JPH0536698Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field of the Invention The present invention relates to a paper guide device for a printer of the type that performs printing by pushing fanfold paper through a paper guide plate toward a printing mechanism using a pin tractor mechanism. It is something.

PRIOR ART As shown in FIG. 4, in this type of conventional printer, a printer body 100 is supported on a printer stand 101, and a stack 103 of fan-foord papers 102 with perforations formed on both side edges is housed inside the stand 101. The fan-foord papers 102 are pulled out of the stack 103 and attached to the bottom wall 104 of the printer body 100.
The fanfold paper 102 is pulled out through an insertion opening 105 formed in the fanfold paper 102 and introduced into the printer body 100, and is pushed forward by a pair of pin tractor mechanisms 107 having pins 106 which respectively engage with the perforations of the fanfold paper 102, and is guided along a paper guide path between a first paper guide plate 108 and a second paper guide plate 109 to form a platen 11 which constitutes a printing mechanism.
0 and the print head 111 for printing.

The pair of pin tractor mechanisms 107 include a rotating body and a guide shaft 112a that rotate integrally with a drive shaft 112 driven by a reversible motor (not shown).
The drive shaft 11 is stretched around the upper support.
2, and the pin 106 is formed on the outer surface of this endless pin belt. Pin tractor mechanism 107
A swingable holding plate 113 having an escape groove 113a for the pin 106 is pivotally fixed to the pin 106, and the perforation of the fanfold paper 102 engaged with the pin 106 is engaged in the closed position where it contacts the pin tractor mechanism 106. This ensures stable feeding of the fanfold paper 102 by preventing the fanfold paper 102 from coming off the pin, and also enables the fanfold paper 102 to be loaded into the pin tractor mechanism 107 when opened to the chain line position. . Also Juan Fold Paper 1
When loading 02 for the first time, printer body 1
The operator can approach the pin tractor mechanism 107 by swinging the upper half of the pin tractor mechanism 107 upward, for example, counterclockwise.

As shown in FIG. 5, one or more paper support members 114 are disposed between the pair of pin tractor mechanisms 107 on a drive shaft 112 and a guide shaft 112a coaxially with these pin tractor mechanisms. It is designed to prevent the fan folded paper 102 that is placed and fed from bending to perform a good printing operation. As is well known, the pin tractor mechanism 107 and the paper support member 114 are swingable and positionable on the drive shaft 112 and the guide shaft 112a.

The print head 111 is supported on a carriage 116 which is guided by two guide shafts 115 and is slidable back and forth. The bail roller 117 can be pressed into contact with the platen 110 or detached from the platen 110.
and pin tractor mechanism 107 and platen 1
10 are driven synchronously, and the printing head 111 performs a reciprocating motion in synchronized relation with the operation of the pin tractor mechanism 107 and the platen 110 to perform the printing operation.

A paper guide 118 is provided for the purpose of guiding the cut paper around the platen 110 in cooperation with a friction roller (not shown) to perform printing.

Disadvantages of the Prior Art In printers of the type described above, the fanfold paper 102 has folds that are alternately folded in opposite directions and is thus fed out of the pin tractor mechanism 107 as shown in FIG. and these folds alternately to the left or right side of the fanfold paper 10
In particular, the second paper guide plate 109 has a tendency to protrude laterally from the second paper feeding line, and in particular, the second paper guide plate 109 can be extended downward as shown in the figure, but the first paper guide plate 108 made of a metal plate
, paper support member 114 and pin tractor mechanism 1
07 (because both members 114 and 107 can slide on the shaft),
In order to create a gap at the lower edge of the first paper guide plate 108, it is inevitable that the fanfold paper 102
If the fanfold paper 102 protrudes to the side of the paper guide plate 108, a blockage or jam occurs in this area as the fanfold paper 102 is fed.

Purpose of the invention The present invention eliminates the drawbacks of the prior art printers as mentioned above and reliably prevents jams that may occur due to folds in the fanfold paper when the fanfold paper is fed. The purpose of the present invention is to provide a paper guide device for a printer that enables the printer to perform the following tasks.

Summary of the invention In order to achieve the above-mentioned object, the paper guide device for a printer according to the invention moves fanfold paper, which has a series of perforations on both side edges thereof, by a pair of pin tractor mechanisms. In a paper guide device of a type of printer that performs printing by pushing the paper toward a printing function through a paper guide path formed by a guide plate, a part of the paper guide plate is placed on the fanfold paper introduction side of the paper guide plate. The free end portion of the attached flexible paper guide sheet is placed in a receiving groove formed in a paper support member that is supported coaxially with the pin tractor mechanism and guides the fanfold paper while preventing it from bending. It is characterized by being loosely fitted.

With the structure described above, even if the folds of the folded paper tend to protrude toward the first paper guide plate when the folded paper is sent out from the paper feeding mechanism, that is, the pin tractor mechanism, the flexible paper Since the lower edge portion of the guide sheet is loosely fitted into the receiving groove of the paper support member, the folds are continuously guided by the flexible paper guide sheet as they are fed out from the paper support member. The paper cannot protrude and is correctly fed within the paper guide path between the first and second paper guide plates to ensure correct printing pitch.

Embodiments of the invention A preferred embodiment of the invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows a printer incorporating a printer paper guide device according to the present invention. This printer has substantially the same structure and operation as the printer shown in FIG.
A stack 103 of fan-folded paper 102 with perforations formed on both side edges is housed inside, and the fan-fold paper 102 is formed on the bottom wall 2 of the printer body 1 from this stack 103. The fanfold paper 1 is pulled out through the insertion opening 3 and introduced into the printer body 1.
Pin 4 that engages with each perforation of 02
is pushed forward by a pair of pin tractor mechanisms 5 having Platen 8 and print head 9
The paper is fed during the printing process.

The pair of pin tractor mechanisms 5 have a rotating body that rotates integrally with a drive shaft 10 driven by a reversible motor (not shown), and an endless pin belt that is hooked around a support body on a guide shaft 11 and rotated. The pin 4 is attached to the outer surface of this endless pin belt.
The pin tractor mechanism 5 has a holding plate 12 having a pin relief groove similar to that in FIG. This ensures stable feeding of the fanfold paper 102 by preventing the pin from disengaging from the engagement, and also enables the loading of the fanfold paper 102 into the pin tractor mechanism 5 when released to the chain line position. is doing.

Similar to FIG. 4, between the pair of pin tractor mechanisms 5 shown in FIG. The supporting member 13 is arranged to prevent the fanfold paper 102 being fed from bending, thereby providing a good printing operation. Similarly to the conventional example described above, the pin tractor mechanisms 5, 5 and the paper support member 13 are connected to the two shafts 10, 1.
1. It can be slid and positioned freely.

The print head 9 is supported on a carriage 15 which is guided by two guide shafts 14 and is slidable back and forth. The bail roller 16 is configured to be able to select a position in which it presses against the platen 8 and a position in which it separates from the platen 8. The pin tractor mechanism 5 and platen 8 are driven synchronously, and the print head 9 reciprocates in synchronization with the operation of the pin tractor mechanism 5 and platen 8 to perform printing.

Similar to the one in FIG. 4, a paper guide 17 is provided for the purpose of guiding the cut paper around the platen 8 to perform printing in cooperation with a friction roller (not shown).

According to the feature of the present invention, as shown in FIG. A flexible paper guide sheet 18, such as Mylar, is provided below the lower ends of a number of vertical guide ribs 6a having an upper end affixed thereto and a free end extending downwardly. The lower free end portion of this paper guide sheet 18 is connected to a receiving groove 1 formed at the top of the paper support member 13.
3a, and thereby the fanfold paper 102 fed out from the pin tractor mechanism 5, even if the leftward fold of the paper 102 tries to protrude to the left, the paper support member 13 Since the right side and the paper guide sheet 18 continuously guide this fold to the guide rib 6a of the first paper guide plate 6, the fold does not jam at this portion when the fanfold paper 102 is fed. Any fear that may arise is completely eliminated. Furthermore, since the paper guide sheet 18 is flexible, there is no risk of damage when sliding on the shaft of the paper support member 13, and since the free end of the paper guide sheet 18 is within the receiving groove 13a, this free end The ends do not impart necessary elastic force (frictional resistance) to the fanfold paper 102.

Effects of the Invention According to the paper guide device of the printer according to the present invention configured as described above, the folds of the fanfold paper fed by the pin tractor mechanism protrude toward the first paper guide plate. Even when pushed, the free end portion of the flexible paper guide sheet affixed to the first paper guide plate will play in the receiving groove formed in the paper support member coaxially supported with the pin tractor mechanism. Since the folds are fitted, the folds are continuously guided to the first paper guide plate, and an excellent effect can be obtained in which the jam of the folded paper can be completely prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a printer incorporating a paper guide device according to the present invention. FIG. 2 is a front view showing the relationship between the pin tractor mechanism and the paper support member shown in FIG. 1. FIG. 3 is a partially detailed side view showing the relationship between the pin tractor mechanism, paper guide plate, and paper support member shown in FIG. 1; FIG. 4 is a schematic cross-sectional view of a printer incorporating a paper guiding device of the prior art.
FIG. 5 is a front view showing the relationship between the pin tractor mechanism and the paper support member shown in FIG. 4. Figure 6 is the 4th
FIG. 3 is a partially detailed side view showing the relationship between the pin tractor mechanism, the paper guide plate, and the paper support member shown in the figure. DESCRIPTION OF SYMBOLS 1... Printer main body, 2... Bottom wall, 3... Insertion opening, 5... Pin tractor mechanism, 6... First
paper guide plate, 6a... guide rib, 7... second paper guide plate, 8... platen, 9... print head, 13... paper support member, 13a... receiving groove,
18...Flexible paper guide sheet, 101...Printer stand, 102...Fanfold paper, 103...Stack.

Claims (1)

[Scope of utility model registration request] A pair of pin tractor mechanisms pushes fanfold paper, which has a series of perforations on each side edge portion, through a paper guide path formed by a paper guide plate toward a printing mechanism to perform printing. In the paper guide device of a printer of the type that performs A paper guide device for a printer, characterized in that the paper guide device is loosely fitted into a receiving groove formed in a paper support member that is coaxially supported and guides fanfold paper while preventing it from bending.