JP4494009B2 - Head pressure adjustment device - Google Patents

Description

  The present invention relates to a head pressure adjusting device that adjusts the head pressure of a thermal head that performs printing by sandwiching a printing medium and an ink ribbon between a platen roller and transferring ink from the ink ribbon to the printing medium, and in particular, thermal printing. The present invention relates to a head pressure adjusting device that adjusts the strength of the head pressure of the head.

  In a thermal transfer type printing apparatus that performs printing by sandwiching a printing medium and an ink ribbon between a platen roller and a thermal head and transferring ink from the ink ribbon to the printing medium, the thermal head is attached to the platen roller by a predetermined head. Printing is performed while pressing with pressure, but if the print medium becomes thick or stiff, and the rigidity of the print medium increases, good print quality is achieved unless the head pressure is set high. Can't get. Therefore, there is a printing apparatus provided with an adjustment mechanism that can adjust the strength of the head pressure of the thermal head according to the thickness of the printing medium (see, for example, Patent Document 1).

However, the conventional technique has a problem that the structure of the adjusting mechanism for adjusting the strength of the head pressure is complicated and requires many parts, so that the apparatus becomes expensive.
Japanese Patent Laid-Open No. 2001-213018

  The present invention has been made in view of such problems, and its object is to adjust the strength of the head pressure with a simple structure and simple operation, and the rigidity of the print medium changes. The present invention also provides a head pressure adjusting device that can easily cope with this.

In order to solve the above problems, the present invention has the following configuration.
The gist of the invention described in claim 1 is to adjust the head pressure of a thermal head that performs printing by sandwiching a printing medium and an ink ribbon between platen rollers and transferring ink from the ink ribbon to the printing medium. A head pressure adjusting device comprising: a pressing unit that presses the thermal head toward the platen roller; and a contact surface that is in contact with the pressing unit and sets a pressing force of the pressing unit. A cam and a contact surface that is connected in the axial direction of the platen roller of the first adjustment cam and that contacts the pressing means and sets the pressing force of the pressing means stronger than that of the first adjustment cam are formed. The second adjustment cam, the first adjustment cam, and the second adjustment cam are slid in the axial direction of the platen roller, and the contact surface of either the first adjustment cam or the second adjustment cam is moved forward. Has a slide operation means for contact with the pressing means, wherein the first adjusting cam and the second adjusting cam, with being mounted around the platen roller parallel to the rotation axis, into contact with the pressing means A plurality of contact surfaces are respectively formed, and by rotating the rotating shaft, the contact surfaces that contact the pressing means are changed, and the left-right balance of the head pressure of the thermal head can be adjusted. It exists in the characteristic head pressure adjusting device.
According to a second aspect of the present invention, there is provided a front cover that covers the pressing means, the first adjustment cam, and the second adjustment cam and that has an opening for operating the slide operation means. When the contact surfaces preset as the slide surfaces of the first adjustment cam and the second adjustment cam are in contact with the pressing means, the sliding operation is performed from the opening formed in the front cover. It means resides in head pressure adjusting device according to claim 1, wherein a is operational.
According to a third aspect of the present invention, there is provided a contact surface between the first adjustment cam and the second adjustment cam other than a slide surface of the first adjustment cam and the second adjustment cam. 3. A head pressure adjusting device according to claim 2 , further comprising a slide prevention cam for preventing the first adjustment cam and the second adjustment cam from sliding when contacting each other.

  The head pressure adjusting device according to the present invention is provided in a row in the axial direction of a platen roller of a first adjustment cam formed with a contact surface that is in contact with the pressing portion and sets a pressing force of the pressing portion. With a simple structure, the second adjustment cam can be selected by sliding on the second adjustment cam formed with an abutting surface that is in contact with the pressing portion and sets the pressing force of the pressing portion stronger than that of the first adjustment cam. In addition, it is possible to adjust the strength of the head pressure with a simple operation, and it is possible to easily cope with changes in the rigidity of the print medium.

  Furthermore, the head pressure adjusting device of the present invention is configured such that a plurality of contact surfaces that contact the pressing portion are formed on the first adjustment cam and the second adjustment cam, and the plurality of contact surfaces can be changed. Therefore, the adjustment mechanism that adjusts the strength of the head pressure and the mechanism that adjusts the left-right balance of the head pressure can be used together, and the strength of the head pressure can be adjusted with a simple structure and simple operation. There is an effect that can be done.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing a configuration of a printing apparatus in which an embodiment of a head pressure adjusting device according to the present invention is used, and FIG. 2 shows a configuration of an embodiment of the head pressure adjusting device according to the present invention. FIG. 3 is a perspective view showing a configuration of the head pressure adjusting device shown in FIG. 1 before the cover is attached, and FIG. 4 is a configuration of the head pressure adjusting device shown in FIG. 1 after the cover is attached. FIG. 5 is a front view showing the configuration of the head pressure adjusting device shown in FIG. 6 is a diagram showing the configuration of the adjustment unit located on the left side shown in FIG. 5, (a) is a cross-sectional view taken along the line OO ′ of FIG. 5 of the adjustment cam for thin paper, and (b) FIG. 6 is a cross-sectional view of the thick paper adjusting cam taken along the line PP ′ shown in FIG. 5, and FIG. FIG. 7 is a diagram showing the configuration of the adjustment unit located at the center shown in FIG. 5, (a) is a QQ ′ sectional view of the adjustment cam for thin paper shown in FIG. 5, and (b) is It is RR 'sectional drawing of the adjustment cam for cardboard shown in FIG. 5, (c) is a front view of a center cam. 8 is a diagram showing the configuration of the adjustment unit located on the right side shown in FIG. 5, (a) is an SS ′ cross-sectional view of the adjustment cam for thin paper shown in FIG. 5, and (b) is It is TT 'sectional drawing of the adjustment cam for cardboard shown in FIG. 5, (c) is a front view of a center cam.

  As shown in FIG. 1, a printing apparatus using the head pressure adjusting device 1 of the present embodiment is mounted with a printing medium 2 such as a roll-shaped continuous seal body in which stickers are temporarily attached to a mount at regular intervals. The print medium 2 and the ink are disposed between the print medium supply reel 3, the ribbon supply reel 5 on which the roll-shaped ink ribbon 4 is mounted, the platen roller 6 that conveys the print medium 2 and the ink ribbon 4, and the platen roller 6. The head pressure adjusting device 1 includes a thermal head 7 that performs printing by transferring ink from the ink ribbon 4 to the print medium 2 while sandwiching the ribbon 4, and a take-up reel 8 that winds up the transferred ink ribbon 4. Thus, the thermal head 7 attached to the head support 10 supported by the support shaft 9 is pressed toward the platen roller 6. Reference numerals 11 and 12 in FIG. 1 are guide rollers that guide the conveyance of the ink ribbon 4.

  As shown in FIG. 2, the head pressure adjusting device 1 includes three pressing portions 13 that press the thermal head 7 toward the platen roller 6 and a head pressure setting portion 14 that sets the pressing force of the pressing portion 13. .

  The pressing portion 13 includes a columnar columnar member 131 in which a locking portion is provided around, a cylindrical member 132 provided around the columnar member 131, and between the locking portion of the columnar member 131 and the cylindrical member 132. The spring 133 is an interposed elastic member, and is configured to be stretchable by the spring 133.

  The thermal head 7 is pivotally supported by the support shaft 9 and is covered with a case 15 having three openings 152 formed on the upper surface. The three pressing portions 13 are respectively formed in the three openings 152 formed in the case 15. It is fitted. The three openings 152 are formed at the center of the printing range and the symmetrical positions in the direction orthogonal to the transport direction of the print medium 2 and the ink ribbon 4, and are fitted into the three openings 152, respectively. The thermal head 7 is configured to be pressed toward the platen roller 6 by the three pressing portions 13 mounted.

  The case 15 has both walls extending upward to form a pair of support plates 151, and is engaged with a case eye (not shown) to which the platen roller 6 is attached. A hook 153 that determines the distance between the platen roller 6 and the platen roller 6 is provided.

  The head pressure setting unit 14 includes a rotation shaft 141, adjustment units 142 to 144, a rotation operation unit 145, and a slide operation unit 146, and the adjustment unit 142 to 144, the rotation operation unit 145, and the rotation shaft 141. In the state in which the slide operation unit 146 is mounted, the adjustment units 142 to 144 are respectively positioned above the three pressing units 13 fitted in the three openings 152 formed in the case 15. The both walls of 15 are extended to a pair of support plates 151 formed to extend. The adjustment units 142 to 144 and the slide operation unit 146 are positioned only in the rotation direction of the rotary shaft 141. In the axial direction, the adjustment units 142 to 144 and the slide operation unit 146 can be slid together to rotate. The operation unit 145 is fixed to the rotating shaft 141.

  2 and 4 is a front cover that covers the head pressure adjusting device 1, and reference numeral 17 is a guide roller cover that covers the guide roller 12. As shown in FIG. 4, the front cover 16 is attached to the case 15 and covers the head pressure setting unit 14 excluding the rotation operation unit 145 from the front side, and the slide operation unit 146 from the front side. An opening 161 for operation and a locking portion 162 for locking the slide operation portion 146 are formed.

  Referring to FIG. 5, the adjustment unit 142 located on the left side in the drawing includes a central cam 142c, three thin paper adjustment cams 142a located on the left side of the central cam 142c, and three thick papers located on the right side of the central cam 142c. The adjustment portion 143, which is composed of the adjustment cam 142b and is located at the center in the figure, is a center cam 143c, three thin paper adjustment cams 143a located on the left side of the center cam 143c, and 3 located on the right side of the center cam 143c. The adjustment section 144, which is composed of two thick paper adjustment cams 143b and is located on the right side in the drawing, is located on the right side of the central cam 144c, three thin paper adjustment cams 144a located on the left side of the central cam 144c, and the central cam 144c. And three thick paper adjustment cams 144b. The adjustment cams of the adjustment units 142 to 144 are formed by being divided in the axial direction of the rotating shaft 141. This is for improving accuracy when manufactured by plastic molding, and there is a problem with accuracy. If not, it may be integrally formed. In the present embodiment, it is assumed that there is a reference surface for positioning the print medium 2 on the left side shown in FIG.

  As shown in FIG. 6, the thin paper adjustment cam 142a and the thick paper adjustment cam 142b are formed with a plurality of contact surfaces (A to E surfaces and slide surfaces) that contact the pressing portion 13 (cylindrical member 132). The contact surface is switched by rotating the rotation shaft 141 by operating the rotation operation unit 145. As shown in FIG. 6A, all the contact surfaces of the thin paper adjustment cam 142a are set at a distance X from the axis of the rotating shaft 141, and the thick paper adjustment cam 142b is shown in FIG. 6B. As shown in FIG. 4, all the contact surfaces are set to a distance X ′ longer than the distance X from the axis of the rotating shaft 141. Further, as shown in FIG. 6C, the central cam 142c is formed with a tapered surface for eliminating a step between the thin paper adjustment cam 142a and the thick paper adjustment cam 142b.

  As shown in FIG. 7, the thin paper adjustment cam 143a and the thick paper adjustment cam 143b are formed with a plurality of contact surfaces (A to E surfaces and slide surfaces) that contact the pressing portion 13 (cylindrical member 132). . As shown in FIG. 7A, the thin paper adjustment cam 143a has a distance X from the axis of the rotary shaft 141 and a plane D from the distance X from the axis of the rotary shaft 141. 7 is set to a short distance Y, and the E surface is set to a distance Z shorter than the distance Y from the axis of the rotary shaft 141. The thick paper adjusting cam 143b is formed on the A to C surfaces as shown in FIG. And the slide surface are at a distance X ′ longer than the distance X from the axis of the rotating shaft 141, the D surface is at a distance Y ′ longer than the distance Y from the axis of the rotating shaft 141, and the E surface is the axis of the rotating shaft 141. A distance Z ′ longer than the distance Z from the heart is set. Note that distance X: distance X ', distance Y: distance Y', and distance Z: distance Z 'are all set to be the same. Further, as shown in FIG. 7C, the central cam 143c has a tapered surface for eliminating a step between the thin paper adjustment cam 143a and the thick paper adjustment cam 143b.

  As shown in FIG. 8, the thin paper adjustment cam 144a and the thick paper adjustment cam 144b are formed with a plurality of contact surfaces (A to E surfaces and slide surfaces) that contact the pressing portion 13 (cylindrical member 132). . In the thin paper adjusting cam 144a, as shown in FIG. 8A, the A surface and the slide surface are shorter than the distance X from the axis of the rotating shaft 141, and the B surface is shorter than the distance X from the axis of the rotating shaft 141. The distances C to E are set to a distance Z shorter than the distance Y from the axis of the rotary shaft 141, and the cardboard adjustment cam 144b is formed as shown in FIG. The slide surface is a distance X ′ longer than the distance X from the axis of the rotation shaft 141, the B surface is a distance Y ′ longer than the distance Y from the axis of the rotation shaft 141, and the C to E surfaces are the rotation axis 141. The distance Z ′ is longer than the distance Z from the axis. Further, as shown in FIG. 8C, the central cam 144c is formed with a tapered surface for eliminating a step between the thin paper adjustment cam 144a and the thick paper adjustment cam 144b.

  In a state where the rotation shaft 141 is rotated by operating the rotation operation unit 145 and the slide surfaces of the adjustment units 142 to 144 are in contact with the pressing unit 13 (cylindrical member 132), as shown in FIG. Is locked to the locking portion 162 of the front cover 16, and the slide operation portion 146 can be operated from the opening 161 formed in the front cover 16. In this state, the slide operation unit 146 is operated and slid in the axial direction of the rotation shaft 141, so that the adjustment cam that contacts the pressing unit 13 (cylindrical member 132) is the thin paper adjustment cam 142 a, the thin paper adjustment cam 143 a, and The thin paper adjustment cam 144a, the thick paper adjustment cam 142b, the thick paper adjustment cam 143b, and the thick paper adjustment cam 144b can be selected.

  Note that when the adjustment portions 142 to 144 are slid in the axial direction of the rotation shaft 141, the upper surface of the cylindrical member 132 (the contact surface with the adjustment portions 142 to 144) is tapered, Since the center cam 142c, the center cam 143c, and the center cam 144c are also tapered, they can be slid smoothly.

Next, the head pressure adjustment operation of the present embodiment will be described in detail with reference to FIG.
FIG. 9 is a diagram for explaining the balance and strength of the head pressure adjusted by the head pressure adjusting operation of the head pressure adjusting device according to the embodiment of the invention.

  With the eye (not shown) on the housing side to which the platen roller 6 is attached and the hook 153 of the case 15 engaged, the rotation operation unit 145 is in a state where the distance between the case 15 and the platen roller 6 is determined. To rotate the rotating shaft 141 or slide the slide operating portion 146 in the axial direction of the rotating shaft 141 of the adjusting portions 142 to 144 and contact the pressing portion 13 (cylindrical member 132) of the adjusting portions 142 to 144 By changing the surface, the expansion / contraction state of the spring 133 of the pressing portion 13 is changed, and as a result, the pressing force by which the thermal head 7 is pressed toward the platen roller 6 by the pressing portion 13 is changed. That is, the longer the distance from the axial center of the rotating shaft 141 on the contact surfaces of the adjusting portions 142 to 144, the stronger the pressing force pressing the thermal head 7 toward the platen roller 6 by contracting the spring 133 of the pressing portion 13. Accordingly, the shorter the distance from the axis of the rotating shaft 141 on the contact surfaces of the adjusting portions 142 to 144, the weaker the pressing force that the spring 133 of the pressing portion 13 extends and presses the thermal head 7 toward the platen roller 6. Become.

  Therefore, by operating the rotation operation unit 145 to rotate the rotation shaft 141 and selecting the contact surface that contacts the pressing unit 13 (cylindrical member 132) as one of the A to E surfaces, as shown in FIG. In addition, the pressing force for pressing the thermal head 7 toward the platen roller 6 can be changed in the axial direction of the platen roller 6, and the left / right balance of the head pressure of the thermal head 7, that is, the axial balance of the platen roller 6 can be adjusted. Can be adjusted. The numerical values shown in FIG. 9 indicate that the large head pressure is high, but are not based on specific units.

  Further, the slide operation unit 146 is slid in the axial direction of the rotation shaft 141 of the adjustment units 142 to 144, and the adjustment cam that contacts the pressing unit 13 (cylindrical member 132) is the thin paper adjustment cam 142a, the thin paper adjustment cam 143a, and the thin paper. By selecting any one of the adjustment cam 144a, the thick paper adjustment cam 142b, the thick paper adjustment cam 143b, and the thick paper adjustment cam 144b, the thermal head 7 is directed toward the platen roller 6 as shown in FIG. The strength of the pressing force to be pressed can be changed, and the strength of the head pressure of the thermal head 7 can be adjusted.

  For example, when a thin and wide print medium 2 is used, the slide operation unit 146 is operated to press the thin paper adjustment cam 142a, the thin paper adjustment cam 143a, and the thin paper adjustment cam 144a. 13 (cylindrical member 132), and the rotation operation portion 145 is operated so that the A surface of the thin paper adjustment cam 142a, the thin paper adjustment cam 143a, and the thin paper adjustment cam 144a is applied to the pressing portion 13 (cylindrical member 132). By making contact, the head pressure of the thermal head 7 can be uniformly set to “2” in the axial direction of the platen roller 6 as shown in FIG. When the printing medium 2 having a large thickness and a narrow width is used, the slide operation unit 146 is operated to press the thick paper adjustment cam 142b, the thick paper adjustment cam 143b, and the thick paper adjustment cam 144b. 13 (cylindrical member 132), and the rotation operation unit 145 is operated so that the E surfaces of the thick paper adjusting cam 142b, the thick paper adjusting cam 143b, and the thick paper adjusting cam 144b are applied to the pressing unit 13 (cylindrical member 132). By bringing them into contact, as shown in FIG. 9, the head pressure of the thermal head 7 can be set to a strength of “2.5” only on the left side, that is, at a location close to the reference plane.

Next, another embodiment of the present invention will be described in detail with reference to FIG.
10A and 10B are views showing the configuration of the central cam of another embodiment of the head pressure adjusting device according to the present invention, wherein FIG. 10A is a cross-sectional view, and FIG. 10B is a front view.
In another embodiment, at least one of the central cams 142c, 143c, and 144c is replaced with a slide prevention cam 147 having a slide prevention function as shown in FIG. Are formed in a disk shape having a distance R from the axis of the rotary shaft 141 at locations corresponding to the A to E planes. The distance R is set to be longer than the distance X ′ that is the longest distance from the axis of the rotary shaft 141 in the contact surface of the adjustment cam, and the thin paper adjustment cam 142a, the thin paper adjustment cam 143a, and the thin paper adjustment cam. When any of the A to E surfaces of 144a, the thick paper adjustment cam 142b, the thick paper adjustment cam 143b, and the thick paper adjustment cam 144b is in contact with the pressing portion 13 (cylindrical member 132), the slide prevention cam 147 prevents sliding in the axial direction of the rotating shaft 141 of the adjusting units 142 to 144, and prevents the head pressure of the thermal head 7 from changing unintentionally by the user during use of the printing apparatus.

  As described above, according to the present embodiment, the thin paper adjustment cams 142a, 143a, 144a formed with the contact surfaces that contact the pressing portion 13 to set the pressing force of the pressing portion 13, and the thin paper The adjustment cams 142a, 143a, 144a are respectively connected in the axial direction of the platen roller 6, and come into contact with the pressing portion 13 so that the pressing force of the pressing portion 13 is set stronger than that of the thin paper adjustment cams 142a, 143a, 144a. By configuring the cardboard adjustment cams 142b, 143b, and 144b on which the surface is formed to be selectable, the head pressure can be adjusted with a simple structure and a simple operation.

  Furthermore, according to the present embodiment, a plurality of contact surfaces that contact the pressing portion 13 are formed on the thin paper adjustment cams 142a, 143a, and 144a and the thick paper adjustment cams 142b, 143b, and 144b. By configuring so that the surface can be changed, a mechanism for adjusting the strength of the head pressure and a mechanism for adjusting the left-right balance of the head pressure can be used together, with a simple structure, and It is possible to adjust the strength of the head pressure with a simple operation and to easily cope with changes in the rigidity of the print medium.

  Note that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a number, position, shape, and the like that are suitable for implementing the present invention. In each figure, the same numerals are given to the same component.

1 is a schematic configuration diagram showing a configuration of a printing apparatus in which an embodiment of a head pressure adjusting device according to the present invention is used. It is a disassembled perspective view which shows the structure of embodiment of the head pressure adjustment apparatus which concerns on this invention. It is a perspective view which shows the structure before the cover attachment of the head pressure adjusting device shown in FIG. It is a perspective view which shows the structure after the cover attachment of the head pressure adjusting device shown in FIG. It is a front view which shows the structure of the head pressure adjusting device shown in FIG. 6A and 6B are diagrams illustrating a configuration of an adjustment unit positioned on the left side illustrated in FIG. 5, in which FIG. 5A is a cross-sectional view taken along line OO ′ illustrated in FIG. 5 of an adjustment cam for thin paper, and FIG. FIG. 6 is a cross-sectional view taken along the line PP ′ shown in FIG. 5, and (c) is a front view of the central cam. 6A and 6B are diagrams illustrating a configuration of an adjustment unit located in the center illustrated in FIG. 5, in which FIG. 5A is a cross-sectional view taken along a line QQ ′ illustrated in FIG. 5 of an adjustment cam for thin paper, and FIG. FIG. 6 is a cross-sectional view taken along the line RR ′ shown in FIG. 5, and (c) is a front view of the central cam. 6A and 6B are diagrams illustrating a configuration of an adjustment unit positioned on the right side illustrated in FIG. 5, in which FIG. 5A is a cross-sectional view taken along line SS ′ illustrated in FIG. 5 of an adjustment cam for thin paper, and FIG. FIG. 6 is a cross-sectional view taken along line TT ′ shown in FIG. 5, and (c) is a front view of the central cam. It is a figure for demonstrating the balance and strength of the head pressure adjusted by the head pressure adjustment operation | movement of embodiment of the head pressure adjustment apparatus which concerns on this invention. It is a figure which shows the structure of the center cam of other embodiment of the head pressure adjusting device which concerns on this invention, (a) is sectional drawing, (b) is a front view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head pressure adjustment apparatus 2 Print medium 3 Print medium supply reel 4 Ink ribbon 5 Ribbon supply reel 6 Platen roller 7 Thermal head 8 Take-up reel 9 Support shaft 10 Head support 11, 12 Guide roller 13 Press part (pressing means)
14 Head pressure setting unit (head pressure setting means)
15 Case 16 Front Cover 17 Guide Roller Cover 131 Columnar Member 132 Cylindrical Member 133 Spring (elastic member)
152 Openings 151 Support plates 153 Hooks 141 Rotating shafts 142 to 144 Adjustment units 142a, 143a, 144a Thin paper adjustment cams (first adjustment cams)
142b, 143b, 144b Thick paper adjustment cam (second adjustment cam)
142c, 143c, 144c Central cam 145 Rotation operation part 146 Slide operation part (slide operation means)
147 Slide prevention cam 161 Opening 162 Locking part

Claims (3)

A head pressure adjusting device for adjusting a head pressure of a thermal head for performing printing by sandwiching a printing medium and an ink ribbon between a platen roller and transferring ink from the ink ribbon to the printing medium. A pressing unit that presses the head toward the platen roller; a first adjustment cam that is in contact with the pressing unit and that sets a pressing force of the pressing unit; and the first adjustment cam A second adjustment cam which is provided continuously in the axial direction of the platen roller and has a contact surface which is in contact with the pressing means and sets the pressing force of the pressing means stronger than that of the first adjustment cam; A slide in which the adjustment cam and the second adjustment cam are slid in the axial direction of the platen roller, and the contact surface of either the first adjustment cam or the second adjustment cam is brought into contact with the pressing means. Comprising an operation unit, wherein the first adjusting cam and the second adjusting cam, the platen roller and together are mounted around parallel axes of rotation, said pressing means and a plurality of contact surfaces in contact with each A head pressure adjusting device, wherein the head pressure adjusting device is formed and is capable of adjusting a left-right balance of head pressure of the thermal head by changing a contact surface contacting the pressing means by rotating the rotating shaft. . A front cover that covers the pressing means, the first adjustment cam, and the second adjustment cam and that has an opening for operating the slide operation means is provided, and the first adjustment cam and the second adjustment cam are provided. The slide operation means can be operated from the opening formed in the front cover when a contact surface preset as a slide surface of the cam is in contact with the pressing means. The head pressure adjusting device according to claim 1 . When the contact surface other than the slide surface of the first adjustment cam and the second adjustment cam is in contact with the pressing means between the first adjustment cam and the second adjustment cam, the first adjustment cam and the second adjustment cam The head pressure adjusting device according to claim 2, further comprising a slide prevention cam for preventing the adjustment cam and the second adjustment cam from sliding.

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