually, the above-mentioned gap is a very small amount of 0.311 to 0.5 m1 in the case of an impact printing type dot printing head. The opening 30 formed by the positioning members 4 and 5 has a width sufficient not to inhibit the movement of the print head 2, and the pressure receiving surface of the print receiving member 8 is formed by the opening 3.
It has a width larger than 0, and has a structure that can be elastically biased and brought into contact with the lower surfaces of the positioning members 4 and 5. 9,10
1 is a roller for feeding the paper, and the roller 10 is elastically biased to constitute a known feeding means in which the paper 7 is pressed against the roller 9 so as to sandwich the paper 7 therebetween.

Hereinafter, in FIG. 1, reference numeral 11 denotes a plurality of paper guide members formed in a cylindrical shape, which are rotatably supported by a shaft member 12 passing through a center hole thereof.

The shaft member 12 is disposed parallel to the openings 30 of the positioning members 4 and 5, and is supported at both ends by two support members 13 which are pivotally supported by the frame 1 and are swingable. The support member 13 is fixed to a through shaft 14 that is supported by the frame 1 . In the following FIG. 3, the shaft member 12 is the support member 1.
The spring member 15 is loosely fitted into the long hole 13a formed in the opening 3, and the spring member 15 is suspended between the shaft member 12 and the support member 13 in the longitudinal direction of the long hole 13a.
0 (shown in FIG. 1), the guide member 11 is configured to protrude into the paper feeding space 1a. In Fig. 1 below, reference numeral 16 denotes a drive member, one end of which is pivotably supported by a pin 1b implanted in the frame 1, and supported in a recess 16a formed at the other end. It is loosely engaged with a drive pin 13b fixed to one of the members 13. Further, the driving member 16 is connected to an electromagnet device 17 disposed on the frame 1.
When an excitation voltage is applied to the support member 13, the support member 13 can be rotated clockwise via the drive pin 13b. A return spring 18 is suspended between the bent portion 1c of the frame 1 and the holding member 13, so that the holding member 13 can return to its original position when the electromagnet device 17 is de-energized. Become.

A permanent magnet 19 is fixed to one support member 13 via a fixture 20 made of a non-magnetic material.

Further, by fixing the reed relay 21 corresponding to the permanent magnet 19 to the frame 1, a detection means for detecting the position of the guide member 11 via the holding member 13 is configured.
That is, (see FIG. 2 below) the support member 13 is connected to the return spring 18.
The stopper 4b is energized and fixed to the positioning member 4.
When in contact with the reed relay 21, the reed relay 21 becomes a closed circuit due to the action of the permanent magnet 19, and in this state, the print head 2 becomes movable for printing. In this configuration, when the paper 7 is pressed against the positioning members 4 and 5 via the print receiving member 8 by a drive means (not shown), the guide member 11 is moved along the path of the print head 2 by the detection means. After confirming that it is waiting in a position where it will not cause any interference, the print head 2 is moved for printing. When the print is recorded on the paper 7 and the print head 2 returns to its original position,
The print receiving member 8 descends to release the paper 7 from the positioning members 4 and 5. At the same time, if a voltage is applied to the electromagnet device 1r, the support member 13 is biased clockwise via the drive member 16. Thus, as shown in FIG. 3, when the guide member 11 blocks the passage opening 30, the rollers 9, 10 can cooperate to feed the paper 7 by drive means, not shown. If the paper 7 is fed to the printing position while being held between only one group of rollers 9 and 10 as shown in this figure, the leading end 7a of the paper 7 is held by a guide member 11 that protrudes into the feeding space 1a. expertly guided by the passageway opening 3.
The paper is fed without jamming due to contact with the end face of the paper. When feeding of the paper 7 is completed, the power supply to the electromagnet device 17 is stopped, and the guide member 11 is biased to the print standby position by the action of the return spring 18. Thereafter, as shown in FIG. 2, the reed relay 21 becomes a closed circuit again, making it possible to indicate that the guide member 11 is not present in the path of the print head 2. As is clear from the above description, according to the present invention,
It is possible to realize an impact-type dot matrix printing machine that can print on recording media with different paper thicknesses.

In other words, it is possible to easily feed paper such as bankbooks, in which the edges of the paper are unavoidably disturbed, with a simple mechanism.
The original function of the dot matrix printing machine, which is high-speed printing, can be fully utilized. Furthermore, in order to prevent the paper guide means from interfering with the running of the print head and damaging the printing machine, the paper guide means should be protected even if an unexpected power failure occurs due to a power outage to the drive source, circuit damage, etc. can be automatically returned to the print standby position by a return spring, and also has the advantage of having a detection means that allows easy confirmation that the guide means is in the print standby position.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts of a printing machine for explaining this embodiment. FIG. 2 is a side view taken along arrow A in FIG. 1, including a partial cross section. FIG. 3 is an explanatory diagram of the operating state of the paper guide mechanism shown in FIG. 2. 1... Frame, 2... Print head, 4, 5... Positioning member, 8...
Print receiving member, 11...Paper guide member, 13...
...Supporting member, 16...Driving member, 17.
...Electromagnetic device, 18...Return spring, 1
9...Permanent magnet, 20...Reed relay.

Claims (1)

[Scope of Claims] 1. A positioning member disposed at a predetermined distance opposite a print head movable across a print sheet and provided with a passage opening for the print head; In the paper guide mechanism of a printing machine, the improved paper guide mechanism includes a print receiving member disposed on the opposite side of the print head and capable of pressing the print paper against and separating the print paper from the positioning member. The paper guide means includes a paper guide means that penetrates through, blocks, and opens the print head passage opening of the positioning member, and the paper guide means includes support members swingably disposed on both sides of the positioning member, and both supports. A member is provided between the ends of the member, passes through and shields the print head opening, the end thereof engages with the print paper, and slides vertically relative to the print paper surface at the print head opening shielding position. a paper guide member mounted to allow the paper guide member to pass through the print head passage opening, spring means for biasing the paper guide member in a direction to press the paper guide member against the print paper; A paper guide mechanism for a printing machine, comprising means for swinging the paper guide member between the position where the paper guide member retracts out of the path of the print head. 2. A paper guide mechanism for a printing machine according to claim 1, wherein the paper guide member is a plurality of cylindrical members rotatably pivoted in the moving direction of the printing paper. 3. The swinging means for the support member includes a spring means for biasing the support member in a direction in which the paper guide member is separated from the positioning member, and a spring means for biasing the support member in a direction in which the paper guide member is moved away from the positioning member, and a spring means for biasing the support member in a direction in which the paper guide member is moved away from the positioning member, and the print head of the paper guide member is moved against the force of the spring means. 2. A paper guide mechanism for a printing machine according to claim 1, further comprising an electromagnetic device for driving the support member to a passage opening blocking position.