JPH0256222B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a platen device of an automatic form insertion device used, for example, in an inkjet printer.

[Technical background of the invention and its problems]

Conventionally, printers have been widely equipped with a function of printing not only on continuous forms but also on single forms, and are equipped with so-called auto-inserters. However, conventional auto inserters employ a method of inserting the form from the front side of the platen, feeding it back to a predetermined position, and feeding out the form in the normal direction while printing again. This method has the advantage that if the form has already been printed in a specified manner and the operator wants to print more on it, the operator can insert it in the same way as printing, but it has the following disadvantages: have

First, a reversing mechanism is required for feedback after inserting the form, and setting of the printing position for reversing becomes unstable. Furthermore, since the form insertion position is at the front, it becomes difficult to see the print. moreover,
It is difficult to associate the continuous paper tractor with the form guide, and there are also operational problems. For this reason, the structure becomes complicated and reliability is lacking.

There is also a method of inserting the form from behind the platen as in a typewriter, but there is no inserter that is completely automatic in terms of setting the printing position, automatic ejection, etc.

[Object of the Invention] It is an object of the present invention to provide an automatic form insertion device that allows accurate printing positioning and easy automatic ejection using a unidirectional rotation mechanism when a form is inserted from the rear of the platen.

[Summary of the invention]

In the present invention, two grooves are formed along the longitudinal direction of a cylindrical platen, and one groove is provided with a clamp bar assembly for clamping the form, and the other groove is provided with a clamp bar assembly for releasing the clamped form. A release bar is provided, a detection disk is provided at one end of the platen, and a home position sensor assembly and a release position sensor assembly are provided for setting a home position and a release position according to the position of the detection disk. , a solenoid is provided that drives the clamp bar assembly or release bar based on signals from the home position sensor assembly and the release position sensor assembly, and detects the presence or absence of a form by facing the platen at the home position. The present invention is characterized in that a clamp sensor assembly is provided.

[Embodiments of the invention]

(Overall structure) The printing paper insertion/ejection mechanism can be roughly divided into the first
In the figure, it consists of a main body part 1, a tractor part 2, and a printing device part 3.

(Description of the main body) First, in FIG. 2, the chassis assembly 1
4 has a left frame assembly 10 and a right frame assembly 23, one on the left and one on the right, and a fan assembly 28 for ventilation etc. is attached to the front right side of the chassis assembly 14. On the right frame assembly 23 side, there are a stepping motor assembly 26 for driving this device, gears 227 and 125 for transmitting the power, and a back tension arm assembly 24 for applying tension to the paper during continuous paper. . On the left frame assembly 10 side, there are a home position sensor assembly 7 for determining the home position and release position of the platen assembly 17, a release position sensor assembly 8, and a clamp sensor assembly 29 for determining the clamp position of the form paper. Detection disc 4 used for the above sensor assemblies 7 and 8, change lever assembly 30 and mode changeover switch 31 for switching modes between continuous paper and ledger paper, paper clamp for ledger paper.・Link mechanism 32 that conveys the operation when releasing
There are two solenoids: a, 32b, and a solenoid 16 and a solenoid 211 for providing movement thereof. Furthermore, left frame assembly 10
and the right frame assembly 23, there is a platen assembly 17 that clamps and releases the paper and serves as a paper running guide in the case of form paper, and also serves as a paper running guide in the case of continuous paper, and a paper running guide. Next platen assembly 17
The paper guide 113 and the paper guide 216 located before and after the back tension assembly 20 that applies tension to the paper in the case of continuous paper, and the platen assembly 17 that performs this function when clamping and releasing the paper in the case of form paper. clamp lever assemblies 33a, 33b and release lever assemblies 19a, 19b, separator assembly 9 as a guide for reliably taking out the paper released from platen assembly 17 at the release position, and platen assembly in the case of continuous paper. The guide stop assembly 1 separates the tip of the paper guide 216 at the front of the paper guide 17 from the platen surface, but limits the amount of separation.
5, the left frame assembly 10, and the rear of the right frame assembly 23 for driving this device.
It consists of a PC board assembly 22. A paper end detection switch assembly 12 is attached to the left end of the guide plate 21 to which the PC board assembly 22 is attached to detect the presence or absence of continuous use. Note that 5 is a tension lever.

(Description of Tractor Section) First, in FIG.
There is one tractor frame assembly 235, and on the side of the tractor frame assembly 235 there is a gear 336 coupled to the tractor shaft 248 for transmitting the movement of the stepping motor 26 and driving a tractor used for discharging continuous paper. There is a gear 437. Tractor frame assembly 134 and tractor frame assembly 23
5, there are a left tractor assembly 38 and a right tractor assembly 39 each equipped with a form paper insertion/ejection mechanism and a continuous paper ejection mechanism.
A roller 40 and a guide plate 41 are located on the rear side of the tractor frame assembly 134 and the tractor frame assembly 235 and are attached to the tractor shafts 1 and 47 to serve as guides when inserting continuous paper, and the platen assembly 17 is used when inserting form paper.
For continuous use, the pinch roller 44 is connected to the platen assembly 17.
A left pinch roller assembly 42 and a right pinch roller assembly 43, which have a built-in mechanism that allows the paper to escape from the paper, out of the way of the paper travel path, and move left and right together with the left tractor assembly 42 and the right tractor assembly 43, and a tractor frame. A home guide 45 is located at the rear upper side of the assembly 134 and the tractor frame assembly 235 and serves as a guide when discharging continuous paper, and a home guide 45 is located between the left tractor assembly 38 and the right tractor assembly 39 when discharging form paper and serves as a guide for discharging continuous paper. It consists of a paper support 46 that serves as a guide. In addition, 49 is the tractor shaft 3, 50 and 51 are the lift shaft assembly 1,
It is 2. Furthermore, 52 and 53 are tractor cases 1 and 2.

Although the tractor cases 1, 252, 53 are made of an insulating material, the tractor frames 34, 35 made of iron plates or the like have insulating bushes 45A.
A home guide 45 made of wire is attached to this insulating bushing 45A. Therefore, even if static electricity is generated when this continuous paper is passed through, the potential will not reach the main body 1.
Prevent electrical troubles from occurring.

(Structure of Tractor Section 2) The case of form paper will be explained with reference to FIGS. 4 and 5. Send the form to the computer 1, 262a, 62b
Insert from the rear side of the platen 91 using as a guide.

The printed paper is pressed against the surface of the platen 91 by the pinch rollers 44 incorporated in the left pinch roller assembly 42 and the right pinch roller assembly 43 with the pinch roller shaft 55 interposed by the pinch roller spring 71. Frequency feed is carried out between the two. The paper released from the platen 91 is pushed up as the platen 91 rotates using the separator 90, the rice ball-shaped portion 42c of the left pinch roller assembly 42, and the right pinch roller assembly 43 as guides, and is pushed up as the platen 91 rotates.
a, 63b toward the opening. As the platen 91 further rotates, the leading edge of the paper passes inside the front guides 1, 263a, 63b and is pushed out along the lids of the tractors 1, 265a, 65b.

In addition, in the case of a sheet with a large width such as B4, the center of the sheet tends to fall toward the tractor shaft 349, easily causing a jam, so a paper support 46 is provided to prevent this. Furthermore, when the trailing edge of the printed paper leaves the pinch roller 44 and the platen 91 and the platen 91 rotates, the trailing edge of the paper may slide down toward the head 92 through the upper side of the pinch roller 44. In order to prevent this, a receiving part 42a is provided on the arm part of the left pinch roller assembly 42 and the right pinch roller assembly 43. In addition, the front guides 1, 263a, and 63b are arranged such that the leading edge of the printed paper is located at the print head 92.
It also serves to prevent you from falling to the side.

Next, the case of continuous paper insertion will be explained with reference to FIG. The roller 40 and the guide plate 41 are used as insertion guides to pass the paper under the platen 91, and the sprocket holes of the continuous paper are hooked to the claws of the tractors 1, 265a, and 65b, and the paper is discharged to the top of the platen 91, and the home guide 45 is guided. This guides the paper to the rear side of the platen 91. In this case, in order to prevent the pinch roller 44 used for free-extraction feeding of the form paper from interfering with the running of the continuous paper, the platen 9 is
It is necessary to release it from the surface of 1. To do this, turn the change lever 93 attached to the main body 1 in the direction of the arrow. Then, the studs at the ends of the roller up arms 1, 280a, 80b are rotated by the change arms 1, 218a, 18b in the direction of the arrow in the figure, and the roller up arms 1, 2
A left pinch roller assembly 42 and a right pinch roller assembly 43 are attached to the same shaft as 80a and 80b, that is, the pinch roller shaft 55.
rotates in the direction of the arrow in the figure, and the pinch roller 44
is separated from the surface of the platen 91. Further, as the change lever 93 rotates, the paper guide 216 attached to the main body 1 is moved to the platen 91 by the same shaft as the change lever 93, that is, the wire 96 attached to the SP bracket plate 102 attached to the change shaft 101. It is separated from the surface of the continuous paper 100 and does not interfere with the running of the continuous paper 100.

Next, when the size of the paper changes, the distance between the tractors 1, 265a, and 65b must be changed depending on the size of the paper, and the mechanism will be explained below with reference to FIGS. 7 and 8. For example, when moving the right tractor 265b to change the spacing, turn the tractor stop 264b in the direction of the arrow in FIG. do. At this time, the amount of rotation of the tractor stop 264b is regulated by the bracket 95. lift lever 270b
The lift arm 272b, which is fixed to the end of the lift shaft 103 that supports the lift shaft 103 and is also used for left and right slides, similarly rotates counterclockwise as the lift shaft 103 rotates, and the stud causes the roller up arm 280b to rotate clockwise. do. The roller up arm 280b is fixed to the end of the pinch roller shaft 55, and the roller up arm 280b
The pinch roller shaft 55 rotates as the right pinch roller assembly 43 rotates, and also serves as a guide when the right pinch roller assembly 43 slides. Along with this rotation, the pinch roller assembly 43 rotates clockwise, and as a result, the pinch roller 44 rises from the surface of the platen 91, allowing it to slide left and right.
At this time, the right pinch roller assembly 43 is pinching one end of the shutter bracket 261b on the back side of the rice ball shape (see Figure 4), and the lift lever 270b is similarly pinched by the shutter bracket 261b (especially as shown in Figure 4). (not shown), the right tractor assembly 39 and the right pinch roller assembly 4
3 is tractor shaft 248 tractor shaft 3
49, the lift shaft 103 and the pinch roller shaft 55 are used as guides to slide left and right.

Further, the shooter brackets 1, 261a, 61b of the tractors 1, 265a, 65b are each provided with a wing 60 that projects rearward and guides the paper. This effectively prevents the paper from meandering.

(Structure of Switching Device A) First, the case of the form paper mode will be explained based on FIG. 9. What is shown in FIG. 9 is a state in which a form sheet is inserted, and the platen 91 is in the home position. That is, clamp arm 1, 2115
Clamp bar assembly 130 by a, 115b
has protruded from the surface of the platen 91 and is waiting for paper to be inserted. Furthermore, the mode changeover switch 31 is set to the form mode by the change lever 93, the pinch roller 44 is in contact with the surface of the platen 91, and the paper guide 216 is in a state where the form is free-fed. It's helping Shyonfeed.

Next, the case of continuous paper mode is shown in Figure 9 and 1.
This will be explained based on Figure 0. When the change lever 93 is rotated in the direction of the arrow in the figure, that is, in the counterclockwise direction, it is separated from the mode changeover switch 31 and the mode is changed to the continuous paper insertion mode. Further, since the change lever 93 rotates about the change shaft 101, the link 1111 fixed to the change lever 93 is pushed downward. Therefore, the stud 1112 in the left frame assembly 10
The link 2113 rotates counterclockwise with the center of rotation acting on the link 3114, and the solenoid 16
The spindle is pushed in. At this time, the change lever 93 is attached to the left frame assembly 10 so that the stud 2119 erected thereon can rotate by a specified amount.
The mode is switched to the continuous paper insertion mode by the spring 1110 using the half-moon-shaped hole provided in the guide as a guide, and does not automatically return to the original state, that is, the form paper insertion mode. There is. Also, clamp arm 1, 2115
a and 115b are still being pulled counterclockwise by the spring 3123, and the solenoid 16 is no longer working.
Even if the clamp arms 1, 2115a, and 115b work to clamp the paper, the clamp arm 1 is attached to the link 3114 as shown in FIG.
115a cannot be stopped. Furthermore, the clamp arm 1115a and the clamp arm 2115
b are fixed to both ends of the clamp shaft 116. Further, the paper guide 216 is attached to the SP bracket plate 102 fixed to the chain shaft 101.
The clamp shaft 116 is rotated counterclockwise by the wire 96 hung on the clamp shaft 116 as the center of rotation until it hits the guide stop shaft 117, so that its tip comes away from the surface of the platen 91 and does not interfere with the running of the continuous paper. It disappears.

Further, the change arms 18a and 18b fixed to the change shaft 101 are connected to the change lever 9.
3 rotates counterclockwise, and its tip pushes the stud 4121 of the roller up arm 1, 280a, 80b downward. The left pinch roller assembly 42 and the right pinch roller assembly 43, which are attached to the same shaft as the roller up arms 1, 280a, and 80b, that is, the pinch roller shaft 55, are rotated clockwise to remove the pinch roller 44 from the surface of the platen 91. Leave. In this manner, the mode can be changed from the form paper mode to the continuous paper mode using a single change lever 93.

Furthermore, when the mode is switched from the continuous paper mode to the form paper mode, the change shaft 101 rotates clockwise, and as a result, the link 1111 is pulled up, and the link 2113 is moved from the stud 1112.
Rotate clockwise around the center. Therefore, the link 2113 separates from the link 3114, and since the link 3114 is pulled by the spring 2118, the fixation of the spindle of the solenoid 16 is released, and the solenoid 16 becomes operative. In addition, roller up arms 1, 280a, 8
Since 0b is pulled counterclockwise by the pinch roller spring 71, the change arm 1,
When the tips of the roller up arms 1, 280a, 80b are removed from the studs 4121, the pinch roller shaft 55 rotates counterclockwise, and the pinch roller 44 is pressed against the surface of the platen 91. Further, as the chain shaft 101 rotates clockwise, the tension of the wire 96 is loosened and the paper guide 216 is pulled downward by the spring 4122, so that its tip is pressed against the surface of the platen 91. In this way, the mode can be switched from the continuous paper mode to the form paper mode using a single change lever 93.

(Structure of platen device B) Regarding the platen structure, Figures 11 to 14
As shown in the figure. First, the clamp bar assembly 130 is inserted from the outside of the platen 91, and one end of the clamp spring 134 is applied to both sides, and the other end is applied to the platen stud 138 fixed to the platen guide 137, and is pulled. Further, the release bar 131 is inserted from the inside of the platen 91 so as to fit into the groove, and the release springs 135 are hung between the ends of the release bar 131 and the platen stud 138 in the same way as the clamp bar assembly 130 and tensioned.
Further, the clamp bar assembly 130 and the release bar 131 are positioned in the radial direction by a clamp bar guide 132 fixed to a platen guide 137. The clamp bar assembly 130 has the function of clamping the inserted form paper between the platen 91 and the platen 91 at the home position of the platen 91 and transporting the paper to the print head 92 side as the platen 91 rotates. Make sure that the platen 91 does not jam as it leaves the clamp bar assembly 130 in the release position.
It has a function to separate it from the

Moreover, what is shown in FIG. 14 is a plan view of the platen 91, and at the end of the platen 91, which is made by wrapping rubber around a hollow cylindrical pipe and polishing the surface, there is a band-shaped belt having a diameter x smaller than the diameter of the platen. A groove is provided. This band-shaped groove surface is made rougher than the surface of the platen. This groove is also perpendicular to the clamp sensor assembly 29. When paper is wrapped around a normally used rubber platen with a polished surface and fed, and the surface of the platen is slightly smooth, the reflectance of the surface is approximately 90% that of white paper, according to experiments. It will be about the same level. In this state, a reflective sensor cannot be used to detect the presence or absence of form paper, and a complicated mechanism (for example, a mechanical structure) is required. Therefore, a part of the platen is made concave in a band shape to prevent the influence of wear caused by the paper and to make the surface rough, thereby increasing the S/N ratio of the clamp sensor assembly 29.

(Structure of Form Clamp/Release Device C) The structure of this mechanism will be explained based on FIGS. 15 to 20. First, at the home position of the platen 91, the clamp bar assembly 130 is in a state protruding from the platen 91, and in this state, the form paper 147 is inserted using the shooters 1, 262a, and 62b as guides. Shooter 1, 262a,
Form paper 147 inserted using 62b as a guide
The paper falls along the paper guide 113 and is stopped by the clamp 144 on the clamp bar assembly 130. In addition, since the center of the clamp sensor 143 is attached above the abdomen of the clamp 144, it has a function of checking the presence or absence of the form paper 147 in the form paper mode, and this clamp sensor 143 detects whether the form paper 147 is present. Once this is confirmed, the solenoid 16 is activated and the link 3114 is pulled and rotated counterclockwise about the stud 5145 attached to the left frame assembly 10. Since the clamp arm 1115a is tensioned by the spring 3123 between it and the stud 5145,
When the link 3114 rotates counterclockwise, the distal end of the link 3114 and the clamp arm 1115a disengage, and as a result, the clamp arms 1, 2115a, and 115b rotate counterclockwise about the clamp shaft 116. Since the clamp bar assembly 130 is pulled toward the inside of the platen 91 by the clamp spring 134, the clamp arm 1, 2115a, 115
b rotates counterclockwise, the clamp bar assembly 130 also retracts into the platen 91 and the clamp 1
The leading edge of the form sheet 147 is sandwiched between the sheet 44 and the platen 91. The state is shown in FIG.

Next, when the platen 91 rotates, the form paper 147 also moves toward the printing unit side, and printing starts on the form paper 147, and then the platen 91
1 rotates and reaches the release position, the solenoid 211 is activated and the leading edge of the form 147 is released from the platen 91. When the solenoid 211 operates, the release levers 1, 2140a, 140b rotate clockwise around the release shaft 146, and the release lever tip 141 attached to the tip lifts the clamp bar assembly 130 and the release bar 131 and releases the form 147.
away from the platen 91. In order to prevent the form paper 147 from being pulled by the release bar 131 when releasing the form paper 147 from the platen 91,
The structure is such that the clamp bar assembly 130 is first lifted, and then the release bar 131 is lifted.

When the release levers 1, 2140a, 140b rotate clockwise around the release shaft 146, the link 414 attached to the tip thereof
2 is lifted upward, and as a result, the clamp arms 1, 2115a, 115b rotate clockwise about the clamp shaft 116. When the clamp arms 1, 2115a, 115b rotate clockwise around the clamp shaft 116, their tips engage with the link 3114, and the clamp bar assembly 130 and release bar 131 are maintained in a protruding state from the platen 91. When the platen 91 further rotates, the clamp bar assembly 130 is disengaged from the release lever tip 141 and the clamp spring 134 is released as shown in FIG.
into the platen 91. In this state, the release bar 131 is still on the release lever tip 141, and the form 147 is still on the platen 9.
1, the leading edge of the form sheet 147 is discharged upward as the platen 91 rotates using the separator 90 as a guide. When the platen 91 rotates a little further, the clamp bar assembly 130
Similarly, the release bar 131 is also detached from the release lever tip 141 and pulled into the platen 91.
The clamp bar assembly 130 and release bar 131 that have been retracted into the platen 91 are supported by a clamp bar guide 132. Further, when the platen 91 is further rotated by the detection disk 4 and the release position sensor assembly 8, the solenoid 16 is activated and the clamp arm 1115a and the link 3114 are disengaged, and the clamp arm 1, 211
5a, 115b and release lever 1, 2140
Even if the tips of a and 140b escape toward the center of the platen 91 and the platen 91 continues to rotate, the clamp bar assembly 130 and release bar 1
31 and clamp arm 1, 2115a, 115b
It is designed so that it does not lock.

When all printing is completed and the platen 91 reaches the home position, the detection disc 4 and the home position sensor assembly 7 activate the solenoid 211.
is activated, and the machine enters a waiting state for the insertion of form paper.

Next, in FIG. 20, the state immediately after the form sheet 147 is fed out after printing is completed is shown by dotted lines. That is, as the platen 91 rotates, the form sheet 147 pinched by the pinch roller 44 is guided by the rice ball-shaped portions 42c of the pinch roller assemblies 42 and 43, and is moved between the front guides 1, 263a, 63b and the tractors 1, 265.
The paper is ejected through the gap between the upper surface of the lid 65a and the upper surface of the lid 65b. When the rear end is separated from the pinch roller 44 and becomes free, it rises slightly due to the inertia of the form 147 and then falls due to its own weight. During this descent, the form sheet 147 is aligned with the inclination of the front guides 1, 263a, 63b as shown by the dotted lines, so that it is received by the receiving portions 42d of the pinch roller assemblies 42, 43. Therefore, the rear end of the form sheet 147 will not fall toward the pinch roller 44 side.

Next, FIG. 21 is a timing chart showing an operating state at L level. The part that was not mentioned in the above explanation is that there is a form/continuous paper switching switch and the selection is made before the start. Other operations are as described above.

〔Effect of the invention〕

The present invention can detect the position of the platen in the rotational direction by providing a home position sensor assembly and a lease position sensor assembly for the detection disk provided integrally with the platen as described above, The clamp bar assembly and release bar provided on the platen are made to operate in correspondence with this position, so the form can be clamped and positioned at the home position, the necessary printing performed, and then moved to the release position. This makes it possible to insert a form from the rear of the platen and feed the form by rotating it in one direction, ensuring accurate printing positioning and easy automatic ejection. It has the following effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention. Fig. 1 is a perspective view of the tractor section separated from the main body section, Fig. 2 is an exploded perspective view of the main body side, and Fig. 3 is an exploded view of the tractor section. 4 is a front view of the tractor unit, FIG. 5 is a side view of a portion thereof, FIG. 6 is a vertical side view when continuous paper is inserted, and FIG. 7 is a partially enlarged vertical side view. FIG. 8 is a vertical side view of the released state, FIG. 9 is a vertical side view of the home position in the form paper mode, FIG. 10 is a vertical side view of the home position in the continuous paper mode, and FIG. 11 is a vertical side view of the home position in the continuous paper mode.
The figures are an exploded perspective view of the platen, Fig. 12 is a side view thereof, Fig. 13 is a partially cutaway front view, Fig. 14 is a plan view, Fig. 15 is a vertical side view just before clamping the form, and Fig. 15 is a side view of the platen. Figure 16 is a vertical side view in the clamped state, Figure 17 is a vertical side view when the clamp is released and the form is fed out, Figure 18 is a vertical side view when it is ejected, and Figure 19 is a vertical side view when printing or continuously feeding paper. A side view, FIG. 20 is an enlarged longitudinal sectional side view of a portion when a form is ejected, and FIG. 21 is a timing chart. 4...Detection disc, 6...Solenoid, 7...Home position sensor assembly, 8...Release sensor assembly, 11...Solenoid, 29
... Clamp sensor assembly, 91 ... Platen, 130 ... Clamp bar assembly, 131 ...
...Release bar.

Claims (1)

[Claims] 1 Two grooves are formed along the longitudinal direction of the cylindrical platen, one groove is provided with a clamp bar assembly for clamping the form, and the other groove is provided with a release bar for releasing the clamped form. a detection disc is provided at one end of the platen, and a home position sensor assembly and a release position sensor assembly are provided for setting a home position and a release position according to the position of the detection disc, A clamp sensor includes a solenoid that drives the clamp bar assembly or release bar based on signals from a home position sensor assembly and a release position sensor assembly, and detects the presence or absence of a form by facing the platen at the home position. A platen device for an automatic form insertion device, characterized in that it is provided with an assembly.