JPH0228053Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Technical field of the invention This invention relates to a printing device that automatically prints characters such as manufacturing date, weight, amount, etc. on packaging resin films that are continuously transported. In particular, the present invention relates to an improvement of a hot roll printer that heats a printing roll.

(b) Prior art and problems In hot roll printers, the printing roll and printing type are heated to 120 to 150°C, and the ink adhering to the surface of the type is continuously transferred through contact with the ink roll, such as a resin film. It is possible to transfer the image reliably and well on the printing target material and print it.

Such a printing device is already known in U.S. Pat. No. 58-45154 proposed by the applicant of the present invention.

Further, the ink roll of this type of printer needs to be constantly heated while the printer is in use so that the ink impregnated into the ink roll has fluidity. Furthermore, the printing surface of the printing type set on the printing roll is not necessarily a uniform plane, and in many cases, it is normal that it does not match due to molding errors of the type, installation errors, etc. The amount of ink transferred to the printed surface of the type varies slightly depending on the size of the type, the thickness of the lines, the type of character, and variations in the outer shape of the ink roll. For this reason, it is desirable that the distance between the ink roll and the type can be finely adjusted.

However, although the printing device disclosed in Utility Model Application No. 58-45154 is equipped with a fine adjustment mechanism, it has a link structure, so the structure is complicated and the support of the ink roll may become unstable. There was a problem that fine adjustment between the ink roll and the type could not be made accurately.

(C) Purpose of the invention This invention was devised to solve the above-mentioned conventional problems.The purpose of this invention is to make it possible to accurately and finely adjust the spacing between the characters on the ink roll and the printing roll, and to make it simple. To provide a printing device which can be stably supported by an ink roll support mechanism.

(d) Structure of the invention In order to achieve the above object, this invention includes a printing roll and an ink roll impregnated with hot-melting ink that is placed in opposition to the printing roll and transfers the ink to the printing surface of the printing roll. a clutch/brake unit that rotates and stops the printing roll and ink roll in accordance with the printing timing on the printing target material; and an encoder that converts the feeding amount of the printing target material into a unit length pulse. The ink roll is rotatably attached to an arm member pivotally connected to the fixed side so as to be rotatable in the vertical direction, and an adjustment knob for finely adjusting the relative distance between the ink roll and the printing roll is provided on the fixed side. The adjustment knob is rotatably provided, and an eccentric portion provided on the adjustment knob is fitted into an elongated hole formed on the rotation side of the arm member.

(E) Examples of the invention Examples of the invention will be described below with reference to drawings.

Figures 1 to 6 show an example of a printing device according to this invention, in which 1 is a hot type printing roll, 2 is a hot type printing roll;
is an ink roll located above and parallel to this printing roll, and these printing roll 1 and ink roll 2 are supported by a single support substrate 3.

The printing roll 1 has a main shaft 4 that passes through a vertical support substrate 3 at right angles, as shown in FIG. A timing pulley 7 is attached to one end of the timing pulley 7, and a flange 8 is attached to the other end. One end of a heat sleeve 9 arranged concentrically with the main shaft 4 is fixed to the flange 8, and the other end of the heat sleeve 9 is fixed to the flange 8.
Bolts 1 are attached to the support substrate 3 via the heat insulating member 10.
It is rotatably supported by a flange 12 fixed by 1 via a ball bearing 13. Inside the heat sleeve 9, a printing roll heating heater 14 consisting of a ring-shaped heater box 14a and a replaceable cartridge heater 14b embedded in the heater box 14a is arranged concentrically with the main shaft 4. One end is integrally fixed to the flange 12 on the support substrate 3 side via a heat insulating member 15, and the cartridge heater 14b is
It is connected to a power supply device (not shown) by a lead wire 14c passing through the support substrate 3 and flange 12.

A cylindrical printing type holder 16 is removably fitted to the outer periphery of the heat sleeve 9.
This type holder 16 is provided with a flange 17 at its opposite end, and the center hole 17a of the flange 17 is connected to the boss portion 8a of the flange 8 of the heat sleeve 9.
The tip of the click stop mechanism 18 provided on the flange 17 engages with the ring groove 8b formed in the boss portion 8a, thereby closing the type holder 1.
6 is held in the heat sleeve 9, and the flange 1
By engaging the positioning pin 17a provided at 7 with the pin hole 8c of the flange 8, the type holder 16 is positioned and fixed in the circumferential direction with respect to the heat sleeve 9. A knob 19 for inserting and removing the type holder 16 is integrally attached to one end surface of the flange 17. Further, a type mounting hole 20 extending in the axial direction is formed on the outer periphery of the type holder 16, and a type 21 for printing to display date, weight, amount, etc. is formed in this mounting hole 20. Replaceably installed.

The ink roll 2 is made of open-cell urethane foam, and is impregnated with hot-melt ink. Further, as shown in FIGS. 4 to 6, the ink roll 2 is attached to the ink roll shaft 22 via a sleeve 60 so as to be slidable in the axial direction.
One end is rotatably attached to a bearing 62 fixed to the arm member 61, and the arm member 61
The base is pivotally connected to a shaft pin 63 protruding from the support substrate 3 via a boss portion 64 so as to be rotatable in the vertical direction (direction toward and away from the printing roll 1). Further, an elongated hole 65 is bored on the rotation side of the arm member 61 remote from the pivot base.
A clamp pin 66 is installed perpendicularly to the support substrate 3 through the clamp pin 66, and an adjustment knob 67 is rotatably attached to the clamp pin 66. A fine adjustment eccentric part 68 that fits into the clamp pin 66 is integrally formed, and a clamp screw 69 that fixes the adjustment knob 67 at the adjustment position is screwed into the protruding tip of the clamp pin 66. A cover 2a covering the ink roll 2 is fixed to the arm member 61, and a heater 70 is installed in the cover 2a to melt the impregnated ink and improve the fluidity of the ink. Reference numeral 71 denotes an operating knob attached to one end of the sleeve 60, and this knob 71 is provided with a click stop mechanism 73 that engages with a groove 72 formed in the ink roll shaft 22. Therefore, the knob 71 is
By operating in the direction of arrow B in the figure, the ink roll 2 is slid in the axial direction, the contact position of the ink roll 2 with the type 20 is changed, and the impregnated ink can be used without wasting it. 23
is a pulley, and 74 is a heat insulating sheet.

Reference numeral 24 denotes a clutch/brake unit located above the ink roll 2 and attached to the support base plate 3, and as shown in FIG. It has an input shaft 26 passing through the top parallel to the main shaft 4, and an output quill shaft 27 arranged concentrically around the outer periphery of the input shaft 26. One end of the input shaft 26 is connected to a bearing attached to the housing 25. 28 and the quill shaft 27
The protruding end side of the bearing 2 attached to the housing 25
a timing pulley 30 provided at the inner end of the housing 25 of the quill shaft 27 and at the protruding end of the quill shaft 27;
A bearing 3 is provided between the input shaft 26 and the input shaft 26 facing each other.
1 and 32 are interposed therebetween, so that the input shaft 26 and the quill shaft 27 can rotate relative to each other. Further, in the housing 25, an electromagnetic clutch 33 that connects and connects the input shaft 26 and the quill shaft 27, and an electromagnetic brake 34 that brakes the quill shaft 27 are provided concentrically with the input shaft 26 and along the axial direction. The electromagnetic clutch 33 is composed of a coil 33a, an armature 33b and a clutch disk 33c, and the electromagnetic brake 34 is composed of a coil 34a and a brake disk 34b. An encoder 35 is connected to the other end of the input shaft 26 via a coupling 37, and converts the feed amount of the printing member 38 into an electrical signal.

A timing belt 39 is wound around the timing pulley 7 and the timing pulley 30, and the back side of the timing belt 39 is wound around the pulley 23 of the ink roll 2. 40 is a tension pulley of the belt 39.

Further, in FIG. 1, reference numeral 41 denotes a print receiving roll disposed at the lower part of the printing roll 1, and a printing member 38 such as a resin film is placed on the printing receiving roll 41 for more than half a turn via guide rolls 42 and 43. When the printing target member 38 is moved in the direction of arrow X by a field device (not shown), the print receiving roll 41 is rotated in the direction of arrow A. Further, 44 is a mark sensor that detects a registration mark 45 formed on the printing target member 38. 46 is the shaft 41a of the print receiving roll 41
47 is a bevel gear attached to the input shaft 26. Both bevel gears 46, 47
bevel gears 4 attached to both ends of the rotation transmission shaft 48.
9a and 69b are meshed with each other, thereby transmitting the rotation of the feed roll 41 to the input shaft 26.

FIG. 7 shows an example of the printing control circuit according to the present invention, which includes a counter 50 that counts pulse signals sent from the encoder 35, and a printing member 3 by presetting the contents of this counter 50.
Counter setter 51 that determines the print position for 8
is set by the output signal of the mark sensor 44, and the counter 50 is set by the set output.
a flip-flop 52 that performs a counting operation; and a flip-flop 54 that is set and operated by the output signal from the fixed position stop detection means 53 of the printing roll 1.
and this flip-flop 5
The base of a transistor 55 that controls the electromagnetic brake 34 is connected to the set output terminal Q of the flip-flop 54, and the base of a transistor 56 that controls the electromagnetic clutch 33 is connected to the reset output terminal of the flip-flop 54. Further, the flip-flops 52 and 54 are reset by the count-up signal of the counter 50. Furthermore, the printing roll fixed position stop detection means 53 includes a disk 53a attached to the main shaft 4.
and a photoelectric switch 53c that detects a notch 53b formed in the disc 53a.

Next, the operation of this embodiment configured as described above will be explained.

When the power is turned on, first, flip-flops 52 and 54 of the control circuit shown in FIG. 7 are reset. As a result, the Q output of the flip-flop 54 becomes "L", so the transistor 55 is turned off, the electromagnetic brake 34 is placed in a demagnetized state, and the quill shaft 27 is placed in a rotatable state.

On the other hand, the output of flip-flop 54 is "H"
Therefore, the transistor 56 is turned on,
As a result, the electromagnetic clutch 33 is energized, and the input shaft 26 and the quill shaft 27 are in a connected state.

Here, when the print receiving roll 41 is rotated in the direction of arrow A by transferring the printing member 38 in the direction of arrow X in FIG. The printing roll 1 and the disk 53a of the fixed position stop detection means 53 rotate through the gear 49a→shaft 48→bevel gear 49b→bevel gear 47→input shaft 26→electromagnetic clutch 33→quill shaft 27→pulley 7→main shaft 4. At this time, the encoder 35 is rotated with the rotation of the input shaft 26, and from now on, the unit length, for example, 1/1/2 of the feed amount of the printing target member 38.
A pulse signal is sent out every 2mm. Further, electric power is supplied to the heater 14 of the printing roll 1, and the heat sleeve 9 and the type 21 are kept at a predetermined temperature (120 to 150
℃), and as the belt 39 runs, the ink roll 2 is also rotated.

Then, as the disc 53a rotates, when the notch 53b faces the photoelectric switch 53c,
An output signal is generated from the photoelectric switch 53c, whereby the flip-flop 54 is set. Therefore, the Q output of the flip-flop 54 is inverted to "H" and the output is inverted to "L", turning on the transistor 55 and turning off the transistor 56, demagnetizing the electromagnetic clutch 33 controlled thereby, and demagnetizing the electromagnetic brake 34. energize. Therefore, the quill shaft 27 is braked and stopped at the same time as it is separated from the input shaft 26, and the printing roll 1 is stopped at a predetermined position. That is, the stopping position of the printing roll 1 is initially set.

Next, when the registration mark 45 is detected by the mark sensor 44 as the print target member 38 moves with the rotation of the print receiving roll 41, an output signal generated from the mark sensor 44 is applied to the flip-flop 52 as a print command. The flip-flop 52 is operated to set its Q output to "H", and the counter 50 is started. As a result, the counter 50 sequentially counts the pulse signals generated from the encoder 35 in accordance with the movement of the film, and measures the amount of movement of the film from the registration mark 45. Then, the count content of the counter 50 is determined by the count setting device 51.
When the counter 50 matches the preset count value, a signal is sent from the counter 50 and the flip-flop 5
2,54 is reset.

When the flip-flop 54 is reset, its Q output becomes "L", and at the same time as the electromagnetic brake 34 is released, the output is reversed to "H", thereby energizing the electromagnetic clutch 33 and connecting it to the input shaft 26. The quill shafts 27 are connected. For this reason,
The rotation of the quill shaft 27 is controlled by the pulley 30 and the belt 3.
9 and pulley 7 or pulley 23 to the printing roll 1 and ink roll 2, and as the printing roll 1 and ink roll 2 rotate, the printing roll 1
Ink adheres to the printed characters 21 from the ink roll 2, and the printed characters 21 face the print receiving roll 41 and come into contact with the printed member 38.
Printing is performed on the printing target member 38.

The printing roll 1 continues to rotate even after printing is completed, and when the notch 53b of the disc 53a comes to a position facing the photoelectric switch 53c, a stop command signal is sent from the photoelectric switch 53c, and the flip-flop 54 is set. As a result, the Q output of the flip-flop 54 is reversed to "H" and the output to "L", and at the same time the electromagnetic clutch 33 is disengaged, the electromagnetic brake 34 is energized to apply a sudden brake to the quill shaft 27, and the printing roll is 1 is stopped at the fixed position.

Thereafter, the same operation is repeated, and the printing member 38 is
It is possible to accurately print at a predetermined position from the position where the registration mark 45 is detected.

When finely adjusting the distance between the ink roll 2 and the type 20, loosen the clamp screw 69 and rotate the adjustment knob 67 in the direction of arrow C in FIG. Therefore, the arm member 61 is slightly rotated downward about the shaft pin 63, and the ink roll 2 is slightly moved in a direction in which it comes into strong contact with the type 20.

On the other hand, if the adjustment knob 67 is rotated in the direction of arrow D in FIG.
This results in a slight movement in the direction of weak contact with 0.

(f) Effect of the invention As explained above, according to this invention, the support arm member of the ink roll is pivotally supported on the fixed member (support board) so as to be rotatable in the vertical direction, and the eccentric part provided on the adjustment knob is Fits into the long hole of the arm member,
By rotating the adjustment knob, the eccentric part of the arm member is slightly rotated in the vertical direction to finely adjust the spacing between the type on the ink roll and the printing roll, so the fine adjustment can be made accurately. As a result, the amount of ink transferred from the ink roll to the printed surface of the type can vary even if there are variations in the size of the type, the thickness of the lines, the type of characters, the material of the printing object, or the external dimensions of the ink roll. Being able to finely adjust the amount of ink transferred to the printed characters increases the number of impressions possible per ink roll, and enables clear and clean printing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the entire printing device according to this invention, Fig. 2 is an enlarged sectional view of the printing roll portion in this invention, and Fig. 3 is an enlarged sectional view of the encoder and clutch/brake unit also in this invention. , Fig. 4 is an enlarged cross-sectional view of the ink roll part in this invention, and Fig. 5 is a - of Fig. 4.
FIG. 6 is a sectional view taken along the line - in FIG. 5, and FIG. 7 is a block diagram showing an example of the printing control circuit in this invention. 1...Printing roll, 2...Ink roll, 3...
...Support board, 4...Main shaft, 7...Timing pulley, 8...Flange, 9...Heat sleeve, 1
4...Roll heating heater, 15...Insulating material, 1
6... Type holder, 21... Printing type, 22...
... Ink roll shaft, 23 ... Pulley, 24 ... Clutch/brake unit, 25 ... Housing, 26 ... Input shaft, 27 ... Quill shaft, 30
...Timing pulley, 33...Electromagnetic clutch,
34... Electromagnetic brake, 35... Encoder, 3
9...Timing belt, 38...Printed member,
41... Print receiving roll, 44... Mark sensor,
45...Register mark, 50...Counter, 53...
... Fixed position stop detection means, 61 ... Arm member, 6
2...bearing, 63...shaft pin, 65...elongated hole, 6
6...Crank pin, 67...Adjustment knob, 68...
...Eccentric part.

Claims (1)

[Scope of utility model registration request] a printing roll; an ink roll impregnated with hot-melting ink that is placed in opposition to the printing roll and transfers the ink to the printing surface of the printing roll; A hot roll printer that has a clutch/brake unit that rotates and stops the ink roll at the same time, and an encoder that converts the feed amount of the printing target material into a unit length pulse, and is capable of vertically rotating the ink roll toward a fixed side. At the same time, an adjustment knob for finely adjusting the relative distance between the ink roll and the printing roll is rotatably attached to the arm member pivotally connected to the arm member, and an adjustment knob for finely adjusting the relative distance between the ink roll and the printing roll is rotatably provided on the fixed side. A printing device that fits into a long hole formed on the rotating side of the printer.