JPH11105364A - Printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate installation and enhance installation efficiency by inserting a reel unit assembled beforehand from a winding side ink ribbon reel and a feed side ink ribbon reel from behind a main body frame, and fastening a supporting panel to a rear wall with screws. SOLUTION: After a front bearing is mounted in a supporting hole 48 of a front wall 17, the whole of an assembled part of a reel unit 23 is inserted to penetrate from an insertion hole 47 of a rear wall 18. A center shaft 35 is set front at this time. A friction coupling 22 is located between the front wall 17 and rear wall 18 and, a supporting panel 24 of a rear end part butts against a rear face of the rear wall 18. The supporting panel 24 is fastened to the rear wall 18 with screws, and a third C ring is fitted to the center shaft 35 in front of the front bearing. Thereafter, a bobbin 36 is inserted and fastened to the center shaft 35 with screws from the front of the front wall 17. The reel unit 23 at the wind side is thus completely mounted. A friction panel 49 is inserted to the center shaft 35 rotatably.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing machine, such as a tag printing machine, which performs printing by loading an ink ribbon wound on a roll onto a ribbon reel.

[0002]

2. Description of the Related Art In a printing machine in which an ink ribbon wound on a roll is loaded on a ribbon reel and printing is performed, ribbon reels on a take-up side and a supply side are provided at right angles to project from a vertical portion of a main body frame. In many cases, the center axis is rotatably supported at one end on the frame side in a cantilever manner. In this structure, it is necessary to attach all the gears that constitute the drive mechanism of the take-up ribbon reel and the tension mechanism of the supply-side ribbon reel, or the main and driven wheels for friction coupling to the rear end (frame side) of the center shaft. is there.

For this reason, the vertical portion of the main body frame is constituted by a front wall and a rear wall which are arranged at an interval, and the drive mechanism and the tension mechanism are constituted between these walls.
Furthermore, in consideration of the design and ease of use as a printing machine, for example, other mechanism members such as a lever mechanism for moving the print head up and down and a driving motor are all disposed between the front wall and the rear wall. It is preferable to assemble.

However, since the distance between the front wall and the rear wall is small and the tool does not reach deep inside, when assembling the ribbon reel to the main body frame, the position between the front wall and the rear wall is set at the same time when the rear wall is attached to the front wall. All the parts to be assembled are assembled at once, and the assembly requires some skill. This problem can be solved to some extent by mounting each part individually to the front wall using its own support member, or by making the rear wall with many work cutouts, but the number of parts and the installation time will increase. In addition, there arises a problem that the strength of the rear wall as the pivot portion is reduced. When the drive mechanism, the tension mechanism, and the like are not disposed between the front wall and the rear wall of the main body frame vertical portion, these problems are reduced. However, when the number of parts is large, a problem that requires labor is left.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a printing machine for performing printing by loading an ink ribbon roll onto a ribbon reel without impairing the strength of the vertical portion of the main body frame, and more particularly, by applying the ribbon reel to the main body frame. An object of the present invention is to provide a printing machine that can be easily mounted.

[0006]

A printing machine has a main body frame composed of a horizontal portion and a vertical portion. Further, the central axes of the take-up ribbon reel and the supply-side ribbon reel are projected forward at right angles from the vertical portion, and the rear end portion is rotatably supported at the vertical portion. Attach the bobbin for roll to the part. Then, a friction coupling having a main driving wheel and a driven wheel whose rotational power is coupled to the rear end of the central shaft by frictional force is assembled in advance integrally to constitute a reel unit. The friction coupling includes a main driving wheel and a driven wheel to which rotational power is coupled to the rear end of the central shaft by frictional force. The reel unit is projected from the vertical portion of the main body frame of the printing machine, and the take-up ribbon reel and the supply-side ribbon reel are attached to the main body frame.

In the take-up ribbon reel, the center shaft on which the roll bobbin is mounted is driven by some means, so that the main driving wheel in the friction coupling is a gear or a pulley driven by a motor or the like, and the driven wheel is such a pulley. This is a disk that rotates with the main driving wheel by frictional force. Note that the main driving wheel is rotatable with respect to the central axis, and the driven wheel is fixed to the central axis. Therefore, the main driving wheel drives and rotates the central axis via the driven wheel.

On the other hand, in the supply-side ribbon reel, since the center axis is rotated by the tension of the ink ribbon transmitted through the roll bobbin, the disk fixed to the center axis is the main driving wheel. A disk that is coupled to this by frictional force and is rotatable with respect to the central axis becomes a driven wheel. The driven wheel is biased by a spring or the like in a direction that resists the direction in which the driven wheel is to be rotated by frictional coupling with the main driven wheel. The degree of bias is such that slack when the ink ribbon is rewound is eliminated, and a structure in which a slip occurs on a friction surface between the main driving wheel and the driven wheel at a predetermined torque or more.

The main drive wheel of the friction coupling in the take-up side ribbon reel is rotatably attached to the center axis, and is usually driven by a motor provided on the frame side in many cases. The driven wheel of the friction coupling in the supply ribbon reel is often biased by a spring at a predetermined torque limit.

The vertical portion of the main body frame may be formed by a front wall and a rear wall which are arranged at intervals. in this case,
A friction coupling and a support plate are attached to the center axes of the take-up ribbon reel and the supply-side ribbon reel, respectively, to form a reel unit, which is inserted through a mounting hole provided in the rear wall so that the central axis projects from the front wall. Further, the reel unit is attached to the main body frame by fixing the support board to the rear wall. The friction coupling is disposed between a front wall and a rear wall forming a vertical portion of the main body frame.

[0011]

FIG. 1 shows a printing machine 1 for printing on a tag, with a cover removed. Sign 2
Is a sheet, which is made up of a tag 4 which is a continuous tag 3 and is supplied from a roll attached to a reel.

In the printing machine 1, a transport path for the paper 2 is set in the horizontal portion 6 of the main body frame 5, and a guide roller 7, a paper width guide 8, a tag position detector 9, The platen roll 10, the print head 11, and the paper cutter 12 are all arranged in a direction crossing the transport path. A take-up side ink ribbon reel 14, a supply side ink ribbon reel 15, and a ribbon guide bar 16 for mounting an ink ribbon are all supported on one end side of the vertical portion 13 of the main body frame 5 at the upper part of the transport path. I have.

The vertical portion 13 of the main body frame 5 has a front wall 17.
And the rear wall 18 is firmly formed with a structure fixed with a space therebetween. The guide roller 7 can move up and down the front end around the shaft end on the vertical portion 13 side, and when setting the paper, lift the front side upward to make it easier to load the paper. . The front shaft end of the guide roller 7 is manually detachable from the horizontal portion 6 of the main body frame 5. The paper width guide 8 can be pushed and pulled in a direction orthogonal to the transport path. When setting the paper 2, pull it to the front side to the limit, set the paper 2, push it in, and adjust it to the paper width.

The tag position detector 9 is a member in which an upper portion and a lower portion are integrally connected in a U-shape, and the sheet 2 passes along with the tag 4 between the upper portion and the lower portion. And
A photoelectric sensor is formed over the upper part and the lower part. The photoelectric sensor is configured to detect the threading hole 19 provided in the tag 4 and determine the print timing by grasping the relationship between the tag position and the print position. . The tag position detector 9 can also be moved by pushing and pulling in the direction orthogonal to the sheet conveying direction.
Push the sheet 2 out of the way to prevent it from getting in the way. After setting the sheet 2, pull it out and return it to the original detection position.

The print head 11 is constructed inside the main body frame 5, and can be moved up and down by a link mechanism 21 (FIG. 2) operated by a handle 20 arranged on the front of the horizontal portion 6. The print head 11 is a thermal transfer head and comes into contact with the platen roller 10 when it moves downward. The paper cutter 12 at the end of the transport path is used to cut the printed paper 2 into a predetermined size. However, the paper cutter 12 is often not used if the paper 2 has a form in which the tag 4 is attached to the separate paper 3.

The take-up side ink ribbon reel 14 is configured as a reel unit 23 having a friction coupling 22 (FIGS. 3 to 6). That is, the reel unit 23
From the rear, a support plate 24 (FIG. 6), a first C ring 25,
A rear bearing 26, a pressure adjusting wheel 27, a coil spring 28, a first driven wheel 29, a main driven wheel 30, a second driven wheel 31,
The friction coupling 22 including the second C ring 32, the front bearing 33, the third C ring 34, and the central shaft 3
5. A bobbin 36 is provided. The second driven wheel 31 is fitted to the central shaft 35, fixed to the central shaft 35 by the second C ring 32, the main driven wheel 30 is rotatably fitted, and the first driven wheel 29 is further fitted to the center. The pressure adjusting wheel 2 is mounted on the shaft 35 so as to be non-rotatable but slidable in the axial direction, and a coil spring 28 is fitted on the rear surface thereof.
Press with 7.

The pressure adjusting wheel 27 is screwed into a threaded portion 37 engraved on the rear end of the center shaft 35. When the pressure adjusting wheel 27 is rotated with a fingertip or the like, the coil spring 28 causes the first driven wheel to rotate. 29
Can be adjusted. Next, the support board 24 is fitted, the center shaft 35 is rotatably supported on the support board 24 via the rear bearing 26, and the rear bearing 26 is fixed to the support board 24 by the first C ring 25.

The surfaces of the first driven wheel 29 and the second driven wheel 31 on the side of the main driven wheel 30 are provided with felts 38 for adjusting frictional force.
The first driven wheel 29 forms an encoding edge 40 having a notch on the rear surface. In addition,
A detection element 41 is arranged close to the encoding edge 40. The encoding edge 40 and the detecting element 41 are for monitoring the rotation speed of the take-up reel 14 and detecting the cutting of the ink ribbon R.

In this embodiment, the main driving wheel 30 is a spur gear and always meshes with a small gear 42 on the driving side. The small gear 42 is interlocked with an intermediate gear 44 via a timing belt 43 (FIG. 2), and the intermediate gear 44 is a motor 45
Gear 4 for driving and rotating the platen roll 10 driven by the
6 is engaged. The gear interlocking configuration is platen roll 1.
The winding speed of the ink ribbon R by the winding-side ink ribbon reel 14 slightly exceeds the peripheral surface speed of zero. Accordingly, the main driving wheel 30 is driven in a state where the speed is always increased from the feeding amount of the platen roll 10 with the printing operation.

The vertical portion 13 of the main body frame 5 has an insertion hole 47 in the rear wall 18 and a support hole 47 in the front wall 17. The diameter of the insertion hole 47 is smaller than the diameter of the support board 24 and larger than the diameter of the pressure adjusting wheel 27 and the main driving wheel 30. The center of the insertion hole 47 and the support hole 48 are on the same axis in a direction orthogonal to the vertical portion 13. In this case, the front wall 17 and the rear wall 18 are formed by pressing the insertion hole 47, the support hole 48, and the like into a single plate as a whole. When the front wall 17 and the rear wall 18 are combined, one strong box is formed. Form a shaped structure.

The assembly assembled as described above, the remaining front bearing 33, the third C ring 34 and the bobbin 36 constitute the reel unit 23. And the front wall 1
7, the front bearing 33 is attached to the support hole 48, and the whole of the assembled portion of the reel unit 23 is inserted from the insertion hole 47 of the rear wall 18 with the center axis 35 as the front, and the center axis 35 is Insert and penetrate the bearing 33. Thereby, the friction coupling 22 is located between the front wall 17 and the rear wall 18, and the support plate 24 at the rear end abuts on the rear surface of the rear wall 18.

The support plate 24 is screwed to the rear wall 18, and the third C ring 3 is attached to the center shaft 35 in front of the front bearing 33.
4 is attached. Next, the bobbin 36 is inserted into the center shaft 35 from the front of the front wall and screwed, thereby completing the installation of the reel unit 23 on the winding side.

The supply side ink ribbon reel 15 is shown in FIG.
As shown in FIG. 5, it has almost the same configuration as the take-up side ink ribbon reel 14, and the same components are denoted by the same reference numerals and detailed description thereof will be omitted. The supply-side ink ribbon reel 15 is different from the winding-side ink ribbon reel 14 in that the main-wheel 3
0 is a gear driven by the motor 45, whereas the supply-side ink ribbon reel 15 is a friction plate 49 that is not driven by the motor, and includes a tension spring 50. In the winding-side ink ribbon reels 14 on both front and rear sides, driven wheels 29 and 31 provided with felts 38 and 39 are main driven wheels 29 and 31 driven by the tension of the ink ribbon.

That is, the friction plate 49 is a driven wheel rotatably fitted on the center shaft 35 and driven by the main driving wheels 29 and 38 on both front and rear sides. The tension spring 50 always pulls the friction plate 49 on the side opposite to the direction in which the friction plate 49 is driven by friction with the main driving wheels 29 and 31.
However, the tension is such that the slack of the ink ribbon R is eliminated. Accordingly, when the ink ribbon R is pulled out with a torque greater than the tension of the tension spring 50, the main driving wheels 29 and 31 can rotate by causing a slip with the friction plate 49. Since the main driving wheel 29 uses the same member as the take-up side ink ribbon reel 14, the main driving wheel 29 is provided with the encoding edge 40 and the detection sensor 41, but may not be used.

With the above configuration, when the printing machine 1 is operated, the paper 2 is guided by the guide roller 7 and is conveyed between the platen roll 10 and the print head 11 through the space between the tag position detectors 9. Is done. At this time, the print head 11 is lowered and the paper is sandwiched together with the ink ribbon R between the print head 11 and the platen roll 10, and printing is performed by thermal transfer. The transport of the paper 2 and the ink ribbon R is mainly performed by rotation of the platen roll 10.

As for the ink ribbon R, the rotation of the platen roll 10 causes the ink ribbon R to be pulled out.
Is a place where the supply-side ink ribbon 15 is slackened when rotated by inertia.
Since a moderate tension is always given by
There is no sagging. Further, the ink ribbon R sent out from the printing position is always tensioned by the rotation of the small gear 42 by the motor 45 at an increased speed, so that the ink ribbon R can be wound smoothly without slack. Although the embodiment in which the vertical portion 13 of the main body frame 5 is constituted by the front wall 17 and the rear wall 18 has been described above, the vertical portion 13 may be a single plate corresponding to the rear wall. In this case, the friction coupling 22 and the like protrude to the rear side of the plate. The plate must be sturdy.

[0027]

The take-up side ink ribbon reel and the supply side ink ribbon reel need only be inserted into the reel unit in advance from the rear of the main body frame and screwing the support plate to the rear wall. Easy to assemble, improving the efficiency of assembly work.

Since the basic structure of the ink ribbon reels on the winding side and the supply side is the same, parts are common to both reels.
The number of parts required for the printing machine can be reduced. Since the vertical portion supporting the pivots of the various shafts and levers can have a substantially box-shaped structure including the front wall and the rear wall, the main body frame can be formed firmly.

[Brief description of the drawings]

FIG. 1 is a perspective view of a printing machine with a cover removed (front side).

FIG. 2 is a perspective view of the printing press shown with a cover removed (rear side).

FIG. 3 is a side view showing a friction coupling portion of the ink ribbon reel (partial cross section).

FIG. 4 is an exploded perspective view showing a main part of the ink ribbon unit (winding side).

FIG. 5 is an exploded perspective view showing a main part of the ink ribbon unit (supply side).

FIG. 6 is a perspective view showing a relationship between a center axis, a bobbin, and a support board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tag printing machine 2 Paper 3 Separate paper 4 Tag 5 Body frame 6 Horizontal part 7 Guide roller 8 Paper width guide 9 Tag position detector 10 Platen roll 11 Print head 12 Paper cutter 13 Vertical part 14 Winding side ink ribbon reel 15 Supply Side ink ribbon reel 16 Ribbon guide bar 17 Front wall 18 Rear wall 19 Threading hole 20 Handle 21 Link mechanism 22 Friction coupling 23 Reel unit 24 Support board 25 1st C ring 26 Rear bearing 27 Pressure adjusting wheel 28 Coil spring 29 First Driven wheel 30 Main driven wheel 31 Second driven wheel 32 Second C-ring 33 Front bearing 34 Third C-ring 35 Center shaft 36 Bobbin 37 Screw 38 Felt 39 Felt 40 Encoding edge 41 Detector 42 Small gear 43 Timing gear Rott 44 Intermediate gear 45 Motor 46 Gear 47 Insertion hole 48 Support hole 49 Friction disc 50 Tension spring

Claims (4)

[Claims] 1. A body frame comprising a horizontal portion and a vertical portion,
The central axes of the take-up ribbon reel and the supply-side ribbon reel are projected forward from the vertical portion at right angles, and are rotatably supported on the vertical wall. A friction coupling having a main driving wheel and a driven wheel to which rotational power is coupled by frictional force is attached to a rear protruding portion of the main shaft, and the center shaft and the friction coupling are preliminarily integrated as a reel unit. A printing machine characterized by the following. 2. A vertical unit is constituted by a front wall and a rear wall, and a reel unit is further configured to include a support plate by a center axis being previously supported by a support plate. That the center axis protrudes from the front wall by inserting from the insertion hole provided on the main frame, and that the take-up ribbon reel and the supply-side ribbon reel are attached to the main body frame by fixing the support board to the rear wall. The printing machine according to claim 1, characterized in that: 3. A main driving wheel of a friction coupling in a take-up side ribbon reel is rotatably attached to a center axis, and is driven by a motor provided on a frame side. 3. The printing machine according to claim 1, wherein 4. The apparatus according to claim 1, wherein the driven wheel of the friction coupling in the supply-side ribbon reel is biased by a spring in a direction opposing the rotation of the main driven wheel at a predetermined torque limit. The printing machine according to any one of the above.