JPH0747352B2 - Stamp printer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] In a stamp printing apparatus, the platen of the printing unit is provided with sideboards that are independently suspended to the left and right, and is affected by the thickness of the printing medium, the presence of contents in the printing medium, and the like. It is possible to perform stable printing without causing any trouble.

[Industrial application field]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stamp printing device that stabilizes printing quality and accuracy for stamp printing on a printing medium.

As a device for printing a stamp, for example, a bill on an envelope,
There is an envelope depositing machine that deposits receipts and securities. In this case, insert an envelope containing bills and the like into an envelope deposit machine, and print the date, account number,
The personal identification number is printed and stored in the safe at the bottom.

Depending on the contents enclosed in the envelope, the envelope wall thickness and envelope shape vary, and the envelope becomes irregularly deformed. Also, since there are binding sections at both ends of the envelope, the envelope sent to the printing unit is deformed, the envelope printing surface becomes distorted, and normal printing is not performed.
Print defects and blurring occur. Therefore, there is a demand for a stamp printer that can prevent the distortion of the envelope print surface and perform normal printing.

[Conventional technology]

FIGS. 3A and 3B are views for explaining conventional stamp printing.

FIG. 3 (a) shows the printing unit of the envelope depositing machine, and 1 is an envelope in which, for example, a bill B is contained as the content. Reference numeral 2 is a fixed roller, which is rotated by a conveying envelope, and 3 is a movable roller, which is movable up and down, and is rotationally driven while constantly pressing the envelope 1 by a spring (not shown). A platen 4 constantly presses the envelope 1 in the same manner as the movable roller 3, and is further rotationally driven to receive the printing pressure of the stamp. 5 is a stamp, which is a typeface for printing on the circumference 6
And has a function of moving up and down for printing. A fixed pinch roller 7 is provided for ensuring a correlation position between a stamp stroke for printing and a mask 8 for masking characters other than necessary characters, and for smooth envelope conveyance. Only one of the masks 8 is fixed to the transport guide 9.

[Problems to be solved by the invention]

In stamp printing, the envelope 1 is conveyed from A to A'direction by the conveying rollers 2 and 3 as shown in FIG. 3 (A), and when it reaches a certain position, the stamp 5 rotates as necessary and moves vertically. By doing, the letter 6 of the stamp 5 hits the envelope 1 and is printed. However, if the positional relationship between the envelope 1 and the stamp 6 is behind the LL plane, printing defects and blurring occur.

This occurs by the following mechanism.

As shown in FIG. 3B, when the platen pressurizing pressure P1 and the stamp pressing pressure P2 act on the envelope 1 in the printing section,
The solid line ab-c of the envelope 1 is the dotted line ab'-c.
It deforms irregularly as shown in.

This irregular deformation is due to binding parts at both ends of the envelope 1.
The fixed pinch roller 7 is generated to promote the above action. If the stamp 5 is deformed in the form of dotted line ab'-c, the printing surface of the envelope is distorted even if the stamp 5 prints on the envelope, so normal printing operation cannot be performed.
There was a problem that print defects and scraping occurred.

The present invention has been made in view of the above points, and an object thereof is to provide a stamp printing apparatus that enables stable printing regardless of the envelope wall thickness, the presence of envelope contents, and the like.

[Means for solving problems]

1 (a) and (b) are diagrams for explaining the principle of the present invention.
(A) is a perspective view of the platen of the present invention, and (B) is a conveyance state diagram of the envelope.

FIG. 1 (a) shows the platen of the present invention, the structure of which is
Ski-shaped sideboards 11 are suspended on both sides of the envelope 1 across the platen 10 so that the seesaw can move freely. It should be noted that the platen 10 should be 0.1 mm larger than the sideboard 11 so that the envelope 1 (print medium) can be given a feeding motion.
Only 0.5 mm should be projected.

A stamp printing apparatus that has a transport roller that transports the envelope 1 to a printing unit and a stamp 5 that can move in a contact / separation direction with respect to the platen 10, and that sandwiches the envelope 1 between the stamp 5 and the platen 10 to print. Applied to replace the platen 10 with the sideboard 11 described above.

Then, the lower surface of the sideboard 11 is brought into contact with the envelope 1 in the conveyed state, so that movement of the binding portion T of the envelope 1 is restricted and printing is performed.

[Action]

FIG. 1 (B) shows a state in which the envelope of the printing section is conveyed, and the pinch roller 7 ensures the correlation position between the stroke of the stamp 5 and the mask 8. The contact point a between the envelope 1 and the sideboard 11 in the conveyed state and the contact point a ′ between the sideboard 11 and the conveyance guide 9 change according to the conveyed state of the envelope 1 (envelope shape changes due to the presence of contents). Therefore, it is possible to avoid pressing the envelope more than necessary, and by receiving the envelope 1 on the surface of the sideboard 11, it is possible to prevent the envelope binding portion T from rising. As a result, the unnecessary movement of the binding portion T of the envelope can be controlled, so that the envelope 1
Of the stamp, the printing surface Q becomes flat and the stamp 5
Normal printing is performed by moving upward.

Also, since the sideboard 11 is left and right independent suspension,
Envelope 1 with complicated shape caused by irregularity of envelope contents B
Since it can be pressed in on a case-by-case basis against irregular deformation of, it can always perform normal printing without chipping or blurring.

〔Example〕

2 (a) and (b) are diagrams for explaining the embodiment of the present invention.
(A) is a plan view of the platen of the present invention, and (B) is a front view of the stamp printing apparatus. Note that the same reference numerals are the same symmetrical objects throughout the drawings.

As shown in FIG. 2 (a), ski-shaped sideboards 11 are suspended on both sides of the platen 10 so that the seesaw can move freely. More specifically, the platen shaft 12 is supported by a column 14 via a bearing 13, and the lower portion of the column 14 is fixed to a ski-shaped sideboard 11. The sideboard 11
Are positioned with respect to the platen shaft 12 via bearings 13 and independently suspended from side to side. The two plate-shaped inner frames 15 are connected at their opposite ends by stays 16, and the platen shaft 12 is pivotally supported at the other ends of the inner frames 15.

A drive shaft 17 for rotating the platen 10, that is, the platen shaft 12, is pivotally supported at a position near the stay 16 of the inner frame 15. The drive shaft 17 is pivotally supported by an outer frame 18 that constitutes a device provided outside the inner frame.

Pulleys P are fitted on the platen shaft 12 and the drive shaft 17, respectively, and these pulleys P are connected via a belt 24. Further, pulleys P are respectively fitted to the other end of the drive shaft 17 and a rotating shaft of a motor M installed in the apparatus, and these pulleys P are connected via a belt 19. Therefore,
When the motor M is driven, the platen 10 rotates.

On the other hand, the inner frame 15 rotatably supports the drive shaft 17 as described above, and the drive shaft 17 is the outer frame.
Since it is pivotally supported by 18, the platen 10 (including the column 14 and the sideboard 11) can swing about the drive shaft 17.

The inner frame 15 is stretched by a spring (not shown), and the other end of the inner frame 15 is constantly urged toward the stamp 5 by the spring. The other end of the inner frame 15 is connected to the platen shaft 12 as described above.
The platen 10 is urged together with the inner frame 15 to constantly press the transport envelope.

As described above, the platen 10 is provided with the ski-shaped sideboards 11 independently suspended on both sides in the width direction of the envelope 1, and is swingable around the drive shaft 17 pivotally supported by the outer frame 18.
2 is replaced with the platen 4 of the conventional stamp printing apparatus shown in FIG. 3 (a) to construct the stamp printing apparatus as shown in FIG. 2 (b). Reference numerals 2 and 3 denote the same conveying rollers as those in FIG. 3 (a) of the related art, 2 is a fixed roller, 3 is a movable roller, and the movable roller 3 is rotated by a drive pulley 22 via a belt 21. A spring 23 is stretched around the three shafts and the drive pulley 22 shaft, and the movable roller 3 presses the conveyed medium and rotates. In addition, the stamp 5, the pinch roller 7, the mask 8, and the transport guide 9 having the character 6 are the same as those in the conventional case shown in FIG.

When the envelope is conveyed and reaches a certain fixed position, the stamp 5 rotates as necessary and moves up and down to print the type 6 on the envelope.

At this time, since the sideboard 11 is independently suspended on the left and right sides, the sideboard 11 changes depending on the state of conveyance of the envelopes and contacts. As a result, unnecessary movement of the binding portion of the envelope is controlled, and printing can be performed on the surface having increased rigidity. Even if the envelope contents are irregularly deformed, they can be pushed in by case by case, so that normal printing can be always performed without chipping or blurring.

〔The invention's effect〕

As described above, according to the present invention, the platen of the printing unit is provided with sideboards independently suspended on the left and right,
It is possible to perform stable printing that is affected by the envelope wall thickness, the presence of envelope contents, and the like.

[Brief description of drawings]

FIG. 1 (a) (b) is a diagram for explaining the principle of the present invention, FIG. 2 (a) (b) is a diagram for explaining an embodiment of the present invention, and FIG. 3 (a) (b) is conventional. FIG. 6 is a diagram illustrating stamp printing of FIG. In the figure, 1 is an envelope, 3 is a movable roller, 5 is a stamp, 7 is a pinch roller, 8 is a mask, 9 is a transport guide, 10 is a platen, 11 is a sideboard, 12 is a platen shaft, 13 is a bearing, and 14 is a A column, 16 is a stay, 17 is a drive shaft, 18 is an outer frame, 19, 21, 24 are belts, 22 is a drive pulley, and 23 is a spring.

Claims (1)

[Claims] 1. A transport roller for transporting a print medium (1) to a printing section, and a stamp (5) movable in a contact and separation direction with respect to a platen (10). A stamp printing device for printing by sandwiching the print medium (1) with a platen (10), the ski form being independently suspended on both sides in the width direction of the print medium (1) with the platen (10) sandwiched therebetween. Sideboards (11)
By providing the lower surface of the sideboard (11) with the print medium (1) in a conveyed state, the movement of the binding portion (T) of the print medium (1) is restricted to perform printing. Characteristic stamp printing device.