JPH0721332Y2 - Printer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a printing device.

In this type of printing apparatus, the print-receiving member is entirely conveyed forward line by line at a right angle to the line direction printed by the conveying means and is printed line by line. Printheads in modern printing devices, such as needle print heads or ink pattern print heads that are movable in the row direction or heated print edge members that are not movable in the row direction, are very accurate with respect to the printed material during the printing process. It must be kept at a very small interval and a constant pressure should be kept against the printing target member.
It is known to measure the thickness of the print target member with the sensor equipment and control the distance between the print head and the print facing member with the sensor equipment in order to ensure the accurate spacing or the crimping force even with the print carriers of different thicknesses. is there. A typical use example of this type of printing device is a printing device for printing receipts in a register for printing receipts in a register or for printing a bankbook. In this case, the print facing member has any suitable and suitable shape, for example as a cross beam with a flat writing plane or as a rotatable print roller.

Prior art and its problems Sensor equipment is formed by a sensor tube or a sensor roller provided on a swing frame, and the sensor tube or the sensor roller is fixed by a spring member in a printer housing to print. A structure capable of being brought into contact with a member to be printed in contact with a beam member is known (DE-OS22482).
62). Sensor edge members extending parallel to the row direction are fixed to the swing arm, and a printhead movable in the direction perpendicular to the writing plane is in spring contact with these sensor edge members via the sensor tube. These facilities are for controlling the distance between the printing head and the printing beam member. They must also be equipped with means for separating the sensor tube and the print head. Regardless of the structure described in DE-PS2248262, it must also have means for transporting the print-receiving material. This means generally comprises a conveying roller coupled to a driving device, a print facing roller, a member for bringing the conveying roller into contact with a member to be printed, and a member for lifting the conveying roller to set the member to be printed,
Have.

The known installation has, in addition to the indispensable transport device having drive means and moving means, a sensor device independent of it,
On the other hand, the sensor device has a series of movably provided structural parts and the actuating members of the sensor device, which makes the structure very expensive. Another disadvantage of the known construction is that the setting transmission from the sensor tube to the print head takes place via a series of bearing positions which are moved when the sensor device is moved towards or away from it, especially with high wear. Is to receive. This wear manifests itself as misalignment of the print heads during use of the printing device, thus necessitating regular post-adjustment or periodic replacement of sensor device components.

OBJECT OF THE INVENTION It is an object of the present invention to provide a printer of this type which has a simple structure, is inexpensive to manufacture, and avoids misalignment of the print head due to bearing wear.

Configuration of the Invention This problem is solved by the features of the invention as claimed in claim 1 of the present invention.

Particularly precisely, the printhead does not move vertically toward or away from the writing plane. For example, in the case of a printhead that is movable in the row direction, the printhead is provided so that it can only be moved in this direction, and this movement can easily be carried out by means of a precise longitudinal guide with strength. It does not require a cross-running facility of known construction, which has problems with accuracy. The control of the distance between the print head and the print facing member or the printing force is performed by moving the print facing member toward the writing plane vertically, and in this case, the movement direction of the print facing member is only one direction. At the same time, the method of moving the printing facing member can be very simple. A transport means and a thickness control mechanism are further provided on the support member that supports the print facing member, so that the transport means, the thickness control mechanism, and the print head relatively approach and pull with respect to the print target member. Only one movement drive means is required to disengage. After bringing the conveying member into contact with the printing target member, when the support is brought closer, the spring transmission member is loaded and controlled by the thickness control mechanism. The exact spacing or printing force between can be obtained.

Further, since the conveying means and the printing facing member are provided on the support, the conveying means also serves as a thickness control mechanism at the same time, while the constitution of the present invention allows, for example, the conveying roller to be accurately aligned with the printing head. The print facing member also operates in the correct position relative to the print head because it cooperates with one (or more) facing rollers and is thus mechanically fixedly coupled on a common support. Since only one roller installation is provided for the transport and thickness inspection of the material to be printed or the receipt, the crimping means is correspondingly simple. On the other hand, when the transport roller and the sensor roller are separate, the crimping equipment must be provided separately, so that only one crimping equipment is required in the present invention.

In this case, according to the invention, it is envisaged that a spring transmission member is provided between the movement drive means for the support and the support member of the transport roller on the support. Therefore, the moving amount of the movement driving means is transmitted to the conveying roller via the spring transmitting member inserted in the middle, and in this case, the pressing force of the conveying roller against the opposing roller or the receipt is performed via the spring member.

In the embodiment according to the present invention, the carrying roller is provided on the carrying roller shaft, and the carrying roller shaft itself is provided on the support so as to be movable in a direction substantially corresponding to the moving direction of the support, and is compressed. It is crimped in the crimping direction by a spring. When the transport roller is further approached beyond the position of contact with the receipt when the support is approached, the compression spring is compressed, thereby forming a crimp. In the simplest case, the movement driving means is provided so as to stop at a predetermined crimping force of the conveying roller and a predetermined crimping force of the compression spring so that a predetermined distance from the print head of the print girder member can be obtained.

However, in a preferred construction of the present invention, the movement drive means of the support is formed as a position adjustment drive means, and a limit switch operated from a movable transport roller shaft is provided on the support, and the limit switch is The position adjusting drive means is controlled so that the movable conveying roller shaft takes a certain set position relative to the support, and the compression spring generates a constant spring force corresponding to a predetermined crimping force at this set position. Have been considered to. When the receipt is set, the movement driving means of the support receives an instruction to move the support closer. The limit switch takes a position corresponding to the approach command of the movement drive means. When the transport roller comes into contact with the receipt, the transport roller is moved in the direction opposite to the approaching direction with respect to the support,
At this time, the compression spring is compressed, and when the conveying roller reaches a predetermined set position relative to the support body, the limit switch is opened, so that the movement drive is stopped. If it deviates from the set value, the movement drive means is controlled in the direction to reset the set value via the limit switch. In order to improve this control method, according to the invention, a movable transport roller shaft drives a conversion lever which is pivotally mounted on a support and which magnifies the transport roller shaft's movement movement, in this case the lever. The drive end of is operated by a limit switch and is loaded with force by a compression spring.

In another embodiment of the invention, the transport rollers are provided at a fixed position on the support, in which case the drive means for moving the support is a straight line having respective switching positions corresponding to the disengaged position and the engaged position. A spring transmission member is formed between the movement driving means and the support, and the spring transmission member allows the movement driving means to overstroke beyond the stroke corresponding to the engaging position.

When the support approaches and the transport roller comes into contact with the receipt and the print beam member reaches its writing position, the movement driving means executes its excessive stroke, and the spring force generated at this time determines the pressure force of the transport roller. .

According to the invention, the support is formed as a frame, which is movably attached to the printer housing via a parallel link mechanism. The transport drive means drivingly connected to the transport roller is provided in the printer housing, in which case the drive connection for performing relative movement between the transport roller and the transport drive means can be formed, for example, by a link joint shaft. is there. In a preferred embodiment of the invention, on the one hand, the transport drive means are provided on a support, in which case the drive connection between the transport rollers and the transport drive means can be rigidly formed.

Other features and advantages of the present invention are described in the utility model registration claims, the drawings, and the description of the drawings.
Embodiments of the present invention will be described in detail below with reference to the drawings.

[Explanation of Examples]

The printer 2 shown schematically in FIG.
It is provided inside. The printing device 2 includes a printing head 6, a printing beam member 8 serving as a printing facing member, and a member to be printed.
It has one or a plurality of parallel carrying rollers 10 for carrying 12 forward in the direction of arrow 14, and a facing roller 16 acting as a facing member of the carrying roller 10. The printing beam member 8 and the conveying roller 10 are provided on one support 18 and the support 18
Is mounted movably in the direction of arrow 20 in the printer housing 4. Means for moving the support 18 in the direction of the arrow 20 will be described in detail later.

As can be seen in FIG. 1, the transport roller shaft 22 is mounted not directly on the support 18 but on the conversion lever 24, which is mounted on one support 18 pivotably about a shaft 26. ing. Thus, the transport roller shaft 22 draws an arc around the shaft 26 and is moved relative to the support 18 in a movement direction 20 which substantially corresponds to the movement of the support 18. Conversion lever 24
The free end of is loaded by a compression spring 28, which exerts a force on this free end in the crimping direction or in the direction of the arrow 30.

A limit switch having three contact pieces 34, 35, 36 is a support.
It is fixedly provided in 18. The intermediate contact piece 35 is moved from the upper switching position shown in FIG. 1 to the lower switching position shown in FIG. 2 via the neutral position by the actuating projection 38 formed on the conversion lever 24. The upper switching position shown in FIG. 1 acts so that the movement drive means for the support 18 actuates the support 18 in the crimping direction 30 and the lower switching position shown in FIG. 2 moves the support 18 in the reverse direction. Act to work. In the intermediate neutral position, the movement drive means does not operate.

The function of the printing device will be described below with reference to FIGS. 1 and 2. In the lowered position of the support 18 shown in FIG. 1, the printing apparatus is in the state of set preparation of the printing target member 12. The member to be printed 12 is inserted between the print head 6 and the print beam member 8 and the print carrier 12 strikes the stopper 40. An appropriate sensor which detects that the member 12 to be printed has been set activates the movement drive means for the support 18. Since the limit switch 32 has the switching position corresponding to the operation of the moving drive means to bring the support 18 closer to the direction of the arrow 30, the support 18 moves upward and the print-receiving member 12 contacts the opposite roller 16. To do. When the support 18 further moves in the direction of the arrow 30, the transport roller shaft 22 moves downward relative to the support 18 against the force of the compression spring 28. When a predetermined mutual pressure force, which indicates a desired pressure force, is generated in the compression spring 28, the contact piece 35 is separated from the contact piece 34 by the actuating protrusion 38, whereby the movement drive is stopped. At this position where the predetermined pressing force of the conveying roller is obtained, the printing beam member 8 has an accurate writing interval with respect to the printing head 6 at this time, and the writing preparation of the printing device is completed.

Simultaneously with the completion of writing preparation, the conveying driving means for the conveying roller 10 and the printing head 6 is operated by a known method, and accordingly, the print-receiving member 12 is written row by row, for example.
During the approach of the support 18, the stopper 40 is moved from the actuated position shown in FIG. 1 to the non-actuated position shown in FIG. 2, which will be described in more detail later.

The transport roller 10 simultaneously measures the thickness of the print target member 12,
It operates to control the distance between the print head 6 and the print beam member 8. When the member to be printed 12 has a fast passage speed and a small thickness as seen in the case of register receipts, for example, the transport roller 10 reaches the support 18 at each step thickness when reaching each step. It is moved upward by a corresponding amount.
At this time, the actuating protrusion 38 separates from the intermediate contact piece 35 and the intermediate contact piece 35 contacts the upper contact piece 34, so that the moving drive means for the support 18 moves the support 18 upward, and as a result, the limit switch 32 is again moved. Take a neutral position. When the thickness of the receipt increases, the transport roller 10 accordingly moves downward relative to the support 18 and the intermediate contact piece 35 and the lower contact piece 36 come into contact with each other, so that the support 18 moves downward. The limit switch 32 is moved to the neutral position again, and at the same time, the transfer roller is moved to the neutral position.
10 has an accurate crimping force, and the printing beam member 8 has an accurate writing interval with respect to the printing head 6.

3 and 4 show schematic cross-sections of the printing device 2, in which it can be seen that the stopper 40 is in two possible positions. The stopper 40 is composed of a stopper plate 42 which is substantially perpendicular to the writing plane, and the stopper plate 42 is attached to the shaft via an arm 44 which is perpendicular to the stopper plate 42.
It is mounted in the printer housing 4 so as to be swingable around 46. A tension spring 48 is engaged with the arm 44, the free end of the tension spring 48 being fixedly connected to the support 18 at a fixing point 50. When the support 18 is in the lowered position, as shown in FIG. 3, the fixed point 50 lies slightly below the shaft 46 so that the stopper 40 is held in the actuated position as shown.
When the support 18 is approached in the direction of the arrow 30, the fixed point 50 also moves upward, and when it passes a specific dead point, the stopper 40 inclines to the left, and at this time, the stopper plate 42 moves the member to be printed. The member to be printed can be moved forward from the writing plane formed by 12. When the support 18 descends, the stopper 40 instantly takes the operating position again.

The movement of the support 18 in the direction of the arrow 20 is performed via the parallel link mechanism shown in FIG. A moving cross plate 52 is provided movably in the direction of arrow 54 parallel to the two longitudinal side plates of the support 18 and is connected to a moving drive means (not shown). Only the moving side plate 52 on the observer side is shown in FIG. Two link arms 56 move at the center of rotation 58 Horizontal plate 52
Is swingably coupled with. The other end of the link arm 56 is swingably connected to the support 18 at a rotation center point 60.
Two separate link arms 62 move at the center of rotation 64 Horizontal plate 52
Is swingably coupled with. The other end of the link arm 62 is swingable and, at the rotation center point 66, is provided with an outer slit 68 corresponding thereto so as to be movable within the printer housing,
It is provided with the support 18 through 78. When the movable horizontal plate 52 is moved to the right (FIG. 5), the support 18 moves upward, and when the movable horizontal plate 52 is moved to the left, the support 18 moves downward.

The functioning method of the parallel link mechanism will be described with reference to FIGS. 6 and 7. In FIG. 7, two link arms 56,
62 is shown in a position corresponding to the position shown in FIG. The support 18 is at a lower position where the print beam member is away from the print head and is a non-engagement position of the transport roller. When the movable cross plate 52 moves to the right (FIG. 7), the rotation center points 58 and 64 fixedly connected to the movable cross plate 52 are moved to the positions 58 'and 64' shown in FIG. .

The center of rotation 58 does not move vertically, so the center of rotation 58
60 is moved upward by the value of a, and at this time the rotation center point 60
Carries with it a support 18 fixedly connected thereto. The slit 68 formed in the print housing is the center of rotation 66.
Allows vertical movement of. The support 18 is likewise only vertically movable via a slit 70 formed in the support 18 facing the center of rotation 66, so that the support 18 can be lifted vertically upward without lateral movement.

FIG. 8 shows the printer housing 4 and the arrow 20 inside the housing.
1 again shows a printing device having a support 18 movable in the direction of the arrow, a carrying roller 10 provided on the support, a print beam member 8, and a print head 6 and a counter roll 16. Furthermore, a movable horizontal plate 52 that can move horizontally on the side facing the observer can be seen. The horizontal movement of the moving horizontal plate 52 is performed via a driving member 72 (see FIGS. 8 and 9) which is engaged in the moving horizontal plate 52, and the driving member 72 is formed in the moving horizontal plate 52. Recessed
Engage within 74.

FIG. 9 shows a movement drive means 76 which is designed as a so-called position adjustment drive means. The movement driving means 76 has an electric motor 78, and the electric motor 78 is rotatable in both directions and drives the screw spindle 80. A spindle nut 82 is provided on the screw spindle 80, and the spindle nut 82 is moved in the direction of arrow 84 by the screw spindle 86. The spindle nut 82 is connected to the drive member 72. Movement drive means
76 is used in combination with the equipment of the conveying roller 10 shown in FIGS. 1 and 2. The movement drive means is controlled by the limit switch 32 as described above, so that the support body 18 undergoes an ascending or descending movement, respectively, depending on the direction of rotation of the electric motor 78.

FIG. 10 shows the movement drive means 86 formed as a linear position adjustment means with two switching positions. The movement drive means 86 is formed as a U-shaped link in the described embodiment 1
It has an arm lever 88 and one arm lever 88 is mounted in its printer housing at its lower end so that it can swing about an axis 90. The lever 88 has a drive member 72, and the drive member 72 moves the movable horizontal plate 52 in the direction of arrow 92. The lever 88 is swung by the magnetic switch 94 within two switching positions corresponding to the disengaged position or the engaged position of the conveying roller. The actuating member 96 is connected to a U-shaped link 98, and the U-shaped link 98 is driven in the switching direction of the magnetic switch 94 via a horizontal shaft 100 provided on the link 88. A compression spring 102 is provided between the bottom of the leg of the U-shaped link 98 and the shaft 100. When the magnetic switch 94 is retracted, it is linked via the U-shaped link 98.
Accompanied by 88, in this way actuates the moving cross plate 52 and the support 18, so that the transport rollers come into contact with the counter roller 16 or with the print-receiving member 12 provided between them. When the retracting motion is further applied to the operating member 96, the intermediate spring 102
Is compressed, and its spring force determines the pressing force of the transport roller. The position is restored by a restoring spring that engages with an appropriate position such as the movable cross plate 52, but a detailed description thereof will be omitted.

FIG. 11 shows two transport rollers 110 provided on one transport roller shaft 122. For example, the conveying roller shaft as shown in FIGS. 1 and 2 is mounted so as to be swingable in the printer housing although one end 104 is fixed in position, while the other end 106 is compressed by a compression spring 128 in the direction of arrow 10. It is installed so as to resist the force of. The counter roller 116 is provided on a common pendulum balance 112, and the pendulum balance 112 can also swing around the pendulum shaft 114 in the plane of the transport roller shaft 122. In this way, the pendulum balance 112 follows the respective swinging angle positions of the transport roller shafts, so that the two transport rollers 110 always form a uniform pressure force on the print carrier 12 in contact with the opposing roller 116. It

FIG. 12 shows schematically a support 18 with transport rollers 210. The transport roller shaft 222 is mounted on the support 18 and is movable in the direction of arrow 212 together with the support 18. The drive motor 214 is fixedly provided in the print housing 4. A link joint shaft 216 is provided between the drive motor 214 and the transport roller shaft 222, and the link joint shaft 216 enables the support 18 to move in the height direction while forming a drive coupling.

FIG. 13 shows the support 18 provided with a single transport roller shaft 322 with two transport rollers 310. This support is also swingable in the direction of arrow 312 so that the printer housing 4
It is installed inside. In this embodiment, the drive motor 314 is also provided on the support 18 and moves integrally with the support 18. The drive feed between the drive motor 314 and the transport roller 322 can thus be made rigid.

The control device for controlling the pressure of the conveying roller against the opposing roller can be used for controlling the pressure of the printing target member against the heating writing edge member. For this purpose, for example, the counter roller in FIG. 1 can be replaced by a heating writing edge member known per se. In this case, neither the print head 6 nor the print beam member 8 is needed.

The print head 6 in FIG. 1 may be a heat transfer edge member known per se which extends in the print line direction, in which case the heat transfer edge member is loaded by a spring member which is not described here and which is perpendicular to the writing plane. There is. In this case the support
The print beam member 8 contacts the print head 6 when 18 is moved closer. When the compression spring 28 is compressed to a predetermined value, the support 18
When the movement drive to the print head 6 is cut off, the print head 6 is similarly pressed against the print beam member 8 as described above.

[Brief description of drawings]

FIG. 1 is a schematic side view of a printing apparatus in a state where a support member and a printing beam member are separated from each other to prepare a member to be printed, and FIG. 2 is a view corresponding to FIG. And FIG. 4 are detailed views of the printer shown in FIG. 1 or 2, respectively, and FIG. 5 is a detailed view of the support moving component shown in FIGS. 1 to 4, FIG. 6 and FIG. FIG. 8 is an enlarged detailed view from FIG. 5, FIG. 8 is a detailed view of a support moving component shown in FIGS. 5 to 7, and FIG. 9 is a support moving drive means shown in FIG. FIG. 10 is a schematic view showing a position adjusting drive means, FIG. 10 is a detailed view corresponding to FIG. 9 provided with a linear movement drive means having two switching positions, and FIG. 11 is a schematic front view showing a conveying roller and a pressure bonding roller cooperating therewith. FIGS. 12A and 12B show a supporting body having a conveying roller and a conveying driving means provided outside the supporting body. The schematic representation, FIG. 13 is a schematic, showing a support having a conveying roller, and a conveyance drive means provided on the support. 2 ... printing device, 4 ... printing device housing 6 ... printing head, 8 ... printing facing member 10,110,210,310 ... conveying roller 12 ... printed member, 16,116 ... facing roller 18 ...... Support, 22,122 …… Conveyor roller shaft 24 …… Conversion lever 28,102,128 …… Spring transmission member 32 …… Limit switch, 34,35,36 …… Contact piece 40 …… Stopper, 56, 62 ... Link mechanism 76, 86 ... Moving drive means 88, 98 ... U-shaped link 96 ... Moving member (operating member), 102 ... Intermediate spring 104, 106 ... End portion, 112 ... Pendulum balance 114 ...... Pendulum shaft 214, 314 ...... Conveyance drive means

Continuation of the front page (56) References Actually open 59-50751 (JP, U) Actually open 56-104950 (JP, U) Actually open 59-35056 (JP, U) Actually open 60-152 (JP , U) Actual development Sho-56-123252 (JP, U) Actual development Sho-59-181756 (JP, U)

Claims (4)

[Scope of utility model registration request] 1. A line printing apparatus, wherein a printing facing member (8) is provided below a surface of a member to be printed and on a common support (18) that is adjustable relative to the surface of the member to be printed. ) And at least one transport roller (10), and a print head (6) that cooperates with the print facing member (8) fixed above the surface of the printing target member, and a facing that cooperates with the transport roller (10). And a roller (16), and the transport roller (10) includes a support (1
8) is fixed on the printing support member (8) is fixed on the support (18), the support (18), one end of the support is parallel to the long side plate of the support. Mounted on a parallel link mechanism including two link arms (56, 62) pivotally mounted on a freely movable cross plate (52) and the other end pivotally mounted on the support; One end of each of the two link arms is pivotally attached to the movable lateral plate and the support, respectively, and the other link arm has one end pivotally attached to the movable lateral plate and the other end thereof. It is slidably mounted in a vertical direction in a slit provided in a side plate of the support body and extending in the vertical direction. The movable lateral plate is attached to the support body (18) via elastic transmission means (98, 100, 102). Is connected to the adjusting drive means (94) for The reaching means is a one-arm lever (88) one end of which is swingably attached to the printer housing (4), and the actuating member (96) of the adjustment drive means (94) is attached to the one-arm lever. The adjustment of the print facing member (8) with respect to the transport roller (10) includes the one arm lever (88) acting via the intermediate spring (102), and the transport roller (10) causes the transport roller (10) to face the opposite roller. (16) or conveying roller (10) and counter roller (1
When engaged with the print-receiving member (12) arranged between the print head (6) and the print facing member (8) or the print-receiving member (12), a predetermined distance is maintained. A line printer selected to remain. 2. A stopper (40) which is substantially perpendicular to the printing surface and extends in the row direction is provided in the printer housing (4), and the stopper (40) is in the passage of the member to be printed (12). Movably mounted between an operative position projecting to and a retracted non-actuating position, the support (1
The stopper (40) moves to the support (18) so that the stopper (40) takes the non-operating position while the support (18) moves in the opposite direction while the stopper (40) takes the operating position while the (8) moves in the crimping direction. The printing device according to claim 1, wherein the printing device is freely connected. 3. A conveying roller (10) arranged on a support (18) is connected to a conveying drive means (314) fixedly and drivably connected to the support (18). The printing device according to claim 2, wherein the utility model registration is claimed. 4. A carrying roller (10) provided on a support (18) is provided in the printer housing (4) and is connected to the carrying roller (210) via a link joint shaft (216). The printing device according to claim 1, wherein the utility model is registered.