Feeding and delivery structure for cutform media in printer

Abstract: A feeding and delivery structure for a cutform medium (4) for use in a printer having a feeder (1) positioned upstream of a platen (5), includes rollers (9, 10) disposed adjacent to the platen (5), a stacker having a curved bottom face member (11) for storing delivered cutform media (4), guide plates (2) positioned adjacent the feeder, and guide members (3) slidingly attached to front faces (2a) of the guide plates (2) for guiding a manually fed cutform medium. The guide members (3) form a surface (3a) of the stacker, and may have ribs (12) formed thereon to decrease the carrying load of the cutform medium (4) after it is conveyed through the rollers.

Description: The present invention relates to a feeding and delivery structure for a cutform medium (e.g., a single sheet or film) for use with a printer having an automatic feeder for cutform media. Document JP-A-2 286 269 shows an adjustable sheet guide for feeding recording media of various sizes to a printer. A switch is included in the feeder to detect when postcard size media are used. Another conventional device, disclosed in Japanese Examined Patent Publication No. 63-53091 and as shown in Fig. 4 of the present application, has a cutform medium fed by an automatic feeder 101 disposed upstream of a platen 105, and conveyed by the platen and pressing rollers 106, 107. The cutform medium is printed by a printing head 108 opposed to the platen 105, delivered upwardly by delivery rollers 109, 110 and stored in a stacker 111. Such a printer is suitable for successive (e.g., continuous) processing of cutform media. However, when a single cutform medium different from those stored in the automatic feeder 101 is to be processed, the processing and handling thereof is troublesome. To eliminate this inconvenience, a sheet passage 112 for manual feeding and a manual feed guide 102 have been provided. However, in the conventional feeding and delivery structure, the manual feed guide 102 for the cutform medium also serves as a rear face of the stacker adapted to store the cutform medium having been printed by the print head 108, and is located on the same plane as the printed cutform medium. Thus, a problem arises in that, if the cutform medium has a tendency to roll-up, a tip 104a of the cutform medium is rolled into the sheet passage 112 due to a rear or trailing end of the cutform medium remaining in the sheet passage. Another problem in the conventional feeding and delivery structure is that the surface of the delivered cutform medium 104 is brought into contact with the rear face of the stacker. Therefore, when the cutform medium is electrostatically charged in a low humidity environment, the attraction of the cutform medium 104 to the stacker face increases. Hence, a comparatively thin cutform medium is buckled due to a force couple generated by the conveying force of the delivery rollers 109, 110 (e.g., indicated by arrow a in Figure 4) and the carrying load on the rear face of the stacker (e.g., as indicated by arrow b), and cannot be properly conveyed by the delivery roller 109. An object of the present invention is to solve the above-mentioned problems of the conventional device, and to provide a feeding and delivery structure for a cutform medium which enables the cutform medium to be safely and reliably delivered without being rolled into a sheet passage, even if it has a tendency to roll-up during its conveyance. This object is solved by the feeding and delivery structure of independent claim 1. Further advantageous features, aspects and details of the structure are evident from the dependent claims, the description and the drawings. Another aspect of the present invention is to provide a feeding and delivery structure for a cutform medium which enables a comparatively thin cutform medium to be delivered reliably. According to the invention, a feeding and delivery structure for a cutform medium in a printer, in which an automatic feeder for cutform media is disposed at a rear portion of a platen, includes delivery rollers disposed at upper portions of the platen, a stacker bottom face member provided at a rear portion of the delivery rollers and forming a stacker for storing delivered cutform media, and guide members slideably attached in the horizontal printing direction to front faces of guide plates provided at the front of the automatic feeder. The guide members guide the side edges and the front face of a manually fed cutform medium and have front faces forming a rear face of the stacker. The guide members may also have ribs formed on their front faces. Fig. 1 is a sectional view of a feeding and delivery structure for a cutform medium according to a first embodiment of the present invention. Fig. 2 is a partial perspective view of the feeding and delivery structure for a cutform medium of the first embodiment of the present invention. Fig. 3 is a sectional view of a second embodiment of the present invention. Fig. 4 is a sectional view of a conventional feeding and delivery structure for a cutform medium. In Figs. 1 and 2, a cutform medium 4 fed by an automatic feeder 1 is conveyed by a platen 5 and pressing rollers 6, 7. Thereafter, the cutform medium 14 is printed by a printing head 8 opposed to the platen 5, passes between delivery rollers 9, 10 located above (e.g., upstream) the platen, and is delivered along front faces 3a of guide members 3 and stored in a stacker formed by a bottom face member 11 and the front faces 3a of the guide members. The bottom face member is secured at one end to a shaft supporting delivery roller 9. The guide members (3) are slideably supported by guide plates 2 as evident from Figure 2 in a direction S perpendicular to the feed direction of the cutform medium 4 in order to allow adjustment to cutform media 4 of different width. The guide members 3 thus provide adjustable opposite U-type channels facing one another for delivering the manually fed cutform medium 4 to the printer. These channels preferably end below and behind the upper end of the bottom face member 11 which together with the free parts of the front faces 3a of the guide members 3 form the stacker for the printed cutform medium 4, as shown in detail in Figure 2. When a cutform medium 4 different from that stored in the automatic feeder 1 is to be printed, the cutform medium 4 is manually fed, with its side edges and its front face being guided by the guide members 3 and front faces 2a of guide plates 2 disposed in front of the automatic feeder 1. The cutform medium 4 is guided to a normal position by guiding its edges. Similarly to when the cutform medium 4 is fed by the automatic feeder 1, it is subsequently carried and conveyed by the platen 5 and the pressing rollers 6, 7. After the cutform medium is printed by the printing head 8, it passes between the delivery rollers 9, 10 located upstream of the platen 5 and is delivered along the front face portions 3a of the guide members. Even if the cutform medium 4 has a tendency to roll up due to its conveyance by the platen 5, since a sheet feed passage is separated from a sheet delivery passage by the guide members 3, an upper end 4a of the delivered cutform medium is prevented from rolling into the sheet feed passage again because of a cutform medium 4 remaining in the sheet feed passage. Thus, the delivered cutform medium can be stored reliably and easily in the stacker formed by the stacker bottom face member 11 and the front face portions 3a of the guide members. Another embodiment of the invention, as shown in Fig. 3, illustrates a feeding and delivery structure for a cutform medium in which ribs 12 are formed on the front faces 3a of the guide members 3. As a result, after the cutform medium 4 passes between the delivery rollers 9, 10, the attraction of the cutform medium 4 carried along the guide members 3 to the stacker face is reduced since the frictional and electrostatic forces created (e.g., in a low humidity environment) are reduced. Thus, even in a low humidity environment, a comparatively thin cutform medium may be employed as compared to that of the conventional system, and a stable sheet feed operation may be performed. According to the feeding and delivery structure for a cutform medium of the present invention, a manual sheet feed passage and a sheet delivery passage of the cutform medium are separated by guide members for guiding the edges and front face of the cutform medium, so that the cutform medium is prevented from rolling into the feed passage during the manual feeding thereof. Furthermore, since the ribs are formed on the front faces of the guide members, a thinner cutform medium can be reliably delivered.

Claims: A feeding and delivery structure for a printer (8) having a platen (5) and having an automatic feeder (1) for cutform media (4) disposed upstream of said platen, said structure, comprising: rollers (9,10) disposed adjacent to said platen (5) for conveying said cutform medium (4); a stacker for storing delivered cutform media, said stacker including a bottom face member (11) disposed downstream of said rollers (9,10); guide plates (2) having front faces (2a) positioned adjacent to said automatic feeder; and guide members (3) that are attached to said guide plate faces (2a), said guide members being slideable in a direction (S) normal to a conveyance direction of said cutform medium (4), said guide members (3) guiding a manually fed cutform medium (4) and having front faces (3a) forming a surface of said stacker, said guide members defining a sheet feed passage and a sheet delivery passage, wherein said guide members (3) separate said sheet feed passage from said sheet delivery passage and thereby prevent a delivered cutform medium from rolling into said sheet feed passage. A feeding and delivery structure for a cutform medium according to claim 1, further comprising ribs (12) formed on said guide members (3). A feeding and delivery structure according to claim 1 or 2 wherein said rollers (9,10) are disposed downstream of said platen (5). A feeding and delivery structure according to one of the preceding claims wherein said rollers comprise delivery rollers (9,10). A feeding and delivery structure according to one of claims 2 to 4, wherein said ribs (12) are formed on said front faces (3a) of said guide members (3) said ribs (12) reducing an attraction of said cutform medium (4) to said stacker after said cutform medium is conveyed by said rollers (9,10). A feeding and delivery structure for a cutform medium according to one of the preceding claims, wherein said bottom face member (11) has an angular shape, said bottom face member (11) being positioned adjacent to said feeder.

Inventors: ISHIDA HIROSHI, ISHIDA, HIROSHI
Applicants: SEIKO EPSON CORP, SEIKO EPSON CORPORATION
Application year: 1991
Main classification: B41J13
IPC codes: B65H11, B65H31, B41J13, B65H1, B65H29