TW201813829A - Printhead gap adjustment apparatus - Google Patents

Abstract

The invention relates to a printhead gap adjustment apparatus including a sliding base and an inkjet-cartridge frame. The sliding base has a top side, a bottom side and a first attached surface. The inkjet-cartridge frame has an attached wall, a fastened set, a radius-adjustable cam, a driving gear set and an elastic unit. The fastened set is disposed between the sliding base and the inkjet-cartridge frame and configured to clamp the sliding base and the inkjet-cartridge fame selectively for limiting the movement of the inkjet-cartridge fame relative to the sliding base. The elastic unit is disposed between the inkjet-cartridge frame and the bottom side of the sliding base. The radius-adjustable cam is disposed on the second attached surface and includes an outer edge to push against the top side of the sliding base. The driving gear set is disposed on the control surface and connected to the radius-adjustable cam in a shaft connection for rotating simultaneously. Consequently, the driving gear set can drive the radius-adjustable cam to rotate and the radius-adjustable cam for accomplishing the purpose of adjusting the height of the inkjet-cartridge frame relative to the sliding base.

Description

 Print head spacing adjustment device  

The present invention relates to an adjustment device for an inkjet printer, and more particularly to a printhead spacing adjustment device for an inkjet printer.

Wide Format Inkjet printers, which are commonly used for large image output, often require the use of different types of printing media. However, different types of printing media have different thickness differences. When printing, the difference in the distance between the printhead of the ink cartridge and the inked surface of the printing medium directly affects the quality of the printed image output. Therefore, the control of the distance between the print head and the print medium is very important, and the precise value that can be adjusted must be quite fine.

As printing resolution increases and inkjet ink droplets become smaller, the precision requirements of the body structure increase. Any height or spacing adjustment must not affect precision and maintain accuracy. The print head spacing adjustment device is used to adjust the distance between the print head and the printing medium. The conventional print head spacing adjustment device is often realized by a linear stroke adjustment mechanism of a ball screw and a guide rod combination, but a ball screw and a guide rod are used. The combined linear stroke adjustment mechanism can not only accurately and accurately adjust the distance between the print head and the printing medium, and the cost is high, the size is large, and the maintenance is not easy. In addition, another prior art technique uses a linear stroke adjustment mechanism in which a gear and a rack are combined to achieve a pitch adjustment function, but a linear stroke adjustment mechanism in which a gear and a rack are combined often wears due to an inability to bear stress. There will also be backlash problems, which will affect the accuracy of the pitch adjustment.

Therefore, how to develop a print head spacing adjusting device to solve the problems faced by the prior art is a problem that is extremely urgent in the field.

The purpose of the present invention is to provide a print head spacing adjusting device which is suitable for an ink jet printer, which can accurately and accurately realize the adjustment between the printing head and the printing medium, and has low cost, easy maintenance and manufacture. Simple, reliable, and capable of fine-tuning and control.

Another object of the present invention is to provide a print head spacing adjusting device which utilizes the reliability of the cam and the convenience of the gear set, supplemented by the advantages of springs and other various designs, not only overcomes the backlash problem of the conventional technology, but also operates thereof. Accurate fine-tuning is achieved with a simple, complex mechanism. In addition, with the motor equipment (such as the motor and solenoid valve), an inductive component can be easily added to instantly measure the distance from the paper, and send a signal to the control unit to determine whether the target value has been reached to control the motor operation. , can achieve the purpose of automatic adjustment. Furthermore, the print head spacing adjusting device of the present invention can be easily disposed in a high-end type ink jet printer under the limit of increasing cost, thereby enhancing product competitiveness.

In order to achieve the foregoing purposes, the present invention provides a print head height adjusting device including a sliding base and an ink truss. The sliding base has a top edge, a bottom edge and a first bonding surface. The ink cartridge includes a receiving groove, a fitting wall, a clamping group, an elastic member, a variable radius cam, and a driving gear set. The accommodating slot is configured to receive at least one ink cartridge, wherein the ink cartridge has a row of print heads. The bonding wall has a second bonding surface and a regulating surface, wherein the second bonding surface is opposite to the first bonding surface. The clamping group is disposed between the sliding base and the ink cartridge, and selectively clamps the sliding base and the ink tray to restrict movement of the ink tray relative to the sliding base. The elastic element is connected to the bottom edge of the ink sill and the sliding base. The variable radius cam is disposed on the second bonding surface and has an outer circumference that abuts the top edge of the sliding base. The driving gear set is disposed on the regulating surface, and is coaxially connected with the variable radius cam and synchronously rotatable, wherein the driving gear set drives the variable radius cam to rotate to adjust the height of the ink cymbal frame relative to the sliding base.

1‧‧‧Print head spacing adjustment device

10‧‧‧Slide rails

11‧‧‧Sliding base

111‧‧‧ top side

112‧‧‧Bottom

112a‧‧‧ positioning slot

113‧‧‧First mating surface

114‧‧‧Linear slider

115‧‧‧ Guide convex

116‧‧‧Guided perforation

117‧‧‧ Limit bumps

12‧‧‧Ink rack

121‧‧‧ accommodating slots

122‧‧‧Fitting wall

1221‧‧‧Second mating surface

1222‧‧‧Control surface

1223‧‧‧ earpieces

1224‧‧‧ guiding slot

1225‧‧‧through slot

1226‧‧‧ Groove

123‧‧‧Clamping group

1231‧‧‧Auxiliary clips

1231a‧‧‧screw

1231b‧‧‧Clamp

1231c‧‧ Spring

1232‧‧‧ clip arm

1232a‧‧‧ shaft end

1232b‧‧‧Latch

1232c‧‧‧force arm end

1232d‧‧‧ convex

1232e‧‧ ‧ spring

124‧‧‧Variable radius cam

124a‧‧‧ outer periphery

124b‧‧‧stops

125‧‧‧Drive gear set

1251‧‧‧First gear

1252‧‧‧second gear

1253‧‧‧ Third gear

1254‧‧‧ worm

126‧‧‧Flexible components

127‧‧ ‧ motor

128‧‧‧ solenoid valve

128a‧‧‧Operation Department

129‧‧‧Detection unit

129a‧‧Detection Department

129b‧‧‧Rotation

2‧‧‧Printing platform

3‧‧‧Ink 匣

31‧‧‧Print head

4‧‧‧Printing media

5‧‧‧Adjustment button

6‧‧‧ Gear cover

7‧‧‧Sensor unit

D‧‧‧Distance

R1‧‧‧ minimum radius

R2‧‧‧Max radius

Fig. 1 is a view showing a part of the structure of a print head spacing adjusting device of the present invention applied to an ink jet printer.

2A and 2B are schematic views showing the exploded structure of the print head spacing adjusting device of the first preferred embodiment of the present invention at different viewing angles.

Fig. 2C is a side view showing the exploded structure of the head spacing adjusting device of Fig. 2A.

Fig. 3A is a view showing the combined structure of the head pitch adjusting device of Fig. 2A.

3B and 3C are respectively a front view and a rear view showing the head spacing adjusting device of Fig. 3A.

Fig. 3D is a front view showing a part of the structure of the head spacing adjusting device of Fig. 3A of the present invention.

4A and 4B respectively disclose the clamping group actuation relationship diagram of the print head spacing adjusting device of the present invention.

Figures 5A and 5B respectively show the viewpoint and rear view of the print head spacing adjusting device of the present invention before the ink creel is adjusted to the lowest point.

Figures 6A and 6B respectively show the viewpoint and rear view of the print head spacing adjusting device of the present invention before the ink creel is adjusted to the highest point.

Figure 7 is a schematic view showing the structure of the print head spacing adjusting device of the second preferred embodiment of the present invention.

Figure 8 is a block diagram showing the structure of the print head spacing adjusting device of the third preferred embodiment of the present invention.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in the various aspects of the present invention, and the description and drawings are intended to be illustrative and not limiting.

1 is a schematic view showing the structure of a print head spacing adjusting device of the present invention applied to an ink jet printer, and FIGS. 2A and 2B are a view showing the print head spacing adjusting device of the first preferred embodiment of the present invention. FIG. 2C is a side view showing the exploded structure of the head spacing adjusting device of FIG. 2A, and FIG. 3A is a sectional view showing the combined structure of the head spacing adjusting device of FIG. 2A, FIG. 3B Fig. 3C is a front view and a rear view, respectively, showing the head spacing adjusting device of Fig. 3A. As shown, the print head spacing adjustment device 1 of the present invention is suitable for use in an ink jet printer such as, but not limited to, a Wide Format Inkjet printer. The print head spacing adjusting device 1 is disposed on one of the slide rails 10 of the ink jet printer, and is arranged to adjust the print head 31 and the column of the ink cartridge 3 with respect to the printing platform 2 of the ink jet printer. The distance D between the four media. The print head pitch adjusting device 1 includes a slide base 11 and an ink yoke 12. The sliding base 11 has a top edge 111, a bottom edge 112, a first bonding surface 113 and at least one linear slider 114, wherein the linear slider 114 and the first bonding surface 113 are disposed opposite to each other, and the linear slider 114 is further The sliding base 11 is assembled to the slide rail 10, and the slide base 11 is slidable along the slide rail 10. The ink cartridge 12 includes a receiving groove 121, a bonding wall 122, a clamping group 123, a variable radius cam 124, a driving gear set 125, and an elastic member 126. The accommodating groove 121 is configured to accommodate at least one ink cartridge 3, wherein the ink cartridge 3 has a row of printing heads 31. The bonding wall 122 has a second bonding surface 1221 and a regulating surface 1222 disposed on opposite sides, wherein the second bonding surface 1221 is opposite to the first bonding surface 113 of the sliding base 11 . The clamping group 123 is disposed between the sliding base 11 and the ink yoke 12, and selectively clamps the sliding base 11 and the ink yoke 12 to restrict movement of the ink yoke 12 relative to the sliding base 11. The variable radius cam 124 is disposed on the second bonding surface 1221 and has an outer peripheral edge 124a that abuts the top edge 111 of the sliding base 11. The elastic member 126 is connected to the ear piece 1223 of the ink yoke 12 and the bottom edge 112 of the sliding base 11 to assemble the sliding base 11 upwardly and to slide the outer periphery 124a of the variable radius cam 124 against the top. The top edge 111 of the base 11 , wherein the ear piece 1223 extends outward from the second abutment surface 1221 of the conforming wall 122 . The driving gear set 125 is disposed on the regulating surface 1222 and coaxially coupled to the variable radius cam 124 and synchronously rotatable, wherein the driving gear set 125 drives the variable radius cam 124 to rotate to adjust the ink yoke 12 relative to the sliding base 11 The height is thereby used to achieve the adjustment of the distance between the print head 31 of the ink cartridge 3 and the printing medium 4.

In this embodiment, the bonding wall 122 can be further provided with at least one guiding groove 1224, and the sliding base 11 has at least one guiding protrusion 115 disposed on the first bonding surface 113 with respect to the guiding groove 1224. . When the first bonding surface 113 is in contact with the second bonding surface 1221, the guiding protrusion 115 is received in the corresponding guiding groove 1224, so as to limit the ink yoke 12 from being aligned with respect to the sliding base 11 motion. In this embodiment, the guiding direction of the guiding groove 1224 and the guiding protrusion 115 are perpendicular to the extending direction of the sliding rail 10, in other words, the sliding rail 10 extends along the X-axis direction, and the guiding groove 1224 and the guiding The protrusions 115 extend in the Z-axis direction, thereby restricting movement of the ink yoke 12 relative to the slide base 11 in the Z-axis direction, and restricting the ink yoke 12 relative to the slide base 11 Move along the X axis.

In this embodiment, the clamping group 123 includes at least two auxiliary clips 1231 and a clamping arm 1232, and the bonding wall 122 includes a through slot 1225 and at least two recesses 1226, wherein the at least two recesses 1226 are located at the The two abutting faces 1221 are located on both sides of the through slot 1225, and the sliding base 11 includes at least two guiding through holes 116. The at least two auxiliary clips 1231 are disposed adjacent to the top edge 111 of the sliding base 11 , and each auxiliary clip 1231 includes a screw 1231 a , a clamping block 1231 b and a spring 1231 c , wherein the screw 1231 a penetrates from the regulating surface 1222 of the bonding wall 122 . The wall 122 is fitted and penetrates the guide hole 116 of the sliding base 11 to be locked with one end of the block 1231b, and the other end of the block 1231b is aligned and received in the corresponding groove 1226. The spring 1231c is sleeved on the corresponding screw 1231a. Since the guide hole 116 of the fitting wall 122 allows the threaded screw 1231a to move in the perforation, the function of restricting the movement of the ink yoke 12 relative to the sliding base 11 in the Z-axis direction can also be achieved. In addition, the spring 1231c can provide a suitable pressing force to cause the abutment wall 112 of the ink truss 12 to conform to the sliding base 11. Due to the arrangement of the auxiliary clips 1231 on both sides, the ink yoke 12 can be smoothly moved in the Z-axis direction with respect to the slide base 11, and the ink yoke 12 and the slide base 11 can be prevented from being displaced in the Y-axis direction. Or gap.

In this embodiment, the ink yoke 12 further includes a latching member 1232b disposed on the lower edge of the second bonding surface 1221, and the sliding base 11 further includes a positioning groove 112a disposed on the first bonding surface. 113 is the opposite side. The clamping arm 1232 has a rotating shaft end 1232a and a force arm end 1232c. The rotating shaft end 1232a is pivotally connected to the bottom edge of the bonding wall 122 of the ink cartridge 12 through the latching member 1232b, and adjacent to the bottom of the sliding base 11 The side 112 extends from the bottom edge 112 of the sliding base 11 to the top edge 111 of the sliding base 11 through the positioning groove 112a of the sliding base 11. In addition, the arm end 1232c of the clamp arm 1232 passes through the through groove 1225 of the bonding wall 122 and is located on the same side as the regulating surface 1222. The clamping arm 1232 is pivoted to the pivot end 1232a of the latching member 1232b as an axis, and the clamping arm 1232 can be clamped against or away from the bottom edge 112 of the sliding base 11 by the force of the lever arm 1232c. The positioning groove 112a selectively encloses the ink yoke 12 and the sliding base 11 to restrict movement of the ink yoke 12 relative to the sliding base 11.

It should be noted that, in this embodiment, the first bonding surface 113 of the sliding base 11 and the second bonding surface 1221 of the bonding wall 122 of the ink truss 12 are adhered to each other through three force applying points. . At least two auxiliary clips 1231 are disposed adjacent to the top edge 111 of the sliding base 11 , and the second bonding surface 1221 of the bonding wall 122 of the ink cartridge 12 is directed toward the first bonding surface 113 of the sliding base 11 . top. The clamping arm 1232 is pivoted to the pivot end 1232a of the latching member 1232b as an axis, and is biased by the clamping arm 1232 against the positioning groove 112a of the bottom edge 112 of the sliding base 11 after the force arm end 1232c is biased. Thereby, the first bonding surface 113 of the slide base 11 and the second bonding surface 1221 of the bonding wall 122 of the ink cartridge 12 can be bonded to each other through the three urging points. In this embodiment, since the distance from the arm end 1232c of the clamp arm 1232 to the rotation end 1232a is greater than the distance between the contact point of the clamp arm 1232 and the positioning groove 112a and the rotation end 1232a, the lever principle can be utilized on the force arm end 1232c. A small force is applied to obtain a large clamping force at the aforementioned contact point, whereby the clamp arm 1232 can be utilized as a mechanism for restricting movement of the ink yoke 12 relative to the slide base 11. In an embodiment, when the clamping arm 1232 is disengaged from the positioning slot 112a, the driving gear set 125 can drive the variable radius cam 124 to rotate, and the top edge of the sliding base 11 is abutted by the outer peripheral edge 124a of the variable radius cam 124. 111, thereby adjusting the height of the ink yoke 12 relative to the sliding base 11. When the clamp arm 1232 abuts against the top positioning groove 112a, the drive gear set 125 cannot drive the variable radius cam 124 to rotate.

In the present embodiment, the variable radius cam 124 corresponds to different radii at different angles, and the variable radius cam 124 is preferably a snail type cam. Since the distance of the ink yoke 12 relative to the sliding base 11 is related to the radius corresponding to the contact point of the outer peripheral edge 124a of the variable radius cam 124 against the top edge 111 of the top sliding base 11, and corresponding to the different contact points Since the radius of the variable radius cam 124 is different, the adjustment of the distance between the printing head 31 and the printing medium 4 can be achieved by driving the variable gear cam 124 to rotate by the driving gear set 125.

In this embodiment, the print head spacing adjusting device 1 further includes a motor 127 and a solenoid valve 128. The motor 127 is disposed on the ink cartridge 12 and coupled to the driving gear set 125 to drive the driving gear. Group 125 is active. The solenoid valve 128 is disposed on the ink cartridge 12 and includes an actuation portion 128a coupled to the arm end 1232c of the clamp arm 1232 and configured to control the clamp arm 1232 to abut or disengage from the bottom of the slide base 11 The positioning groove 112a of the side 112 is thereby used to selectively clamp the ink yoke 12 and the sliding base 11 by the clamp arm 1232. In the present embodiment, the automatic adjustment of the distance between the printing head 31 and the printing medium 4 can be realized by the arrangement of the motor 127 and the electromagnetic valve 128.

Fig. 3D is a front view showing a part of the structure of the head spacing adjusting device of Fig. 3A of the present invention. In the present embodiment, the drive gear set 125 includes a first gear 1251, a second gear 1252, a third gear 1253, and a worm 1254. The first gear 1251 is coaxially coupled with the variable radius cam 124 and can be synchronized. Rotate. The second gear 1252 is coaxially coupled to the third gear 1253 and synchronously rotatable, and the second gear 1252 and the third gear 1253 are single machine components, wherein the first gear 1251 is toothed with the third gear, thereby The gear 1253 can drive the first gear 1251 to rotate. The worm 1254 is directly coupled to the drive shaft of the motor 127, and the worm 1254 is coupled to the second gear 1252, whereby when the motor 127 is actuated, the worm 1254 can be actuated, and the worm 1254 can drive the second gear 1252 and the third The gear 1253 rotates, thereby driving the first gear to rotate 1251. In addition, the drive gear set 125 can also function as a speed reduction mechanism, so that the output of the motor 127 is driven by the deceleration of the drive gear set 125 to drive the variable radius cam 124, which provides adjustment accuracy and increased torque. In some embodiments, the diameter of the first gear 1251 is greater than the diameter of the second gear 1252, and the diameter of the second gear 1252 is greater than the diameter of the third gear 1253, but is not limited thereto.

4A and 4B are diagrams showing the clamping group actuation relationship of the print head spacing adjusting device of the present invention, respectively. As shown in FIGS. 3A, 3B, 3C, 3D, 4A, and 4B, the solenoid valve 128 is disposed on the top side of the ink yoke 12, and the actuating portion 128a is on the same side as the regulating surface 1222. The arm end 1232c of the clamp arm 1232 extends through the through hole 1225 of the bonding wall 122 and is connected to the actuating portion 128a of the solenoid valve 128. In one embodiment, the clamping arm 1232 further includes an elastic member 1232e and a positioning convex portion 1232d. The elastic member 1232e is sleeved on the positioning convex portion 1232d and abuts against the regulating surface 1222 and the clamping arm 1232. When the solenoid valve 128 is in the unactivated state, as shown in FIG. 4A, the actuating portion 128a of the solenoid valve 128 extends outwardly from the body of the solenoid valve 128, and the arm end 1232c of the clamp arm 1232 is coupled to the actuating portion 128a. The clamping arm 1232 is clamped against the positioning groove 112a of the bottom side 112 of the sliding base 11 at a portion adjacent to the rotating shaft end 1232a, so that the ink yoke 12 cannot move in the Z-axis direction with respect to the sliding base 11. When the solenoid valve 128 is enabled, as shown in FIG. 4B, the actuating portion 128a of the solenoid valve 128 is pulled back to the body of the solenoid valve 128. Since the arm end 1232c of the clip arm 1232 is coupled to the actuating portion 128a, the arm is clamped. The portion of the 1232 that is adjacent to the pivot end 1232a is disengaged from the positioning groove 112a of the bottom side 112 of the slide base 11, thereby allowing the ink yoke 12 to move in the Z-axis direction with respect to the slide base 11. In this case, the motor 127 can drive the driving gear set 125 to rotate, and the driving gear set 125 drives the variable radius cam 124 to rotate, so that the outer peripheral edge 124a of the variable radius cam 124 abuts the sliding base at a different contact point. The top edge 111 of the 11 is used to adjust the height of the ink yoke 12 relative to the sliding base 11 to achieve the adjustment of the spacing between the print head and the printing medium.

5A and 5B respectively show the viewpoint and the rear view of the print head spacing adjusting device of the present invention before the ink tray is adjusted to the lowest point. Figures 6A and 6B respectively show the viewpoint and rear view of the print head spacing adjusting device of the present invention before the ink creel is adjusted to the highest point. When the print head spacing adjusting device 1 is to adjust the height of the ink yoke 12, the solenoid valve 128 is first activated, and the actuating portion 128a of the solenoid valve 128 is pulled back to the body of the solenoid valve 128, and is driven by the actuating portion 128a. The clamping arm 1232 is disengaged from the positioning groove 112a of the bottom side 112 of the sliding base 11, that is, as shown in FIG. 4B, at this time, the motor 127 is actuated to actuate the driving gear set 125, and the variable radius cam 124 is driven by the driving gear set 125. Turning, 俾 performs height adjustment of the ink truss 12. In the present embodiment, the variable radius cam 124 has a maximum radius R2 and a minimum radius R1, and the outer circumference 124a is formed by decreasing the maximum radius R2 to the minimum radius R1. When the outer peripheral edge 124a of the variable radius cam 124 abuts against the top edge 111 of the sliding base 11 at the contact point of the minimum radius R1, the difference in relative height between the sliding base 11 and the ink truss 12 is minimized, and the result is as shown in FIG. 5A. Figure and Figure 5B. When the outer peripheral edge 124a of the variable radius cam 124 abuts the top edge 111 of the sliding base 11 at the contact point of the maximum radius R2, the relative height difference between the sliding base 11 and the ink yoke 12 is the largest, and the result is as shown in FIG. 6A. Figure and Figure 6B show. In an embodiment, the top edge 111 of the sliding base 11 has a limiting protrusion 117, and the variable radius cam 124 further has a stopping portion 124b disposed between the maximum radius R2 and the minimum radius R1. The stop portion 124b can cooperate with the limit projection 117 to limit the range of rotation of the variable radius cam 124.

In the foregoing embodiment, the print head spacing adjusting device 1 further includes a detecting unit 129 corresponding to the driving gear set 125 and disposed on the regulating surface 1222 of the bonding wall 122 to detect the driving gear set 125 rotating the variable radius cam. The angle of rotation of 124. The motor 127, the electromagnetic valve 128 and the detecting unit 129 are electrically connected to a control unit (not shown), and the detecting unit 129 transmits the detection result to the control unit, so that the control unit can control the motor 127 according to the detection result or Stop working. In one embodiment, the detecting unit 129 includes a detecting portion 129a and a rotating portion 129b. The rotating portion 129b is coaxially connected to the driving gear set 125 and the variable radius cam 124 and can rotate synchronously. When the ink cartridge 12 of the print head spacing adjusting device 1 is adjusted to the lowest point (as shown in FIG. 5A) or the highest point (as shown in FIG. 6A), the rotating portion 129b of the detecting unit 129 is the side. The detecting unit 129a detects that the control unit can control the motor 127 to stop operating, so that the driving gear set 125 cannot be further rotated in the original rotating direction, thereby preventing the motor 127 from excessively rotating and causing damage to the parts.

Figure 7 is a schematic view showing the structure of the print head spacing adjusting device of the second preferred embodiment of the present invention. In the present embodiment, the print head pitch adjusting device 1a is connected to FIGS. 2A to 2C, 3A to 3D, 4A to 4B, 5A to 5B, and 6A. The print head spacing adjusting device 1 shown in FIG. 6B is similar, and the same component numbers denote the same elements, structures and functions, and will not be described again. Different from the foregoing embodiment, the print head spacing adjusting device 1a replaces the motor 127 in the foregoing embodiment with an adjustment button 5, and the solenoid valve 128 and the detecting unit 129 are omitted. The adjusting button 5 has a tooth portion and is toothed with the second gear 1252 of the driving gear set 125. The driving gear set 125 can be actuated by the manual rotation adjusting knob 5, and the variable radius is driven by the driving gear set 125. The cam 124 rotates. After the user manually pulls the clamping arm 1232 out of the positioning groove 112a of the bottom edge 112 of the sliding base 11, the user can directly rotate the adjusting knob 5 to activate the driving gear set 125, and the driving gear set is driven by the driving gear set. 125 drives the variable radius cam 124 to rotate, thereby adjusting the height of the ink yoke 12 relative to the sliding base 11.

Figure 8 is a block diagram showing the structure of the print head spacing adjusting device of the third preferred embodiment of the present invention. In the present embodiment, the print head pitch adjusting device 1b is different from FIGS. 2A to 2C, 3A to 3D, 4A to 4B, 5A to 5B, and 6A. The print head spacing adjusting device 1 shown in FIG. 6B is similar, and the same component numbers denote the same elements, structures and functions, and will not be described again. Different from the foregoing embodiment, the print head spacing adjusting device 1b replaces the motor 127 in the foregoing embodiment with an adjustment button 5, and the detecting unit 129 is omitted. The adjusting button 5 also has a tooth portion that is toothed to the second gear 1252 of the driving gear set 125, whereby the driving gear set 125 can be actuated by the manual rotation adjusting knob 5, and the variable radius is driven by the driving gear set 125. The cam 124 rotates. In addition, the print head spacing adjusting device 1b further includes a gear cover 6 and a sensing unit 7. The gear cover 6 is disposed outside the adjustment button 5 to assemble and protect the adjustment button 5 when the adjustment button 5 is not used. The sensing unit 7 is disposed on the gear cover 6 with respect to the position of the adjusting button 5, and is connected to the electromagnetic valve 128. When the gear outer cover 6 is disengaged and the adjusting button 5 is exposed, the electromagnetic valve 128 is actuated to pull the action portion. 128a, the actuating portion 128a pulls the clip arm 1232 away from the positioning groove 112a of the bottom edge 112 of the sliding base 11. At this time, the user can directly rotate the adjustment knob 5 to activate the driving gear set 125, and the driving gear set 125 drives the variable radius cam 124 to rotate, thereby adjusting the height of the ink yoke 12 relative to the sliding base 11. . Of course, the present invention is not limited to the position and the operation mode set by the sensing unit 7, and may be applied as long as the adjustment button 5 is to be used for the adjustment operation, and will not be described herein.

In summary, the present invention provides a print head spacing adjustment device, which is suitable for an inkjet printer, which can accurately and accurately adjust the distance between the print head and the print medium, and has low cost and easy maintenance. Simple manufacturing, high reliability, and the need for stepless fine-tuning and control. In addition, the reliability of the cam and the convenience of the gear set, combined with the advantages of springs and other various designs, not only overcome the backlash problem of the conventional technology, but also the simple operation and the need for complicated mechanisms to achieve precise fine adjustment. . In addition, with the motor equipment (such as the motor and solenoid valve), an inductive component can be easily added to instantly measure the distance from the paper, and send a signal to the control unit to determine whether the target value has been reached to control the motor operation. , can achieve the purpose of automatic adjustment. Furthermore, the print head spacing adjusting device of the present invention can be easily disposed in a high-end type ink jet printer under the limit of increasing cost, thereby enhancing product competitiveness.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

Claims (12)

 A printing head spacing adjusting device includes: a sliding base having a top edge, a bottom edge and a first bonding surface; and an ink tray, comprising: a receiving groove, configured to accommodate at least one Ink cartridge, wherein the ink cartridge has a row of printing heads; a bonding wall having a second bonding surface and a regulating surface, wherein the second bonding surface is opposite to the first bonding surface; Between the sliding base and the ink yoke, and selectively clamping the sliding base and the ink yoke to restrict movement of the ink yoke relative to the sliding base; an elastic element is connected to the ink yoke The ink truss and the bottom edge of the sliding base; a variable radius cam disposed on the second bonding surface and having an outer periphery against the top edge of the sliding base; and a driving gear a set, disposed on the regulating surface, and coaxially connected to the variable radius cam and synchronously rotatable, wherein the driving gear set drives the variable radius cam to rotate to adjust the height of the ink cymbal frame relative to the sliding base .    The print head spacing adjusting device of claim 1, wherein the print head pitch adjusting device is disposed in an ink jet printer, the ink jet printer comprising a slide rail and a printing platform. The print head spacing adjustment device is disposed on the slide rail and relative to the printing platform to adjust the distance between the print head and a printing medium, wherein the sliding base comprises at least one linear slider, and The first bonding surface is oppositely disposed and is configured to fit the sliding base to the sliding rail, and the sliding base can slide along the sliding rail.    The print head spacing adjusting device of claim 1, wherein the bonding wall has at least one guiding groove, and the sliding base has at least one guiding protrusion disposed on the first bonding surface And relative to the guiding groove, wherein the guiding protrusion is received in the guiding groove to limit the movement of the ink tray relative to the sliding base.    The printing head spacing adjusting device of claim 1, wherein the clamping group comprises at least two auxiliary clamping members, the bonding wall comprises at least two grooves on the second bonding surface, and the sliding base The seat includes at least two guiding through holes, wherein the at least two auxiliary clamping members are disposed adjacent to the top edge of the sliding base, and each of the auxiliary clamping members comprises: a screw extending from the regulating surface of the bonding wall a guiding hole extending through the sliding base; a clamping block, one end of the clamping block is locked with the screw, and the other end of the clamping block is aligned and received in the groove; A spring is sleeved on the screw.    The print head spacing adjusting device of claim 1, wherein the clamping group comprises a clamping arm, and the ink tray comprises a latching member disposed on a lower edge of the second bonding surface, the sticker The sliding wall includes a through groove, and the sliding base includes a positioning groove disposed on the other surface opposite to the first bonding surface, wherein the clamping arm includes: a rotating shaft end, and the ink is pivotally connected to the ink through the latching member a bottom edge of the affixing wall of the truss, adjacent to the bottom edge of the sliding base, and passing through the positioning groove of the sliding base from the bottom edge of the sliding base; and a force arm end, Passing through the through groove of the bonding wall and on the same side of the regulating surface; wherein the clamping arm is clamped or disengaged from the positioning groove of the sliding base to selectively clamp the ink tray and the A sliding base that limits movement of the ink yoke relative to the sliding base.    The print head spacing adjustment device of claim 5, further comprising a solenoid valve disposed on the ink cartridge and including an actuation portion, wherein the actuation portion and the force arm end of the clamp arm Connected.    The print head pitch adjustment device of claim 1, further comprising a motor disposed on the ink cartridge and coupled to the drive gear set for driving the drive gear set to actuate.    The print head gear adjustment device of claim 7, wherein the drive gear set comprises: a first gear coaxially coupled to the variable radius cam and synchronously rotatable; a second gear; a third gear coaxially coupled to the second gear and rotatable in synchronization with the first gear; and a worm coupled to the second gear and coupled to the motor; wherein the motor drives the motor The worm is actuated, and the worm drives the second gear and the third gear to rotate, thereby driving the first gear to rotate.    The print head spacing adjustment device of claim 1, further comprising an adjustment button disposed on the control surface and coupled to the drive gear set for driving the drive gear set to actuate.    The print head pitch adjusting device of claim 1, wherein the variable radius cam has a maximum radius and a minimum radius, and the outer circumference is formed by decreasing the maximum radius to the minimum radius.    The print head spacing adjusting device according to claim 10, wherein the sliding base has a limiting protrusion, and the variable radius cam has a stopping portion disposed at the maximum radius and the minimum radius. And wherein the limiting protrusion cooperates with the stopping portion to limit the rotation range of the variable radius cam.    The print head spacing adjustment device of claim 1, further comprising a detecting unit disposed on the regulating surface of the bonding wall and corresponding to the driving gear set to detect the driving gear set Rotate one of the variable radius cams to rotate the angle.