Heuer, Wilhelm

A punching device (PU) includes a punching member (1), a pin (2) that protrudes one end portion (21) and the other end portion (22) thereof in the second direction (D2) from the punching member (1), a holder (3) that is coupled to the one end portion (21) and the other end portion (22), and a guide (4) that accommodates the punching member (1). The guide (4) has pin insertion holes (40). The one end portion (21) and the other end portion (22) protrude to outside the guide (4) through the pin insertion holes (4). The holder (3) has a fitting hole (30), and the guide (4) is fitted into the fitting hole (30) such that the holder (3) is held so as to be movable along an outer circumferential surface of the guide (4). The fitting hole (30) has a recessed portion (31) that is recessed outward in a radial direction. The guide (4) has a protruding portion (41) that is positioned within the recessed portion (31).

The inkjet recording apparatus (100) includes a recording head (1), a cleaning member (2), and a container member (3). The container member (3) includes a containing part (31) which has an upwardly opening recessed area (310) and in which detergent supplied from above is contained in the recessed area (310), and a base part (32) which adjoins the containing part (31) in a first direction (D1) perpendicular to an up/down direction. The containing part (31) has a discharge hole (311) extending through the recessed area (310) in the up/down direction, and supplies the cleaning member (2) with the detergent flowing out downward from the discharge hole (311). An upper surface (32S) of the base part (32) is higher in liquid repellency to the detergent than an upper surface (31S) of the containing part (31).

The inkjet recording apparatus (100) includes a recording head (1), a cleaning member (2), a container member (3) which, by being pressed from above to below, is displaced from a first position to a second position and which, while in the second position, accepts supply of detergent, and a supply member (5) which is placed above the container member (3) to supply the container member (3) with the detergent. The container member (3) includes a containing part (31) for accepting supply of the detergent, and a base part (32) which adjoins the containing part (31) in a first direction (D1) perpendicular to an up/down direction. The supply member (5) presses the base part (32) from above to below without making contact with the containing part (31) so that the container member (3) is displaced from the first position to the second position.

The inkjet recording apparatus (100) includes a head unit (HU), a cleaning member (2), and a container member (3) which, by being pressed from above to below, is displaced from a first position to a second position, the container member (3) functioning in the second position to supply the cleaning member (2) with a detergent. The container member (3) includes a containing part (31) for containing the detergent, and a base part (32) which adjoins the containing part (31) in a first direction (D1) perpendicular to an up/down direction. The head unit (HU) has a head base (11), and the head base (11) presses the base part (32) from above to below without making contact with the containing part (31) so that the container member (3) is displaced from the first position to the second position.

An inkjet recording apparatus (1) includes a recording head (52), an ink container (81), an ink feed portion (8), a driving mechanism (70), a timer (78), a home position detection portion (77), and a control portion (7). The ink feed portion (8) includes a subsidiary tank (83, 85)), an ink flow passage (89, 94, 98), and a syringe pump (88) having a cylinder (881) and a piston (882). When performing a purging operation using the syringe pump (88), the control portion (7) performs a pressing operation by pressing the piston (882) at the home position with a previously determined set pressing amount and then, using the timer (78), counts the movement time after starting a pulling operation until the piston (882) reaches the home position. If the movement time is shorter than a threshold value, it is judged that a fault is present in the ink feed portion (8).

A sheet drying apparatus (10) includes a conveyance portion (20), a drying portion (40), and a control portion (90). The conveyance portion (20) conveys a sheet (P) on which an image has been formed with ink containing moisture. The drying portion (40) has a heater (43) that heats the sheet (P), and includes a heating unit (41) that can be raised and lowered between a heating position for heating the sheet (P) with a heater (43) and a retracted position away from the conveyance portion (20), and a unit ascent-descent mechanism (87) that raises and lowers the heating unit (41). When a jam of the sheet (P) is detected between the conveyance portion (20) and the heating unit (41), the control portion (90) turns off the supply of power to the heater (43), stops the conveyance portion (20), arranges the heating unit (41) at the heating position until the temperature in the heating unit (41) falls below a first temperature, and, after the temperature in the heating unit (41) falls below the first temperature, raises the heating unit (41) from the heating position to the retraction position.

A sheet conveying device (20) includes a pair of conveying rollers (21) and shutter members (30, 31). The shutter member (30, 31) has a body portion (32) with a substantially equal radius to a driving roller (21a) and a regulating portion (33) protruding radially outward from the outer circumferential edge of the body portion (32) to regulate the leading end of a sheet (S). The regulating portion (33) has a contact surface (33a) struck by the leading end of the sheet (S) and a locking portion (33b) formed at the boundary between the body portion (32) and the contact surface 33a and locking the leading end of the sheet S. N pairs of shutter members (30, 31) (where n is an integer of two or more) are disposed symmetrically left to right from inward to outward along the sheet width direction, and the m th pair of shutter members (31) (where m is an integer of one or more but n-1 or less) from inward along the sheet width direction has the locking portion (33b) formed radially outward compared to the (m+1)th pair of shutter members (30) adjacent outward along the sheet width direction.

Magnetic one-component toner includes a toner base particle containing at least a binder resin and a magnetic powder and an external additive attached to its surface. The binder resin contains an amorphous polyester resin and a crystalline polyester resin containing an aliphatic diol with a carbon number of 3 or more but 9 or less. The amount of crystalline polyester resin added is 5 mass% or less relative to the amorphous polyester resin. Let Tg1 be the glass transition point measured using a differential scanning calorimeter when temperature is first raised and let Tg2 be the glass transition point measured when, after the Tg1 measurement, temperature is lowered and raised again, then Tg(45) and Tg(25), which are the values of Tg1 measured after standing still at 45°C and 25°C, respectively, for 100 hours, satisfy 0 < Tg2 - Tg(45) < 5 and 4 < Tg2 - Tg(25) < 10.

An image forming apparatus (100) includes an image carrying member (1a-1d), a charging device (1a-2d), an exposure device (5), a developing device (3a-3d), an intermediate transfer belt (8), a cleaning brush (23), an image density sensor (50), and a control portion (90). The control portion (90) is capable of executing a cleaning performance determination mode for determining cleaning performance of the cleaning brush (23). The cleaning performance determination mode includes: a reference image formation process of forming a reference image (C1-K1) on the intermediate transfer belt (8); and a first bare-surface-measurement process of detecting a reference-image (C1-K1) formation area, using the image density sensor (50), after the intermediate transfer belt (8) has rotated once. When a fluctuation range of an output waveform of the image density sensor (50) in the first bare surface measurement process is equal to or less than a threshold value, it is determined that the cleaning performance of the cleaning brush (23) is normal.

An image forming apparatus (100) includes an image carrying member (1a to 1d), a charging device (2a to 2d), an exposure device (5), a developing device (3a to 3d), a toner container (4a to 4d), a toner concentration sensor (31), a toner charge amount detection portion (81), and a control portion (80). The developing device (3a to 3d) includes a developer carrying member (30) carrying a two-component developer and develops an electrostatic latent image into a toner image. The toner concentration sensor (31) detects a toner concentration in the developing device (3a to 3d). The toner charge amount detection portion (81) detects a toner charge amount in the developing device (3a to 3d). Based on a result of detection by the toner concentration sensor (31), the control portion (80) controls replenishment of the developing device (3a to 3d) with the toner from the toner container (4a to 4d). Based on the toner charge amount detected by the toner charge amount detection portion (81), the control portion (80) executes first target value changing control of changing a target value of the toner concentration.