JPS5931414Y2 - Ink ribbon meandering prevention device for printing machines - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the difference in the frequency of use of the left and right sides of the ink ribbon (in the direction crossing the feeding direction) when winding a long ink ribbon from one winding shaft to the other winding shaft. This invention relates to an ink ribbon meandering prevention device for a printing machine that prevents meandering caused by partial expansion and contraction.

Conventionally, in this type of printing machine that uses a long and thin strip-shaped ink ribbon, when printing starts from the left end, finishes printing halfway through that line, and moves on to the next line, for example, the left side of the ink ribbon becomes the right side. When it is wound up, the ink ribbon will gradually meander towards the side with less shrinkage (to the right). There were drawbacks such as the meandering gradually increasing during repeated use and the edge of the ink ribbon coming off from the printing area, making it impossible to print in that area, but this invention overcomes the above drawbacks with a simple structure. The purpose is to eliminate the problem.

An embodiment of this invention will be explained below with reference to the drawings. Fig. 1 is a longitudinal sectional view of the printing machine in the operating state, and Fig. 2 shows the machine frame 1 in which the ink ribbon T and paper W are replaced, attached and detached, etc. Remove the cover 40 from the shaft 2 and release the appropriate latch (not shown) to move the support 3 from the state shown in FIG. 1 to the shaft 2.
, 2' is a perspective view of the state rotated in the direction of arrow A with the support 3 having a plurality of type letters arranged at equal intervals on the circumference and arranged at equal intervals in the direction of the rotation axis. The printing drum 4 is provided to rotate appropriately in conjunction with a drive source (not shown), and the ink ribbon T is rotated so as to be wound from one side to the other and from the other to the other in connection with printing. Two winding shafts 5 and 6 are provided parallel to each other.

Further, a plurality of guide rods 7, 8.9 and a first guide body 10 are installed on the support body 3 on the moving path of the ink ribbon T, and the ink ribbon T is moved in cooperation with the first guide body 10. A second guide body 11 parallel to the first guide body 10 is provided so as to be pressed against the first guide body 10 by the elastic force of a coil spring 23 which will be described later.

The machine frame 1 has a plurality of units 14 that face the print surface of the print row in the direction of the rotational axis of the printing drum 4 and that come out and retract from the opening 13 of the inner wall 12 to strike the desired print surface. Upper and lower sets of sprockets 15 provided on the left and right sides, and holes provided on both sides of the paper W (not shown) are used to feed the paper W one line or multiple lines at a time after each line of printing via a marking mechanism and an appropriate control device. A paper feeding mechanism is installed which has a protrusion 20 that engages with the sprocket 15 and a feeding belt 16 which is passed over the sprocket 15.

As shown in Fig. 3.4, the rectangular ends 1B, 18' of the second guide body 11 having a conical recessed hole 17 are loosely fitted into the square holes 19, 19' formed in the lower part of the support body 3. , the conical head 22 of the support shaft 21 loosely fitted into the shaft hole 33 of the support body 3 so as to be movable in parallel with the first guide body 10 is connected to the first guide body 10 with respect to the concave hole 17 of the second guide body 11. An adjustment screw 36 and the head of the support shaft 21 are disposed facing each other and biased toward each other, and are screwable into the shaft hole 33 so as to push the head 22 of the support shaft 21 into the recessed hole 17 of the second guide body 11. The second guide body 11 can be removed from the support body 3 by compressing the coil spring 23 between the part 22 and pulling the handle 24 to move the support shaft 21 against the coil spring. The coil spring 23 is provided so that the pressure of the coil spring 23 can be adjusted by turning the coil spring 23 to move it in and out from the shaft hole 33.

The second guide body 11 has an elastic comb-like paper presser body 28.
The lower end of the partition body 27 is fixed with screws 29 so as to overlap with the base of the partition body 27 .

The partition body 27 is made of a flexible synthetic resin such as cloth, and has a central part...so that when the printer unit 14 hits the type on the printing drum 4, the paper W and the inner ribbon T in the corresponding part can be joined. In addition to providing long holes 25 corresponding to the lines of printing,
A suitable reinforcing member 26 is secured to the edge.

Further, a downward hook 32 with a weak magnet 31 fixed to the inside is provided at the upper end of the partition body 27 in correspondence with an upward hook 30 made of a magnetic material provided on the support body 3.
is constructed so that it can be easily attached to and detached from the support body 3.

This device has the above-mentioned configuration. To operate the printing machine, remove the cover 40, release the appropriate latches as shown in FIG. After passing and setting the guide rods 7, 8° 9 and the first guide body 10, the second guide body 11 is supported on the support body 3, and the space between the first guide body 10 and the second guide body 11 is set. The ink ribbon T is sandwiched between the ink ribbons T and a certain passage resistance is applied to the ink ribbon T.

That is, as shown in FIGS. 3 and 4, the head 22 of the support shaft 21 is pushed into the square holes 19, 19' against the coil spring 23, and the concave hole 17 of the second guide body 11 is inserted into the head 22. If you fit it in,
During the engagement between the head 22 and the hole 17, a component force P of the coil spring 23 is applied.
acts in the direction of the arrow, and the second guide body 11 acts on the first guide body 1.
Pressed to 0.

Next, fit the hole of the paper W into the protrusion 20 of the feed belt 16, and fit the hook 32 of the partition body 27 into the hook 30 of the support body 3.
After fitting the hooks, turn the support 3 in the opposite direction of arrow A to fix it, and cover with the cover 40 to prepare the state shown in FIG.

As a result, the paper W is lightly pressed against the left side of the internal dust 12 in FIG. interposes and is separated leaving the printed portion, thereby preventing the ink ribbon T from staining the paper W.

In addition, when the support body 3 is closed to the operating state, the partition body 27
The hook 32 moves upward while being hung on the hook 30,
Since the middle of the partition 27 conforms to the arc of the print drum 40, the printed characters on the print drum 40 are prevented from hitting the partition 27 and generating unpleasant vibration noise.

When the printing machine is operated from the state shown in FIG.
At the same time as printing the desired characters on the paper W, the sprocket 1
5 rotates clockwise in FIG. 1 to move the paper W in the direction of arrow B one line or a plurality of lines at a time.

Also, in relation to the end of printing of each line, the winding shafts 5 and 6
rotates in the counterclockwise direction in FIG. The direction is reversed, and the ink ribbon T is wound from the winding shaft 5 to the winding shaft 6.

At this time, if the printing is concentrated on the left side, the ink ribbon T
The left side of the ink ribbon T shrinks and is wound around the winding shaft 5 or 6 more tightly than the right side, causing the ink ribbon T to meander to the right. The ink ribbon T
When the ink ribbon T passes between the first guide body 10 and the second guide body 11, the folds exert a strong passage resistance on the right side of the ink ribbon T, so that the ink ribbon is pushed back to the left side.

This effect will be more effective if the spring pressure on the right side is strengthened when the printing is concentrated on the left side, and if the spring pressure on the left side is strengthened when the printing is concentrated on the right side.

Therefore, by operating the adjusting screw 36 to adjust the force P of the second guide body 11 in FIG. 4 and balancing the above-mentioned two forces, the ink ribbon T can be wound up on the winding shafts 5 and 6 in an orderly manner.

Furthermore, even if the support body 3 is opened as shown in FIG. 2 when replenishing or inspecting the paper W, the ink ribbon T is covered with the partition 27, so the paper W and the worker's clothes will not be covered with ink. This prevents the ribbon T from getting dirty by touching it, and the partition body 2
Since the support 7 is engaged with the support 3 by the hooks 32 and 30 and is also attracted by the magnet 31, it will not easily fall off unless these are removed manually.

As described above, this invention uses elastic force to constantly press the second guide against the fixedly arranged first guide, which allows ink to flow in the opposite direction to the meandering direction caused by shrinkage of the ink ribbon. The force that returns the ribbon is always acting,
Since the ink ribbon T can be wound up in an orderly manner without meandering in the axial direction of the winding shaft, accidents such as printing errors can be prevented.

Note that FIG. 5 shows another embodiment.

That is, the support shaft 34 on which the first guide body 10' is fixed to the support body 3 of the above embodiment is loosely fitted into the groove 35 of the second guide body 11' which has a counterbore 41 in its upper part, and the support shaft The cylindrical body 37 is loosely fitted into the support shaft 34, and the adjustment screw 3 is screwed onto the support shaft 34.
A coil spring 39 is compressed and placed between the cylindrical body 3 and the cylindrical body 3.
67, and the cylindrical body 37 is moved upward in FIG. 5 against the coil spring 39 to remove the lower end from the counterbore 41. The same effect as described above can also be obtained by making it possible to remove the second guide body 11' from the support shaft by moving the second guide body 11' backward in the plane of the drawing.

[Brief explanation of the drawing]

Figure 1 is a longitudinal section of the printing machine showing the relationship between the ink ribbon, paper, and partitions, Figure 2 is a perspective view of the printing machine during preparation work, and Figure 3 is the first guide, second guide, and A perspective view of the partition, FIG. 4 is a sectional view showing the relationship between the second guide and the support shaft, FIG. 5 is another embodiment corresponding to FIG. 4, and FIG. 6 is a side view of the hook of the partition. It is a diagram. In the figure, 1 is the machine frame, 3 is the support, 4 is the printing drum, 5, 6
1 is a winding shaft, 10 is a first guide body, 11 is a second guide body, 1
4 is a hammer integrated, 21 is a support shaft, 23 is a coil spring, 2
7 is a cutting body, 28 is a paper presser, W is paper, and T is an ink ribbon.

Claims (1)

[Claims for Utility Model Registration] A plurality of strings of type that rotate in conjunction with a drive source and are arranged at equal intervals on the circumference, arranged at equal intervals in the direction of the axis of rotation 1
a paper feeding means 15, 16 for transporting a long and narrow sheet of paper along the type surface of the print drum; It is equipped with ink ribbon feeding means 5 and 6 for transporting the ink ribbon, and a plurality of rollers 14 that are capable of coming into contact with and separating from the print surface of the print drum via the ink ribbon and paper, and that face the print surface of the print row in the direction of the rotation axis. In a printing machine, a pair of shaft-shaped guide bodies 10 and 11 are arranged so as to sandwich the transfer surface of the ink ribbon and extend parallel to the transfer surface, straddling both sides of the ink ribbon so that they can come into contact with and separate from each other. A pair of pressing means 21, 23, 36, 37, 38 having an elastic force that acts on both ends of one guide to press the guide against the other guide, and whose strength can be changed individually. ,39
An ink ribbon meandering prevention device for printing machines equipped with