JPS6260997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method to prevent the pinch roller from moving when a long sheet of paper is being held between the paper feed roller and the pinch roller, and when a standard length sheet of paper is also being inserted between the two rollers. The present invention relates to a printing device in which a long sheet of paper is held down in place of a pinch roller by a paper holding member that moves in conjunction with a separation motion with respect to a paper feed roller.

When printing long sheets of paper such as journals, receipts, etc. and fixed-length sheets of paper such as slips, the long sheets of paper are held between the paper feed roller and the pinch roller, and then the fixed-length sheets of paper are separated. When attempting to insert the paper, the pinch roller and the paper feed roller must be separated from each other, which causes a problem in that the long paper is no longer held by both rollers and becomes misaligned. Another problem was that the distance between the platen and the print head was narrow, making it impossible to easily insert the standard size paper.

The present invention was made based on the above circumstances, and its purpose is to separate the fixed-length paper between the platen and the print head when printing on long paper such as journal receipts and fixed-length paper such as slips. The paper can be easily inserted between the platen and the print head, and the position of the long paper does not shift when inserting the paper between the platen and the print head. The object of the present invention is to provide a printing device that can perform overlapping printing.

Hereinafter, the configuration of the present invention will be explained with reference to embodiments shown in the drawings.

Figure 1 shows the general configuration of the whole.
is a motor, and a motor gear 2 and a pair of detection plates 3A, 4A are fixed to one end of a rotating shaft 1A of the motor 1 with the motor gear 2 in between. These detection plates 3A and 4A have a large number of cutouts on their peripheries at different and equal intervals, and in the vicinity of each detection plate 3A and 4A, the notch positions of each detection plate are marked. Detectors 3B and 4B are arranged, and as the motor 1 rotates, one detector 3B
is configured to output character pulses for dot printing at short-time intervals, and the other detection unit 4B outputs character pulses at long-term intervals. Note that these detectors 3B and 4B are fixed to the main body case 5, and one of them is selectively used depending on the size of the characters to be printed. In the figure, 6 shows the print head (wire dot type print head) 7 and the platen 8.
It is a drive shaft for moving parallel to the main body case 5, and is rotatably supported by the main body case 5. On the outer periphery of the shaft 6, helical cam grooves 6A and 6B that are inclined in opposite directions are formed in a continuous loop shape. Further, a drive gear 9 and a drive pulley 10 are respectively fixed to both ends of the drive shaft 6, and the drive gear 9 meshes with the motor gear 2 via intermediate gears 11A and 11B, which are integrated in size and size. The rotational force of the drive pulley 10 is transmitted to the ribbon feed pulley 13 via the endless belt 12, and further transmitted from the ratchet gear 15 to the ribbon feed gear 16 via a friction transmission mechanism constituted by a spring 14. And the shaft 16A of the ribbon feed gear 16
A ribbon winding shaft 17A in a removable ink ribbon cassette 17 is connected to the ribbon winding shaft 17A.
As the ink ribbon 18 rotates, the ink ribbon 18 is wound into the cassette 17 little by little. Note that when the load on the ratchet gear 15 increases, for example when the ink ribbon 18 is used to the end, a slip occurs in the friction mechanism, and the transmission of rotational force from the ribbon feed pulley 13 to the ratchet gear 15 is interrupted. Ru. Also, when manually rotating the protruding end of the ribbon winding shaft 17A to eliminate slack in the ink ribbon 18,
The ratchet gear 15 idles relative to the ribbon feed pulley 13.

The print head 7 is attached to a carrier 19, and a cam roller (not shown) that fits into the cam groove 6A or 6B of the drive shaft 6 is rotatably attached to the carrier 19. Further, the carrier 19 is guided by two round rod-shaped guide bodies 20 and 21 arranged parallel to the platen 8, so that it can move parallel to the platen 8. Therefore, when the drive shaft 6 is driven by the motor 1 and rotates in a certain direction, the cam rollers roll within the cam grooves 6A and 6B, and the carrier 19 is thereby moved to the platen 8.
It moves back and forth in a straight line parallel to the object.

The printing head 7 includes a plurality of dot wires,
The coil of each plunger is connected to a control circuit (not shown) via a flat cable 22. The flat cable 22 is fixed to the carrier 19 and a suitable fixing part (for example, the main body case) by a pair of fixing devices 23, 23, respectively, and the movement of the carrier 19 is not hindered between the two fixing devices 23, 23. I've loosened it up enough. As shown in FIG. 2, each fixture 23 is made of synthetic resin or the like so as to hold the flat cable 22 in a state folded at an almost right angle in one plane, and is attached to the through hole 23A. It is attached to a fixed part of the carrier 19 or the main body case 5 by inserting a screw. At this time, rotation about the mounting screw can be prevented by fitting the protrusion 23B provided on the mounting surface into the recess provided in the fixed portion. Note that the shape of the space within the fixture 23 is, of course, matched to the shape of the corner of the folded flat cable 22, so that the flat cable 22 does not move unduly within the fixture 23. Furthermore, the fixture 23
One end 23C of the cable 2 is expanded into a lattice shape.
2, the cable 22 can be gently bent between the two fixing devices 23, 23.

Among the guide bodies 20 and 21, one guide body 20 has both ends directly fixed to the main body case 5, while the other guide body 21 has a pair of movable supports 24 bent into a substantially U-shape. , 25 and support shaft 2
It is attached to the main body case 5 via 6. That is, a support shaft 26 is fixed to the main body case 5 in parallel to the platen 8, and both movable supports 24 and 25 have one end of each side facing upward, and the support shaft 26 at the lower end of both sides. is inserted through the main body case 5, and is rotatable with respect to the main body case 5. Each movable support 24, 25 has an outer side piece longer than an inner side piece, and both supports 24, 25
The outer side pieces support both ends of the other guide body 21. Also, both supports 24, 2
The outer side pieces of 5 also support both ends of the pinch roller shaft 27. Note that a pinch roller 28 is rotatably mounted on the pinch roller shaft 27.
This pinch roller 28 is connected to both movable supports 24 and 25.
As the platen 8 rotates, it comes into contact with and separates from a paper feed roller 29 arranged parallel to the lower part of the platen 8. Note that this paper feed roller 29 is provided with a pair of left and right small diameter portions 29A, 29A, and a roller gear 29B is fixed to one end of the roller 29. Further, as shown in FIG. 3, an engagement pin 30 is provided on the inner side piece of one movable support 24 so as to protrude toward the other movable support 25. An engagement hole 31 into which the engagement pin 30 is inserted is bored in the side piece. Therefore, both movable supports 24 and 25 are made to be able to rotate independently of each other with respect to the support shaft 26, but the engagement pin 3
0 and the engagement hole 31, the range in which they can be rotated independently is limited to a small range, and beyond this range, both supports 24 and 25 begin to rotate integrally. Furthermore, each of the movable supports 24 and 25 has contact parts 32 and 33 that protrude below the paper feed roller 29 from the tip of the inner side piece, and is hooked between the outer side piece and the main body case 5. The passed spring members (tension springs) 34, 34 always bias the pinch roller 28 in the direction of making it circumferentially contact the paper feed roller 29. Thus, the gap between the platen 8 and the print head 7 (indicated by G in FIG. 4) is maintained constant.

As shown in FIG. 4, the carrier 19 is configured to sandwich one guide body 20 from above and below at its rear end, so that the carrier 19 is moved in the direction toward and away from the platen 8 by this guide body 20. shall not be restricted. Therefore both movable supports 24,2
When the other guide body 21 is displaced with the rotation of the printer 5, the carrier 19 is displaced together with the other guide body 21, and the print head 7 is brought into contact with and away from the platen 8. A protrusion 19A is provided at the rear end of the carrier 19, and this protrusion 19A abuts one of the guide bodies 20 to prevent the print head 7 from coming into contact with the platen 8.

In the figure, reference numeral 35 denotes a transmission lever whose one end is pivotally connected to the main body case 5 via a shaft 36, and has two arms extending from the center of rotation, and one arm has a long hole. 37 to insert an engaging pin 38 protruding from one movable support 24, and the other arm is connected to a plunger 41 via a connecting pin 39 and a connecting rod 40. This plunger 4
1 is driven forward and backward by a driving means 42, and when the plunger 41 is pulled in the direction of the arrow in FIG.
34 and is held at the stop position shown in FIG. 5 (a position where the print head 7 on the carrier 19 is separated from the platen 8).

The driving means 42 has both movable supports 24 and 25.
Both movable supports 24, 25 are attached to the spring members 34, 34, which elastically hold the printing operation position shown in FIG. It consists of a permanent magnet (not shown) that holds the motor in a stopped position, and a coil (not shown) that selectively generates a magnetic field of positive or reverse polarity in this permanent magnet. The magnetic force of the permanent magnet is strengthened or the same magnetic force is eliminated. A micro switch 43 is arranged near the connecting pin 39, and when the plunger 42 is pulled in the direction of the arrow in FIG.
Then turn on this switch 43,
The position of the movable supports 24, 25, ie, the position of the print head 7, is displayed by suitable means responsive to the switch 43.

Below between the paper feed roller 29 and the pinch roller 28, a paper stopper 44 having a paper receiving groove 44A on the upper surface side is arranged parallel to the platen 8 and the paper feed roller 29. Paper sensors 45, 45 are attached to the left and right ends of the paper receiving groove 44A, respectively.
Standard size paper 46A, such as a slip, inserted into the paper receiving groove 44A between the pinch roller 28 and the
is detected by both the sensors 45, 45. Further, a paper guide 47 is connected to the rear side edge of the paper receiving groove 44A. The paper guide 47 extends below the paper feed roller 29 with an appropriate gap between the paper guide 47 and the paper feed roller 29, and moves the rolled long paper 46B such as journal receipts to a position behind the paper feed roller 29. This acts to guide the roller 29 forward along the outer periphery of the roller 29 from below. As shown in FIG. 6, the paper guide 47 has a side wall 47A at one end that regulates the paper width.
However, at the other end of the upper surface, a locally lowered relief portion 47B is provided, and the tip of the paper width adjuster 47C is located in the relief portion 47B. The paper width adjuster 47C is attached to the main body case 5 as shown in FIG.
By adjusting the position according to the width dimension of the long paper 46B to be used, it works in cooperation with the side wall 47A to prevent the paper 46B from shifting in the width direction. do. In this case, as shown in FIG. 7, the tip of the paper width adjuster 47C has entered the relief part 47B, so the side edge of the paper 46B is between the adjuster 47C and the paper guide 4.
7 and does not protrude to the outside, and it is possible to reliably prevent the paper 46B from shifting in the paper width direction.

Further, a guide plate 48 made of a leaf spring is fixed to the rear inner surface of the paper receiving groove 44A. This guide plate 48 has its base end (lower end) connected to the paper stopper 44.
It has a pair of left and right presser parts 48A, 48A at the tip (upper end), and these presser parts 48A, 4
8A is positioned within each small diameter portion 29A, 29A of the paper feed roller 29 as shown in FIGS. It is made such that it does not protrude outward beyond a plane A that is in common contact with the outer circumferential surface of. Then, the long paper 46B that has passed between the paper feed roller 29 and the paper guide 47 rises along one surface of the guide plate 48 and is guided between the paper feed roller 29 and the pinch roller 28. 1
As shown in FIG. 0, it comes into close contact with the outer periphery of the paper feed roller 29. Further, the standard size paper 46A inserted downward through the space between the paper feed roller 29 and the pinch roller 28 is guided by the other surface of the guide plate 48 and comes into contact with the bottom surface of the paper receiving groove 44A, and when printing starts. positioning is now possible.

The roller gear 29B fixed to one end of the paper feed roller 29 meshes with a clutch gear 50A of a spring clutch 50 via an intermediate gear 49, and the clutch shaft 50B meshes with the drive gear 9 via intermediate gears 51 and 52. A matching operating gear 50C is fixed. Therefore, the clutch shaft 50B is rotationally driven by the drive gear 9.
is always held in a disconnected state by the clutch lever 53, and the rotation of the clutch shaft 50B is not transmitted to the paper feed roller 29. However, when the electromagnet 54 is energized and the clutch lever 53 is rotated, the clutch 50 is connected, and the rotation of the clutch shaft 50B is transmitted to the paper feed roller 29 via the clutch 50.

A shaft 55 is located below the paper feed roller 29.
is arranged parallel to the axis of the roller 29, and this axis 5
A pair of paper pressing members (only one is shown) 56 as shown in FIGS. 3, 11, and 12 are rotatably attached to the 5. A tension spring 57 is stretched between one end of each paper presser member 56 and the engagement pin 30 of the movable support 24.
is constantly biased in the direction of pressing the paper presser 56A provided at the other end against the paper feed roller 29 as shown in FIG. When in the position (position where the pinch roller 28 is brought into circumferential contact with the paper feed roller 29), the contact portions 32, 33 of each movable support 24, 25
One end of each of the paper press members 56, 56 is pressed, and the paper press parts 56A, 56A are separated from the paper feed roller 29.

In the printing apparatus described above, when the printer is stopped, the plunger 41 is attracted and held by the permanent magnet of the driving means 42, and the movable supports 24 and 25 are held at the stop positions shown in FIGS. 5 and 11. In this state, print head 7 and pinch roller 28 are spaced apart from platen 8 and paper feed roller 29, respectively, so that sheets 46A and 46B can be easily inserted. That is, the long paper 46B is held by the paper feed roller 2 with the paper pressing member 56 being separated from the paper feed roller 29 against the spring 57.
9 and the paper guide 47, it is guided upward by one surface of the guide plate 48 and comes to be located between the paper feed roller 29 and the pinch roller 28. Then, when the paper presser member 56 is released, the long paper 46B is moved between the paper presser member 56 and the paper feed roller 2.
9, so there will be no misalignment. Next, when the standard size paper 46A is inserted between the paper feed roller 29 and the pinch roller 28 from between the platen 8 and the print head 7, the paper 46A is guided downward by the other surface of the guide plate 48. , comes into contact with the bottom surface of the paper receiving groove 44A of the paper stopper 44 and is held at the printing start position.

Therefore, when a current is passed for a short time in the direction of generating a magnetic field of opposite polarity to that of the permanent magnet in the coil of the driving means 42, the attraction force of the permanent magnet to the plunger 41 disappears, and the movable supports 24 and 25 are moved to the spring member 34. , 34 to the printing operation position shown in FIGS. 4 and 12 to bring the pinch roller 28 into circumferential contact with the paper feed roller 29.
is held close to the platen 8. At this time, the gap between the print head 7 and the platen 8 increases by the thickness of the paper 46A, 46B, so the print gap G between the print head 7 and the paper surface on the platen 8 is always kept constant. be done. Therefore, in this state, the motor 1 drives the drive shaft 6.
By rotating the carrier 19 and moving the carrier 19 parallel to the platen 8, the printing head 7 can be driven to perform predetermined printing on the sheets 46A and 46B.

In this way, one line of printing is done while the carrier 19 moves forward, but when the electromagnet 54 is energized and the spring clutch 50 is connected during the backward movement of the carrier 19, the rotation of the drive shaft 6 is controlled by the paper feed roller. As the paper feed roller 29 rotates, both sheets 46A and 46B are fed upward together by the cooperation of this roller 29 and the pinch roller 28, so that the carrier 19 moves forward again. If necessary, the next line can be printed.

When printing of a predetermined number of lines is completed and the printing operation is stopped, a current flowing in the direction of generating a magnetic field of the same polarity as that of the permanent magnet is passed through the coil of the driving means 42 for a short period of time to increase the attraction force of the permanent magnet. is strengthened and the plunger 41 is drawn in the direction of the arrow in FIG. 1, thereby rotating the movable supports 24, 25 to the stop positions shown in FIGS. 5 and 11. In addition,
The plunger 41 continues to be attracted and held by the permanent magnet even if the current to the coil is cut off. In this state, the standard size paper 46A can be taken out, and by further rotating the paper pressing member 56 against the spring 57, the long paper 46B can also be taken out.

As explained above, according to the present invention, since the print head and the pinch roller are separated from the platen and the paper feed roller by a large distance, it is possible to more easily insert the standard length paper between the print head and the platen. Since the paper pressing member moves into and out of contact with the lower outer periphery of the paper feed roller in conjunction with the movement of the pinch roller toward and away from the paper feed roller, it is possible to prevent the long paper from shifting when inserting the fixed length paper. In addition, by supporting the pinch roller and guide body with a movable support, the printing gap between the print head and the paper surface on the platen can be kept constant at all times, so that long paper and standard paper can be Good overlapping printing is possible.

[Brief explanation of the drawing]

The drawings all show an embodiment of the present invention; FIG. 1 is an exploded perspective view, FIG. 2 is a perspective view showing a fixture, FIG. 3 is a partial perspective view, and FIGS. FIG. 6 is a partial side view, FIG. 6 is a partial perspective view, FIG. 7 is a cross-sectional view of FIG. 6, FIG. 8 is a partial plan view, and FIG.
The drawings are a cross-sectional view taken from FIG. 8, FIG. 10 is a plan view showing the same part as FIG. 8, and FIGS. 11 and 12 are partial side views. 7...Print head, 8...Platen, 28...
Pinch roller, 29... Paper feed roller, 56...
Paper pressing member, 57... tension spring.

Claims (1)

[Claims] 1 a platen, a guide body provided parallel to the platen, a carrier supported movably in the axial direction by the guide body, a printing head provided on the carrier facing the platen, and a print head provided on the carrier facing the platen; a paper feed roller provided at the bottom of the paper feed roller, a pinch roller provided so as to be able to approach and separate from the paper feed roller, and a pinch roller that supports the pinch roller and the guide body and moves towards and from the platen and the paper feed roller. a movable support member rotatably provided in a direction, a means for rotating the movable support member to separate the print head and the pinch roller from the platen and the paper feed roller, respectively; a paper guide provided along the printer to guide the long paper from the rear side to the front of the platen; and a paper stopper provided integrally with the front end of the paper guide to support the fixed-length paper inserted from between the print head and the platen. and a paper pressing member that moves toward and away from the lower outer periphery of the paper feed roller in conjunction with the movement of the pinch roller toward and away from the paper feed roller.