JPH10258559A - Form-guiding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate cleaning between a hammer and a type drum by removal from a hammer shaft by detachably providing at the shaft in a form guiding apparatus for guiding the form from above between the drum and the hammer. SOLUTION: This apparatus comprises a form guiding member 20 disposed between a type drum 15 and a hammer 21 to guide a form P from above. The member 20 has a guide surface 26 on an upper surface, legs 25 and a locking part 29 at a lower part with the leg 25 having an engaging part 37 at its lower end. The part 37 is detachably engaged with a hammer shaft 22 to lock the part 29 to a body frame side as a rotation-stop around the shaft 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper guide for guiding a paper from above between a type drum and a hammer.

[0002]

2. Description of the Related Art A paper guide for guiding a cut sheet inserted from above toward a print position set between a print drum and a print roller has been proposed, for example, in Japanese Patent Application Laid-Open No. 5-546. I have.

[0003] A sheet paper guide and a spring sheet facing each other are arranged between a printing position set between a print drum and a printing roller and a sheet paper insertion section provided in a printer exterior part above the printing position. A paper guide auxiliary plate having a sheet guide is arranged, and the upper end of the cut sheet guide and the upper end of the paper guide auxiliary plate are bent by an angle θ in a direction to open with respect to the insertion direction of the cut sheet, and formed.
A cut sheet guide section is provided on both sides of a paper guide auxiliary plate. In this case, the cut sheet guide is simply attached to the frame body.

In a printer that performs printing using a type drum and a hammer, an ink ribbon is interposed between the type drum and the hammer, and a sheet is inserted into the type drum, and the hammer is directed toward the type drum surface. Printing is performed by stamping with For this reason, if the hammer's stamping operation is performed repeatedly, ink residue, fine paper residue, and dust that fall off the ink ribbon are generated, and are likely to collect between the hammer and the type drum. Requires cleaning.

However, if the paper guide is interposed between the type drum and the hammer, it is difficult to remove dust and the like accumulated between the hammer and the type drum and cleaning is difficult.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a paper guide device for guiding a paper between a type drum and a hammer from above, which is detachable from a hammer shaft and which is detached from the hammer shaft. And cleaning between the print drum and the print drum.

[0007]

The paper guide device guides the paper between the type drum and the hammer from above. Note that, as the sheet, a single sheet, a recording sheet or a bill including two or more sheets can be used.

A paper guide member is disposed between the type drum and the hammer. The paper guide member has a paper guide surface on the upper surface, a leg and a locking portion at a lower portion, and a lower end of the leg is an engagement portion. The engaging portion is detachably engaged with the hammer shaft, and the engaging portion is engaged with the main body frame to prevent the hammer shaft from rotating. The legs are
It is preferable to provide the sheet guide member on both sides.

A paper guide member for guiding the paper between the type drum and the hammer from above is detachable from the hammer shaft by an engaging portion provided at the lower end of the leg. Can be removed from the
Cleaning between the hammer and the type drum is facilitated. The locking portion provided on the paper guide member is attached to the body frame side (for example,
(Hammer guide) Locks and stops the paper guide member from rotating around the hammer shaft.

Further, the support shaft for engaging the engaging portion of the paper guide member can be a hammer shaft which supports the hammer, thereby reducing the number of parts.

The following configuration can be added to the above configuration. The paper guide member may be configured to have a hammer accommodating recess that covers the upper side of the hammer on the side facing the type drum. Since the upper side of the hammer is covered by the hammer storage recess, it is possible to prevent a finger from being pinched between the hammer and the type drum, or to prevent a fallen object from directly hitting the hammer and damaging the hammer.

A bulging portion is formed on the guide drum side edge of the guide surface of the paper guide member toward the character drum, and the ink ribbon disposed between the hammer and the character drum is positioned below the bulging portion. May be arranged. Since the ink ribbon is located below the bulge provided at the edge of the guide surface on the type drum side, the leading end of the paper guided along the guide surface can be smoothly guided without being caught on the ink ribbon.

A cassette mounting portion may be provided on the main body frame side adjacent to the paper guide member, and the guide surface of the paper guide member may also serve as an ink ribbon guide for guiding the ink ribbon to a printing position. Since the guide surface of the paper guide member guides the ink ribbon to the printing position when the ink ribbon cassette is mounted on the cassette mounting portion, the ink ribbon cassette can be smoothly mounted, and the guide surface of the paper guide member is the ink ribbon. Since it also serves as a guide, it is not necessary to provide an ink ribbon guide.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view schematically showing a printer 1 according to an embodiment to which the paper guide device of the present invention is applied. The printer 1 includes a main body frame 2, a rotating frame 3 arranged from the center of the upper part of the main body frame 2 to the rear, and an auxiliary frame 4 attached to a right side of the main body frame 2. A winding mechanism 5 for winding the printed paper is provided.
A cassette mounting frame 6 is mounted on a front upper surface of the main body frame 2, and an ink ribbon cassette 7 is mounted on the cassette mounting frame 6.

FIG. 2 is a right side view of the printer 1 with the auxiliary frame 4 and the winding mechanism 5 removed. In FIG. 2, the left is the front of the printer 1 and the right is the rear of the printer 1. The rotating frame 3 is provided so as to be rotatable around a rear portion with respect to the main body frame 2. The main body frame 2 includes left and right side frames 8 and 9 forming left and right side portions. In FIG. 2, only the right side frame 9 is shown.

The rotating frame 3 is supported by a support shaft 10 laid between the upper rear edge of the left side frame 8 of the main body frame 2 and the upper rear edge of the right side frame 9, and the lower rear end thereof. It is pivotally supported and provided rotatably. In addition, although not shown in FIG.
A paper conveyance path is formed between the main body frame 2 and the main body frame 2. FIG. 2 shows a state in which the rotating frame 3 is in a closed position where the printing paper can be transported so as to cover the upper side of the paper transport path of the main body frame 2. Lock levers 11, 11 for locking the rotating frame 3 to the closed position shown in FIG. 2 with respect to the main body frame 2 are provided rotatably near the front ends on the left and right sides of the rotating frame 3.

In FIG. 2, a paper feed drive unit 13 including a paper feed roller 12 is provided on the rotating frame 3. Further, the main body frame 2 has a printing drive unit including a pressing roller 14, a type drum 15, and a hammer (not shown) which form a pair with the paper feed roller 12 and are movably pressed toward the paper feed roller 12. 16, a ribbon feed mechanism 17 for feeding the ink ribbon of the ink ribbon cassette 7, a reduction gear train mechanism 18 that is rotated by a drive motor (not shown) and transmits power to the paper feed drive unit 13, the print drive unit 16, and the ribbon feed mechanism 17. A reset sensor S1 for generating a reset pulse signal for each rotation of the character drum 15, and a character for generating a group of character pulse signals corresponding to each character position arranged on the peripheral surface of the character drum 15. A pulse sensor S2 is provided.

Although not shown, the printer 1
Has a sheet transport path in the left-right central as a boundary, are fixed to the print drum shaft 19 together with the print drum 15, 15 are respectively disposed with respect to the paper transport path of the left and right.
A paper guide member for guiding the paper from above is arranged in front of the type drum 15 and along the rear edge of the cassette mounting frame 6.

FIG. 3 is an enlarged view of a main part of FIG. 2 for mainly explaining the paper guide member 15. As shown in FIG. In FIG.
On the front side of the type drum 15, a plurality of digits of hammers 21 driven toward the peripheral surface of the type drum 15 by a solenoid (not shown) for performing printing are aligned and supported by a hammer shaft 22. Note that the print drive unit 16 is a part configured to include the print drums 15, 15 and hammers 21 of a plurality of digits. The multi-digit hammers 21 are provided for each of the left and right type drums 15, 15.

Each of the hammers 21 is constantly urged to an initial position separated from the type drum 15 by the urging force of a hammer spring 23. Further, the hammer 21 is connected to the hammer shaft 2.
A hammer guide 24 that guides in two rotation directions is attached to the main body frame 2. Paper guide member 20
The type drum 15 so as to cover the upper part of the hammer 21.
, And a lower leg 25 is detachably engaged with the hammer shaft 22 and supported.

FIG. 4 is a perspective view of the paper guide member 20. The paper guide member 20 has a horizontally elongated shape in the left-right direction of the main body frame 2. In FIG. 4, the paper guide member 20 is arranged from the rear side facing the type drum 15.
Is shown. On the upper portion of the paper guide member 20, a paper guide surface 26 that is inclined so as to descend from near the upper front edge toward the middle of the rear portion is formed in the lateral direction. At the lower end edge of the paper guide surface 26 near the type drum 15, a bulging portion 27 is formed in the lateral direction toward the rear.

A support 28 is provided at the center of the paper guide member 20, and a locking projection 29 having a columnar shape is provided on the lower surface of the support 28. To the left and right of the support portion 28, that is, from the left side of the support portion 28 to the left inside of the paper guide member 20, and from the right side of the support portion 28 to the right inside of the paper guide member 20,
Hammer storage recesses 30a, 30 opened rearward and downward
b are provided respectively.

The left hammer storage recess 30a has an upper wall 31 for closing the upper side, a front wall 32 for closing the front side, a right side wall 33 for the support part closing the right side, and a left side wall 34 for closing the left side.
The right hammer storage concave portion 30b includes an upper wall 31 closing an upper side, a front wall 32 closing a front side, a right wall 35 closing a right side, and a support portion left wall 36 closing a left side. Is provided.

On the left and right sides of the paper guide member 20,
The legs 25, 25 extending downward are provided, respectively, and the lower ends of the legs 25, 25 are provided with engaging portions 37, 37 that engage with the hammer shaft 22, respectively. Each of the engaging portions 37, 37 is a pair of front and rear holding pieces 3
8, 38 are formed, and an engagement hole 39 whose lower side is opened is provided between the pair of holding pieces 38, 38.

FIG. 5 is a perspective view showing attachment of the paper guide member to the hammer shaft 22 and the hammer guide 24. In FIG. 5, the hammer guide 24 is attached from the inside of the left side frame 8 of the main body frame 2 to the inside of the right side frame 9. On the upper surface of the hammer guide 24, a plurality of guide slits 40 are provided for each of the left and right hammers 21 of a plurality of digits to guide the character drum 15 (not shown).
Is supported by the hammer shaft 22 and the head 21 ′ at the tip is arranged to protrude upward from the guide slit 40. In FIG. 5,
Only one hammer 21 is shown, and the other is not shown.

A support plate 41 is provided at the upper center of the hammer guide 24, and a support hole 42 is formed in the support plate 41. Also, the left side frame 8 and the hammer guide 2
4 are formed between the upper left end of the upper surface 4 and the right end of the right side frame 9 and the upper right end of the hammer guide 24.

The paper guide member 20 is attached to the hammer shaft 22 and the hammer guide 24 as follows. FIG.
As shown in FIG. 5, supporting legs 25, 25 provided on the left and right sides of the paper guide member 20 are inserted into insertion openings 43, 43 opened inside the left side frame 8 and inside the right side frame 9 of the main body frame 2, respectively. Are inserted from above, and the locking projection 29 provided on the lower surface of the support portion 28 of the paper guide member 20 is attached to the support plate portion 4 of the hammer guide 20.
1 is inserted into the support hole 42 provided in the device 1. Then, the engaging portions 37 at the lower ends of the left and right legs 25, 25 of the paper guide member 20,
37 is pushed into both ends of the hammer shaft 22, and the hammer shaft 22 is fitted into the engagement holes 39 of the engagement portions 37, 37.

The paper guide member 20 includes the left and right engagement portions 3.
The engagement protrusion 29 is inserted into and supported by the support hole 42 of the hammer guide 24 so that the rotation of the hammer shaft 22 is prevented. The lower surface of the support 28 of the paper guide member 20 is in contact with the support plate 41 on the upper surface of the hammer guide 24.

FIG. 6 is a schematic cross-sectional view of a main part showing a state in which the paper guide member 20 is attached. Paper guide member 20
Is attached to the hammer shaft 22 and the hammer guide 24, between the bulging portion 27 formed at the lower end edge of the paper guide surface 26 of the paper guide member 20 and the character type drum 15, for example, A paper insertion opening 44 for manual paper such as recording paper or bills, which is a set of two or more papers, is formed. When the paper P is inserted into the paper insertion slot 44 from above, the lower end of the paper P is
The position in the insertion direction is determined by abutting on the upper surface of 4.

Further, the head portion 21 'of the hammer 21 of a plurality of digits is housed in the hammer housing concave portion 30 provided on the side opposite to the type drum 15, and the upper side of the hammer 21 is covered by the hammer housing portion 30. It is possible to prevent the finger from being easily caught between the hammer 21 and the type drum 15 or to prevent the falling object from directly hitting the hammer 15 and damaging the hammer 15.

As shown in FIG. 1, when the ink ribbon cassette 7 is mounted on the cassette mounting frame 6 of the printer 1, the front surface of the intermediate portion of the ink ribbon cassette 7 is guided by the front surface of the front wall 32 of the paper guide 20. Since the ink ribbon is guided along the inclination of the guide surface 26 of the paper guide member 20 so as to slide to the lower printing position, the ribbon cassette 6 can be mounted smoothly. When the ink ribbon cassette 7 is mounted, both side portions of the paper guide member 20 are arranged close to the inside of the ribbon arms 45 on both sides of the cassette 7.

As shown in FIG. 6, the ink ribbon 46 is
The paper guide surface 26 is stretched laterally below a bulging portion 27 provided at the edge of the type drum 15 on the type drum 15 side, so that the leading end of the paper P guided along the paper guide surface 26 is It can be guided smoothly without getting caught on 46.

The paper guide member 20 is pulled upward, so that the hammer shaft 22 and the hammer guide 2 are pulled out.
4 can be removed. The paper guide member 20 is
Since the paper guide member 20 is detachable from the hammer shaft 22, the cleaning between the hammer 21 and the type drum 15 is facilitated by removing the paper guide member 20 from the hammer shaft 22.

[0034]

According to the paper guide apparatus of the present invention, the paper guide member for guiding the paper from above between the type drum and the hammer is formed by the engaging portion provided at the lower end of the leg with respect to the hammer shaft. Since it is detachable, the paper guide member can be removed from the hammer shaft, and cleaning between the hammer and the type drum becomes easy. Since the locking portion is provided on the paper guide member, the locking portion can be locked on the main body frame side (for example, a hammer guide) to prevent rotation around the hammer shaft. Since the support shaft that engages the engagement portion provided at the lower end of the leg of the paper guide member is a hammer shaft that supports the hammer, the number of parts can be reduced.

If the paper guide member is provided with a hammer storage recess on the side facing the type drum, the upper side of the hammer is covered by the hammer storage recess. It is possible to prevent the hammer from being caught in the hamper and the falling object from directly hitting the hammer and damaging the hammer.

A bulging portion is formed at the edge of the guide surface of the paper guide member on the type drum side toward the type drum side, and the ink ribbon disposed between the hammer and the type drum is positioned below the bulging portion. In this configuration, the ink ribbon is located below the bulging portion provided at the end of the guide surface on the type drum side, so that the leading end of the paper guided along the guide surface is hooked on the ink ribbon. Can be guided smoothly without any problems.

If a cassette mounting portion is provided on the main body frame side adjacent to the paper guide member, and the guide surface of the paper guide member also serves as an ink ribbon guide for guiding the ink ribbon to the printing position, the ink ribbon cassette is mounted on the cassette. Since the guide surface of the paper guide member guides the ink ribbon to the printing position when the paper guide member is mounted on the unit, the mounting of the ink ribbon cassette can be performed smoothly, and the guide surface of the paper guide member also serves as the ink ribbon guide.
There is no need to particularly provide an ink ribbon guide.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a printer according to an embodiment to which a paper guide device of the present invention is applied.

FIG. 2 is a right side view of the printer in which the auxiliary frame and the winding mechanism are removed.

FIG. 3 is an enlarged side view of a main part of the printer for explaining the paper guide member according to the first embodiment;

FIG. 4 is a perspective view of the paper guide member according to the first embodiment;

FIG. 5 is a perspective view showing attachment of a paper guide member to the hammer shaft and hammer guide of the above.

FIG. 6 is a schematic cross-sectional view of a main part showing a mounting state of the paper guide member 20 of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printer 2 Main body frame 3 Rotating frame 4 Auxiliary frame 5 Take-up drive part 6 Cassette mounting frame 7 Ink ribbon cassette 8 Left side frame 9 Right side frame 10 Support shaft 11 Lock lever 12 Paper feed roller 13 Paper feed drive part 14 Pressure contact Roller 15 Print drum 16 Print drive unit 17 Ribbon feed mechanism 18 Reduction gear train mechanism 19 Print drum shaft 20 Paper guide member 21 Hammer 21 'Head unit 22 Hammer shaft 23 Hammer spring 24 Hammer guide 25 Support leg 26 Paper guide surface 27 Swelling portion 28 Supporting part 29 Locking projection 30 Hammer storage concave part 31 Upper wall 32 Front wall 33 Right side wall of supporting part 34 Left side wall 35 Right side wall 36 Left side wall of supporting part 37 Engaging part 38 Nipping piece 39 Locking hole 40 Guide slit 41 Support plate Part 42 support hole 43 Inlet opening 44 the paper insertion port 45 ribbon arm 46 ink ribbon P sheets S1 reset sensor S2 character pulse sensor

Claims (4)

[Claims] 1. A paper guide member for guiding paper from above is disposed between a type drum and a hammer, and the paper guide member has a guide surface on an upper surface and a leg and a locking portion on a lower portion. The leg has a lower end as an engaging portion, the engaging portion detachably engages with the hammer shaft, and the locking portion is locked to the main body frame side to prevent rotation around the hammer shaft. Paper guide device. 2. The printer according to claim 1, wherein the paper guide member has a hammer receiving recess that covers an upper side of the hammer on a side facing the type drum. 3. A swelling portion is formed at an end of the guide surface of the paper guide member on the type drum side toward the type drum side, and the ink ribbon disposed between the hammer and the type drum is swelled. 2. The device according to claim 1, wherein the device is located below the portion.
Or the paper guide device according to 2. 4. The apparatus according to claim 1, wherein a cassette mounting portion is provided on the main body frame side adjacent to the paper guide member, and a guide surface of the paper guide member also serves as an ink ribbon guide for guiding the ink ribbon to a printing position. Any one of ~ 4
Paper guide device.