JP2009241370A - Printer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printer preventing recording quality from being lowered due to oscillation of a platen and allowing sure and easy detachment and attachment of the platen. <P>SOLUTION: A platen holding part 21 is provided for the purpose of attracting the platen 20 having a magnetic body 201 made of an iron material of a disc shape on the undersurface by an electromagnetic force and holding it. The platen holding part 21 is composed of a platen supporting plate 210 made of a magnetic material of disc shape, a cylindrical prop part 212 made of a magnetic material extended to the direction perpendicular to the platen supporting plate 210 from the nearly central part of the rear surface side of the platen supporting plate 210, an electromagnet 211 attached so as to contact the periphery of the prop part 212 and the undersurface of the platen supporting plate 210, and a prop base 213 attached in the lower part of the prop part 212. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a printing apparatus, and more particularly to a printing apparatus that can securely fix a removable platen.

  2. Description of the Related Art Conventionally, an ink jet printing apparatus that prints by placing a cloth such as a T-shirt on a flat platen and discharging ink from the ink jet head onto the cloth is known (for example, see Patent Document 1). This inkjet printing apparatus includes a flat platen that can reciprocate in the front-rear direction of the apparatus, and a T-shirt is set on the platen from the front side of the apparatus as a printing medium. Then, the printing position is shifted by moving the platen, and printing is performed by ejecting ink from the inkjet head to the T-shirt. Note that the T-shirt is removed from the front side of the apparatus after printing.

  In addition, such an ink jet printing apparatus is also known in which a platen is detachable so that the platen can be replaced in accordance with the size of a printing medium (see, for example, Patent Document 2). In this ink jet printing apparatus, a column is provided in the center of the lower surface of the platen, and the column is fitted and held in a fitting hole provided in the platen receiving plate.

JP 2004-284305 A JP 2005-103937 A

  In the ink jet printing apparatus as described in Patent Documents 1 and 2, since the platen is supported by the support column, there is a problem that vibration due to the movement of the platen affects the print quality. Further, in the ink jet printing apparatus described in Patent Document 2, the platen is sufficiently fitted because the platen support is merely fitted into the fitting hole provided in the platen receiving plate to hold the platen. There is a problem that it may rattle without being fixed. Further, although the fixing screw can be passed through the holding portion for holding the platen column, the platen column can be fixed, but the screw may be forgotten to be tightened. Moreover, when removing a platen, there also exists a problem that it takes the effort which loosens a screw.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a printing apparatus that prevents deterioration of recording quality due to wobbling of the platen and that can easily and reliably attach and detach the platen. To do.

  In order to solve the above problems, a printing apparatus according to a first aspect of the present invention includes a print head that performs printing on a surface of a printing medium, a platen having a holding surface that holds the printing medium, and a holding surface of the platen. A magnetic body provided on the surface opposite to the platen, a platen holding part for holding the platen in a detachable manner, and a platen holding part provided in the platen holding part, and attracting the magnetic body of the platen by electromagnetic force to fix the platen. A first electromagnetic force generating member.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, a shaft member that protrudes from a surface opposite to the holding surface of the platen, and the platen holding portion are provided. A gripping member that grips the shaft member and fixes the platen, and the gripping member includes a first member and a second member that can approach and separate from the first member, A grip driving member that grips the shaft member by moving the first member and the second member closer to and away from each other is provided.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the printing apparatus is provided with a print instruction means for instructing to perform printing by the print head, and printing is performed by the print instruction means. When an instruction is given, an energization control means for energizing the first electromagnetic force generating member is provided.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect of the invention, there is provided a removal instruction means for inputting an instruction to remove the platen, and the removal instruction means provides the platen with the removal instruction means. When a removal instruction is input, an energization stop control means for stopping energization of the first electromagnetic force generating member is provided.

  Further, in the ink jet recording apparatus of the invention according to claim 5, in addition to the structure of the invention of claim 2, the second member is made of a magnetic material, and the grip driving member is provided on the first member. The second member is a second electromagnetic force generating member that attracts the second member by electromagnetic force.

  According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect of the invention, the energization control unit is configured to perform the first and second operations when printing is instructed by the print instruction unit. The electromagnetic force generating member is energized.

  In addition, in the ink jet recording apparatus of the invention according to claim 7, in addition to the configuration of the invention of claim 6, the energization control means is configured such that when the removal instruction means gives an instruction to remove the platen, It is characterized in that energization to the first and second electromagnetic force generating members is stopped.

  In the printing apparatus according to the eighth aspect of the invention, in addition to the configuration of the invention according to any one of the first to seventh aspects, a locking portion is provided on a surface opposite to the holding surface of the platen. The platen holding portion is provided with a locked portion to which the locking portion is locked.

  In the printing apparatus of the invention according to claim 1, the first electromagnetic force generating member provided in the platen holding part that detachably holds the platen is provided with the magnetic material provided on the surface opposite to the holding surface of the platen. Since the platen is fixed by being pulled by force, the platen can be securely held without rattling.

  In the printing apparatus of the invention according to claim 2, in addition to the effect of the invention of claim 1, the holding member that is provided in the platen holding portion and holds the shaft member to fix the platen is the first member. And a second member that can be moved closer to and away from the first member, and the grip driving member can move the first member and the second member closer to and away from each other to grip the shaft member. Therefore, since the platen can be fixed by the first electromagnetic force generating member and the gripping member, the platen can be reliably fixed and rattling can be prevented.

  In the printing apparatus according to the third aspect of the invention, in addition to the effects of the first or second aspect, the energization control means generates the first electromagnetic force when printing is instructed by the print instruction means. Since the member is energized, the platen is fixed by the first electromagnetic force generating member during printing. Therefore, the platen is not fixed during printing, and the platen does not rattle.

  Further, in the printing apparatus of the invention according to claim 4, in addition to the effect of the invention of claim 3, a removal instruction means for inputting a platen removal instruction is provided, and the removal instruction means removes the platen. When an instruction is input, the energization stop control means stops energization of the first electromagnetic force generation member.

  Further, in the ink jet recording apparatus of the invention according to claim 5, in addition to the effect of the invention of claim 2, the second member is made of a magnetic material, and the grip driving member is provided on the first member. The second electromagnetic force generating member can attract the second member by electromagnetic force. Therefore, the platen shaft member can be held and fixed by the first member and the second member.

  In the printing apparatus according to the sixth aspect of the invention, in addition to the effect of the invention according to the fifth aspect, the energization control means is configured to provide the first and second electromagnetic forces when the printing instruction means instructs printing. Since the generating member is energized, the platen is securely fixed and held by the first and second electromagnetic force generating members during printing.

  Further, in the ink jet recording apparatus of the invention according to claim 7, in addition to the effect of the invention of claim 6, the energization control means is provided with a first and a second when the removal instruction means gives an instruction to remove the platen. Energization to the second electromagnetic force generating member can be stopped. Therefore, it is not necessary to individually stop energization of the first and second electromagnetic force generating members, and the platen can be easily removed.

  Further, in the printing apparatus of the invention according to claim 8, in addition to the effect of the invention according to any one of claims 1 to 7, a locking portion is provided on the surface opposite to the holding surface of the platen, Since the platen holding portion is provided with a locked portion to which the locking portion is locked, the platen and the platen holding portion are positioned by locking the locking portion to the locked portion. be able to.

  Hereinafter, a printing apparatus 1 according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the printing apparatus 1, and FIG. 2 is a right side view of the printing apparatus 1.

  As shown in FIG. 1, the printing apparatus 1 includes a frame 2 including a horizontal part 2v positioned at the bottom of the printing apparatus 1 and a vertical part 2h rising vertically from both ends of the horizontal part 2v when viewed from the front. And the guide rail 4 is constructed horizontally so that the upper part of the right-and-left vertical part 2h may be connected. The guide rail 4 is for guiding the movement of the carriage 5 in the longitudinal direction of the guide rail 4. A carriage motor 7 is provided near the left end of the guide rail 4, and a pulley 8 is provided near the right end. A carriage belt 9 is installed between the carriage motor 7 and the pulley 8 at a position below the guide rail 4. The carriage belt 9 is fixed to the back surface of the carriage 5, and is reciprocated in the longitudinal direction of the guide rail 4 (left and right direction in FIG. 1) by driving the carriage motor 7.

  Further, the casing 3 is provided on the frame 2 and covers and protects the inside of the printing apparatus 1. In FIG. 1, in order to show the inside of the casing 3 in detail, the casing 3 is depicted in a perspective manner by a two-dot chain line. Note that an operation panel 40 for operating the printing apparatus 1 is provided on the upper right side of the casing 3 in FIG.

  The carriage 5 has a substantially rectangular parallelepiped shape, and four piezoelectric inkjet heads 6 are mounted on the bottom surface thereof. The four inkjet heads 6 are provided corresponding to, for example, each of four color inks of cyan, magenta, yellow, and black. For example, 128 channels (not shown) for ejecting each ink are provided. Each has. Each channel is provided with a piezoelectric actuator (not shown) that is individually driven. From a fine jet nozzle (not shown) provided in the bottom surface of the ink jet head 6 corresponding to each channel. The ink droplets are controlled to be ejected downward.

  The left and right side surfaces of the printing apparatus 1 are respectively provided with cartridge housing portions 12 for detachably housing the ink cartridges 11 containing the respective inks. Each cartridge housing portion 12 can be equipped with two ink cartridges 11 each. Each ink cartridge 11 and each ink jet head 6 are connected to each other by a tube (not shown), and ink is supplied to each channel.

  Further, a purge unit 14 having a suction cap 13 that can be brought into close contact with and detached from the nozzle surface of each inkjet head 6 is provided at a position where the carriage 5 has moved to the right end of the guide rail 4. The purge unit 14 is provided with a suction pump (not shown). When each suction cap 13 is in close contact with the inkjet head 6, ink can be sucked through the suction cap 13. Yes. Further, when printing is not performed, the suction cap 13 covers the nozzle surface of the inkjet head 6 to prevent ink from drying.

  As shown in FIGS. 1 and 2, a platen drive mechanism 10 is installed on the horizontal portion 2v. Two bases 35 rise in the vertical direction from the horizontal part 2v in front of the horizontal part 2v, and two bases 36 stand in the vertical direction from the horizontal part 2v in the rear of the horizontal part 2v. (See FIG. 2). A substantially rectangular shape having four base portions 35 and 36 as apexes is formed. A pulley 28 is provided at the top of each base portion 35, and a pulley 29 is also provided at the top of each base portion 36. An endless belt 27 is installed on the left pulley 28 and the left pulley 29, and the endless belt 27 is installed on the right pulley 28 and the right pulley 29. Two platen rails 26 are provided above the two endless belts 27, respectively. Then, a substantially rectangular plate-like slide base 23 is fixed to the platen rail 26 and the endless belt 27 by a fixing member 24. A support column 212 rises from the slide base 23, and the support column 212 supports the platen 20. Further, a platen motor 25 is provided in the rear pulley 29, and when the platen motor 25 is driven, the fixing member 24 moves in the front-rear direction of the printing apparatus 1 along the platen rail 26.

  Next, the structure of the platen 20 and the platen holding portion 21 will be described with reference to FIGS. FIG. 3 is a plan view showing a state in which a T-shirt is fixed to the platen 20 as an example of a printing medium. FIG. 4 is a front view of the platen 20 and the platen holder 21. FIG. 5 is a bottom view of the platen 20. FIG. 6 is a plan view of the platen holding part 21.

  As shown in FIGS. 3 to 5, the platen 20 is provided with a substantially rectangular plate-like mounting portion 200 that holds a fabric such as a T-shirt at the top. One side of the mounting portion 200 on the front side of the printing apparatus 1 is cut into a V shape so that the T-shirt 100 that is a printing medium can be easily set. The shape of the mounting portion 200 of the platen 20 is not limited to this. If the surface facing the inkjet head is a plane parallel to the path along which the inkjet head 6 reciprocates, printing of the printing medium is performed. The shape and size may be different depending on the shape of the part.

  As shown in FIGS. 3 and 4, a columnar column 202 extends in a direction perpendicular to the placement portion 200 at the approximate center of the lower surface of the placement portion 200 of the platen 20. A magnetic body 201 made of a disk-shaped iron material is fixed to the lower surface of the mounting portion 200 around the support column 202. The magnetic body 201 is attracted by an electromagnet 211 described later.

  As shown in FIGS. 4 and 5, the magnetic body 201 is provided with cylindrical engagement protrusions 203 and 204 so as to be fitted into engagement holes 215 and 216 of a platen receiving plate 210 described later. Yes. Therefore, the platen 20 can be aligned with respect to the platen holding portion 21, and it is possible to prevent the placement portion 200 of the platen 20 from rotating in the horizontal direction and being displaced. The engagement protrusions 203 and 204 correspond to “locking portions”, and the engagement holes 215 and 216 correspond to “locked portions”.

  Next, the structure of the platen holding part 21 will be described with reference to FIGS. The platen holding part 21 is provided to hold the platen 20. The platen holding portion 21 is extended in a direction orthogonal to the platen receiving plate 210 from a platen receiving plate 210 made of a disk-shaped magnetic material (for example, iron material) and a substantially central portion on the back side of the platen receiving plate 210. An electromagnet comprising a cylindrical support column 212 made of a magnetic material (for example, iron material) and a wound coil provided so as to be in contact with the outer periphery of the support column 212 and the lower surface of the platen receiving plate 210 211 and a column base 213 provided below the column 212. The support base 213 is fixed to the approximate center of the slide base 23 to support the support 212.

  As shown in FIG. 6, the platen receiving plate 210 is a circular iron plate in plan view, and a circular opening 214 into which the column 202 of the platen 20 is inserted is formed in the center thereof. . Further, as shown in FIG. 4, a cylindrical hole 217 is formed in the column portion 212 in the longitudinal direction, and the opening 214 and the cylindrical hole 217 are connected to each other, and the column 202 of the platen 20 is connected. Is inserted into the cylindrical hole 217 of the support column 212 through the opening 214. The opening diameters of the opening 214 and the cylindrical hole 217 are slightly larger than the diameter of the column 202 of the platen 20 so that the column 202 of the platen 20 can be inserted and fitted. The inkjet head 6 corresponds to a “printing head”, the platen 20 corresponds to a “platen”, the magnetic body 201 corresponds to a “magnetic body”, and the platen holding portion 21 corresponds to a “platen holding portion”. The electromagnet 211 corresponds to the “first electromagnetic force generating member”, the support column 202 corresponds to the “shaft member”, and the support column portion 212 corresponds to the “gripping member”.

  Next, the electrical configuration of the printing apparatus 1 will be described with reference to FIGS. FIG. 7 is a block diagram showing an electrical configuration of the printing apparatus 1 according to the present embodiment, FIG. 8 is a conceptual diagram showing a storage area of the ROM 82, and FIG. 9 is a concept showing a storage area of the RAM 83. FIG.

  As shown in FIG. 7, the control unit 80 of the printing apparatus 1 is provided with a CPU 81 that controls the entire printing apparatus 1, and the CPU 81 receives various control programs executed by the CPU 81 via a bus 86. A stored ROM 82 and a RAM 83 for temporarily storing data are connected. Further, the CPU 81 includes a head driving unit 84 for driving a piezoelectric actuator provided in each channel of the inkjet head 6, a motor driving unit 85 for driving the carriage motor 7 and the platen motor 25, and an electromagnet 211. A platen holding mechanism driving unit 92 that controls on / off is connected via a bus 86.

  In addition, the CPU 81 is instructed to display the display 41 and the lamp 42 provided on the operation panel 40, the print button 43 that instructs printing to be started on the operation panel, and the printing stop. An input detection unit 88 that receives inputs such as a stop button 44 to perform, a platen removal button 45 for instructing removal of the platen, an audio control unit 89 that controls audio output of the speaker 46 provided on the operation panel, and a printing apparatus A communication control unit 90 for connecting to a PC 91 that is a higher-level device is connected via a bus 86.

  Next, as shown in FIG. 8, the ROM 82 stores an initial setting storage area 821 that stores initial values and the like that are set at the start of program execution, and various programs that control the printing apparatus 1. A program storage area 822 and the like are provided. Further, the ROM 82 is provided with various storage areas not shown.

  Next, as shown in FIG. 9, the RAM 83 has a print data storage area 831 for storing print data received from the PC 91 and a line counter storage area 832 for storing a line counter for measuring the number of lines currently printed. And are provided. Further, the RAM 83 is provided with various storage areas not shown.

  Moreover, the material of the mounting part 200 of the platen 20 is various, and a synthetic resin such as acrylic or a metal such as aluminum is conceivable.

  Next, a procedure for performing printing by the printing apparatus 1 will be described with reference to the flowchart of FIG. FIG. 10 is a flowchart of the printing procedure. First, the user transmits print data from the PC 91 to the printing apparatus 1. Then, the platen 20 suitable for the printing medium for printing the print data is mounted on the platen holding unit 21, and the printing medium is mounted on the platen 20. When the power of the printing apparatus 1 is turned on (S1), a driving current is passed from the platen holding mechanism driving unit 92 to the coil of the electromagnet 211 of the platen holding unit 21 under the control of the CPU 81, and the electromagnet 211 is turned on (S2). ). Then, the magnetic body 201 provided on the back surface of the mounting portion 200 of the platen 20 is attracted to the platen receiving plate 210 of the platen holding portion 21 by the electromagnet 211, and the platen 20 is fixed to the platen holding portion 21.

  Next, when the print button 43 is pressed (S3: YES), the CPU 81 determines whether or not the electromagnet 211 is ON (S4). This determination is made based on whether or not a driving current is flowing from the platen holding mechanism driving unit 92 to the electromagnet 211. When the electromagnet 211 is not turned on (S4: NO), a drive current is passed from the platen holding mechanism driving section 92 to the coil of the electromagnet 211 of the platen holding section 21, and the electromagnet 211 is turned on (S5). . Thereafter, the platen 20 is moved to the printing start position and printing is started (S6). Thereafter, the process returns to S3. By doing so, the electromagnet 211 of the platen holding unit 21 should be turned on after the power is turned on, but the electromagnet 211 is not turned off due to a malfunction of the platen holding mechanism driving unit 92 or the like. However, since the electromagnet 211 is always turned on when the print button 43 is pressed, the platen 20 is securely held by the platen holding portion 21 during printing, and the platen 20 may rattle or shake. Thus, it is possible to prevent the printing quality from deteriorating. If it is determined in S4 that the electromagnet 211 is ON (S4: YES), the platen 20 is moved to the print start position and printing is started (S6). Thereafter, the process returns to S3.

  When the platen removal button 45 is pressed or the PC 91 instructs to remove the platen 20 (S3: NO, S7: YES), the platen holding mechanism drive unit 92 flows to the coil of the electromagnet 211 of the platen holding unit 21. Is stopped and the electromagnet 211 is turned OFF (S8). If removal of the platen 20 is not instructed (S7: NO), the process returns to S3.

  As described above, the platen 20 of the printing apparatus 1 is supported by the support column 202 and can be attached to and detached from the platen holding unit 21. By turning on the electromagnet 211 of the platen holding unit 21, By attracting the magnetic body 201 to the platen receiving plate 210, the platen 20 can be reliably held with respect to the platen holding part 21. Therefore, vibration and rotation of the platen 20 can be reliably prevented. Therefore, the printing quality of the inkjet head 6 on the T-shirt 100 can be improved. The print button 43 corresponds to “printing instruction means”, the platen holding mechanism driving unit 92 corresponds to “energization control means”, the platen removal button 45 corresponds to “removal instruction means”, and the process of S8 The CPU 81 and the platen holding mechanism driving unit 92 that perform the processing correspond to the “energization stop control unit”.

  Next, the printing apparatus 1 according to the second embodiment of the present invention will be described with reference to FIGS. 11 to 13. Since most of the configuration of the printing apparatus 1 according to the second embodiment is the same as that of the printing apparatus 1 according to the first embodiment, only different points will be described. FIG. 11 is a plan view of the column portion 212 of the platen holding unit 21 of the printing apparatus 1 according to the second embodiment, and FIG. 12 is a block diagram illustrating an electrical configuration of the printing apparatus 1 according to the second embodiment. FIG. 13 is a plan view of the second electromagnet 219 of the support column 212 of the platen holding unit 21 of the printing apparatus 1 according to the second embodiment.

  In the printing apparatus 1 according to the second embodiment, as shown in FIG. 11, the column part 212 of the platen holding part 21 is vertically divided into two, and the first member 218, which is one member, has a second electromagnet. 219 is provided, and the other is a pressing member 220 movable by a support mechanism (not shown). And the 1st member 218 is being fixed to the support | pillar base 213 and the platen receiving plate 210, The pressing member 220 is comprised from a magnetic body (for example, iron material), and it can approach and space apart with respect to the 1st member 218. It is guided and guided by a guide member (not shown). Therefore, the pressing member 220 is not fixed to the column base 213 and the platen receiving plate 210.

  Then, as shown in FIG. 12, the second electromagnet 219 is turned on at the same time when the drive current is supplied by the platen holding mechanism driving unit 92 and the electromagnet 211 is turned on, as shown in FIG. The column 202 of the platen 20 is pressed and held by the first member 218 and the pressing member 220. At this time, the electromagnet 211 attracts and fixes the magnetic body 201 of the platen 20 to the platen receiving plate 210. Therefore, the platen 20 is fixed to the platen holding part 21 at two places. The first member 218 corresponds to the “first member”, the pressing member 220 corresponds to the “second member”, and the second electromagnet 219 corresponds to the “gripping drive member” and the “second electromagnetic force generating member”. Equivalent to.

  As described above, in the printing apparatus 1 according to the second embodiment, the platen 20 is fixed to the platen holding part 21 at two locations, so that the platen 20 can be more securely attached to the platen holding part 21. Can hold. Therefore, vibration and rotation of the platen 20 can be reliably prevented. Therefore, the printing quality of the inkjet head 6 on the T-shirt 100 can be improved.

  The printing apparatus of the present invention can be applied to a printing apparatus including a platen having a work surface capable of holding a printing medium.

2 is a front view of the printing apparatus 1. FIG. 2 is a right side view of the printing apparatus 1. FIG. 2 is a plan view showing a state where a T-shirt is held on a platen 20. FIG. 2 is a front view of a platen 20 and a platen holding part 21. FIG. 3 is a bottom view of the platen 20. FIG. 3 is a plan view of a platen holding unit 21. FIG. 1 is a block diagram illustrating an electrical configuration of a printing apparatus 1 according to an embodiment. 3 is a conceptual diagram showing a storage area of a ROM 82. FIG. 3 is a conceptual diagram showing a storage area of a RAM 83. FIG. It is a flowchart of a printing procedure. It is the top view which showed typically the structure of the support | pillar part 212 of the platen holding | maintenance part 21 of the printing apparatus 1 of 2nd embodiment. It is a block diagram which shows the electric constitution of the printing apparatus 1 of 2nd embodiment. It is the top view which showed typically the state at the time of operation | movement of the 2nd electromagnet 219 of the support | pillar part 212 of the platen holding | maintenance part 21 of the printing apparatus 1 of 2nd embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Printing apparatus 6 Inkjet head 20 Platen 21 Platen holding part 43 Print button 45 Platen removal button 81 CPU
92 Platen holding mechanism drive unit 200 Placement unit
201 Magnetic body 202 Support column 203, 204 Engagement protrusion 210 Platen receiving plate 211 Electromagnet 212 Support column 219 Second electromagnet 215, 216 Engagement hole 218 First member 220 Holding member

Claims (8)

A print head for printing on the surface of the printing medium;
A platen having a holding surface for holding the print medium;
A magnetic body provided on a surface opposite to the holding surface of the platen;
A platen holding part for detachably holding the platen;
A printing apparatus, comprising: a first electromagnetic force generating member that is provided in the platen holding portion and attracts the magnetic material of the platen by electromagnetic force to fix the platen. A shaft member protruding from the surface opposite to the holding surface of the platen;
A gripping member that is provided in the platen holding part and grips the shaft member to fix the platen;
The gripping member is composed of a first member and a second member that can approach and separate from the first member,
The printing apparatus according to claim 1, further comprising a grip driving member that grips the shaft member by moving the first member and the second member closer to and away from each other. Providing a print instruction means for instructing to perform printing by the print head;
The printing apparatus according to claim 1, further comprising an energization control unit configured to energize the first electromagnetic force generating member when printing is instructed by the print instruction unit. Providing a removal instruction means for inputting an instruction to remove the platen;
4. The apparatus according to claim 3, further comprising energization stop control means for stopping energization of the first electromagnetic force generating member when an instruction to remove the platen is input by the removal instructing means. Printing device.   The said 2nd member is comprised from a magnetic body, The said holding | grip drive member is provided in said 1st member, It is a 2nd electromagnetic force generation member which attracts the said 2nd member with an electromagnetic force. The printing apparatus as described.   6. The printing apparatus according to claim 5, wherein the energization control unit energizes the first and second electromagnetic force generation members when printing is instructed by the print instruction unit.   7. The energization control unit stops energization of the first and second electromagnetic force generation members when an instruction to remove the platen is given by the removal instruction unit. Printing device. A locking portion is provided on the surface opposite to the holding surface of the platen,
The printing apparatus according to claim 1, wherein the platen holding portion is provided with a locked portion to which the locking portion is locked.

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