JPH03129345A - Printing mechanism - Google Patents

Abstract

PURPOSE:To maintain the gap between a printing head and a platen with high accuracy, to separate them easily, to facilitate maintenance and to improve operability by providing a guide pin positioning a side plate and a lock pin locking a lock lever. CONSTITUTION:A locking claw 42 is formed on one edge of the lock lever 40, and is locked on the lock pin 27 when a printing part is fitted while the lock pin 27 enters a notch 37. To fit the printing part 22, a printing part 22 is positioned above a platen 20, the lock lever 40 is pressed to keep a lock release condition. At this state, the guide pin 26 is lowered so that it can be fitted in notches 31 and 37, and the pressing piece 43 of the lock lever 40 is released from fingers after the guide pin 26 abuts on the bottom of the notch 31. Then, a coil spring 44 rotates the lock lever 40 to attain a lock condition, thereby fitting the printing part 22 to a fitting member 21. Thus, the printing part is attachably and detachably fitted to the platen side, whereby the gap between the platen and the printing head is maintained at high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printing mechanism, and particularly to a printing mechanism used in various terminal devices.

[Conventional technology]

Conventionally, in a printing mechanism, a printing unit consisting of a print head and a scanning drive unit that scans the print head, and a platen have been configured as one unit.

[Problem to be solved by the invention]

For this reason, there is a problem that the printing section and the platen cannot be easily separated, making it difficult to handle them during maintenance. To deal with this, it is possible to configure the printing part and the platen to be freely separable, but this new idea shows that simply making them separable does not allow the gap between the printing part and the platen to be maintained with high precision. A problem arises.

The present invention is intended to solve the above-mentioned problems, and maintains the gap between the print head and the platen with high accuracy while allowing them to be easily separated, thereby facilitating maintenance. The purpose is to provide a printing mechanism with improved handling.

[Means to solve the problem]

To achieve the above object, the present invention provides a guide shaft for slidably supporting a print head, a side plate for fixing the guide shaft, a lock lever having a rotational fulcrum on the side plate, and a lock lever for supporting the print head. A printing mechanism is constituted by a mounting member that fixes the platen facing the platen, a guide pin that is provided on the member, and a lock pin that positions the side plate, and a lock pin that is locked by the lock lever. be.

[Effect]

Turn the lock lever attached to the side plate to release the lock, and bring the side plate into contact with the guide pin of the mounting member. In this state, the side plate is held by the guide pin, and the gap between the print head and the platen is maintained at a predetermined value. After this, when the lock lever is placed in the locked state, the side plate and the mounting member are integrally connected. The side plate can be easily removed by releasing the lock and lifting the side plate 1.

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

FIG. 2 shows a schematic configuration of the negative bag insertion machine. A negative bag 1 wound into a roll is inserted into the negative bag insertion machine.
0 is set. The negative bag 10 is made by folding one transparent sheet in half, and joining the lower part 10A and upper part 10B of this sheet at a predetermined pitch by joint parts 10C, and has a large number of bag parts 10D arranged in parallel. . A white band portion 10E printed in white is formed on the joint portion 10C and the lower part of the bag portion 100, and a frame number and the like are recorded on this white band portion 10E.

The negative bag 10 is loaded with a negative film 13 by a feed roller 12.
is transported towards the insertion position. During this multi-feeding, the white band portion 10E is detected by a mark sensor or the like, and based on this, the printing mechanism 14 according to the present invention is operated. This results in
The code 7 number and exposure correction data are printed in predetermined printing areas of the bag portion 10D and the white band portion 10E. Bag part 10 with printing
D stops at the film insertion position, where the feed roller 15
Then, the negative film 13 is inserted by the feed roller 16. During this insertion, the number of frames is counted by a screen detection sensor (not shown), and when a predetermined number of frames, for example 6 frames, is reached, the cutter 17 is operated to cut into negative pieces 18. The negative piece 18 is then moved to the feed roller 16
It is completely inserted into the bag portion 10D. Although in the drawing, the feed roller 16 is located away from the entrance of the bag section 10D, it is actually placed close to the entrance of the bag section 10D, so that the negative piece 18 is completely placed inside the bag section 10D. It will be inserted. After inserting the negative piece 18 for one order into the bag portion 10D, the sheet counter ■9
is activated, and a perforation-like cutting line 10F is made at the joint of each order.

Thereafter, the negative bag 10 containing the negative pieces is wound up into a roll. Thereafter, the negative bag is cut out for each order and inserted into the DP bag along with the printed photograph.

The printing mechanism 14 includes a flat platen 20, a member 21 for attaching the platen 20 to a plate 29 of a negative bag holder on the negative bag inserting machine side, and a printing section detachably attached to the member 21. It is composed of 22. As shown in FIG. 1, the platen 20 consists of a base 23 and a platen main body 24 disposed above the base. The platen main body 24 is made of, for example, hard urethane rubber.

For installation, the member 21 is bent into an L-shape, and the vertical plate 25 has a pair of guide pins 26 for detachably attaching the printing section 22, and a lock pin 27 for locking the printing section 22. and protrude horizontally. The pair of guide pins 26 are arranged at both ends of the vertical plate 25. Further, the lock pin 27 is arranged between the pair of guide pins 26. A tapered circumferential groove 28 is formed in the guide pin 26, and the side plate 3 described later
The notch 31 of 0 is easily fitted. Moreover, this circumferential groove 28 allows the side plate 30 to be attached to the guide pin 2.
6 is prevented from moving in the axial direction, and the printing part is securely fixed when attached.

The printing unit 22 includes a print head 33, a pair of guide shafts 34 that support the print head 33, and a pair of side plates 30 that fix the guide shafts 34. The print head 33 is attached to the guide shaft 34 via a guide member 35 and is movable in the axial direction of the guide shaft 34 . Both ends of the guide shaft 34 are fixed to the side plate 30 via screws 36.

The guide pin 26 is attached to the lower edge of the side plate 30.
A rectangular notch 31 into which the holder fits, and a rectangular notch 37 into which the opening/pin 27 fits are formed. Further, a lock lever 40 is rotatably attached to the outer surface of the side plate 30 via a pin 41. A locking pawl 42 is formed at one end of the lock lever 40.
When the printing part is attached with the opening/pick pin 27 inside the notch 37, it is sometimes locked to the lock pin 27. A pushing piece 43 is bent at the other end of the opening lever 40, and by pushing the pushing piece 43, the locking lever 40 is rotated to release the engagement with the locking pin 27.

Further, the lock lever 40 is biased in the locking direction by a coil spring 44, and its rotation is restricted by a stopper 45.

Note that the reference numeral 46 in the figure is an ink ribbon placed close to the print surface of the print head 33, and as is well known, this is wound up and stored in a cassette case 47 shown in FIG. Further, a timing belt (both not shown) of a scanning drive unit is attached to the guide member 35, as is well known, for moving the print head 30 along the guide shaft 34.

Next, the operation of this embodiment will be explained. When attaching the printing part 22, the printing part 27 is positioned above the platen 20, and while the long lever 40 is pressed to release the lock, it is lowered so that the guide pins 26 fit into the respective notches 31 and 37. When the pusher piece 43 of the lock lever 40 is released from the finger after the guide pin 26 contacts the bottom of the notch 31, the coil spring 44 rotates the lock lever 40 into the locked state, and the printed portion 22 is attached to the member. 21 can be securely attached. At this time, the mounting is performed between the platen 20 fixed to the member 21 and the side plate 3 by positioning by the contact between the guide pin 26 and the bottom of the notch 31.
The print head 33 located on the 0 side and the Q gap are maintained with high accuracy.

To remove the printing part 22, press the push piece 4 of the lock lever 40.
This can be easily done by pressing 3 to unlock and then lifting up the entire print group. In this embodiment, the lock pin 2 is inserted between the pair of guide pins 26.
7, it is possible to completely prevent the entire printing group from rotating around each guide pin 26, so that the printing section 22 can be reliably fixed to the mounting member 21. .

Although the above embodiment is an example in which the present invention is applied to a negative bag insertion machine, the present invention is not limited thereto, and can be applied to other terminal devices having printing functions.

〔Effect of the invention〕

As explained above, according to the present invention, the printing section can be detachably attached to the platen side. Moreover, since the platen and print head are positioned by the 4° contact between the guide pin and the side plate, the gap between the platen and the print head can be maintained with high accuracy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the main parts of the printing mechanism of the present invention. FIG. 2 is a perspective view showing a schematic configuration of a negative bag inserter equipped with a printing mechanism. 0 3 8 0 1 2 6 7 0 3 4 - Negative bag, negative film, negative piece, platen, mounting parts, printing section, guide pin, lock bin, side plate, print head, guide shaft 40, lock lever

Claims (1)

[Claims] (1) A guide shaft that slidably supports the print head, a side plate that fixes the guide shaft, a lock lever that has a rotational fulcrum on the side plate, and a mounting member that fixes the platen facing the print head. A printing mechanism comprising: a guide pin provided on the mounting member for positioning the side plate; and a lock pin for locking the lock lever.